Mitsubishi V17 Training Manual

7/27/2019 Mitsubishi V17 Training Manual

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V17 V17

Projection Television

Technical Training Manual

MITSUBISHI ELECTRICMITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

♦Features ♦Alignments

♦Service Procedures ♦Circuit Descriptions

♦Block Diagrams ♦Troubleshooting

www.mitsubishi-tv.com

V17 V17+ V17++

WS-55807 WS-55857 WS-55907

WS-65807 WS-65857 WS-65907

WT-46807 WS-73907

MODELS

♦ NTSC

♦ 480p♦ 1080i

T 2000

ECHNICAL

RAINING





Projection TelevisionTechnical Training Manual

♦Features ♦Alignments

♦Service Procedures ♦Circuit Descriptions

♦Block Diagrams ♦Troubleshooting

Copyright © 2000 Mitsubishi Digital Electronics America, Inc.

All Rights Reserved

T 2000

ECHNICAL

RAINING

V17 V17+ V17++WS-55807 WS-55857 WS-55907

WS-65807 WS-65857 WS-65907

WT-46807 WS-73907

MODELS

MITSUBISHI ELECTRICMITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.





Table of Contents

Introduction ........................................................................................ I

Chapter 1 - Service Procedures ...................................................... 1-1Disassembly ............................................................................................................................................ 1-3

PCB Functions and Locations ............................................................................................................ 1-10

Self Diagnostics .................................................................................................................................... 1-12

Servicing the Lightbox Assembly ....................................................................................................... 1-13

Chapter 2 - Alignment Procedures ................................................ 2-1Menu Access Codes Quick Reference .................................................................................................. 2-2

Test Equipment and Signals ................................................................................................................. 2-3

Initial Setup ............................................................................................................................................ 2-4

Circuit Adjustment Mode ..................................................................................................................... 2-5Convergence Adjustment Mode ........................................................................................................... 2-7

List of Adjustment Items ...................................................................................................................... 2-9

Chapter 3 - Power Supply............................................................... 3-1Standby Supply Regulator .................................................................................................................... 3-3

Switched Supply Regulator................................................................................................................... 3-6

CRT Filament Supply............................................................................................................................ 3-8

HV Circuit 12V Supply ......................................................................................................................... 3-8

Troubleshooting Tips ............................................................................................................................. 3-9

Chapter 4 - Control Circuit ............................................................ 4-1Overall Control Circuit ......................................................................................................................... 4-3

µPC Operational Requirements ........................................................................................................... 4-4

Input Commands ................................................................................................................................... 4-5

Data Lines............................................................................................................................................... 4-6

Parallel Inputs/Outputs ......................................................................................................................... 4-8

A/V Network / IR Blaster Drive ......................................................................................................... 4-10

Chapter 5 - Video-Color Circuitry.................................................. 5-1Signal Sources and Formats.................................................................................................................. 5-3Overall Block Diagram.......................................................................................................................... 5-4

NTSC Signal ........................................................................................................................................... 5-6

YCbCr Signal ......................................................................................................................................... 5-9

Multi Component Processor ............................................................................................................... 5-13

On Screen Display................................................................................................................................ 5-14

PCB-2HDW .......................................................................................................................................... 5-16

Bitmap Circuitry .................................................................................................................................. 5-17



Chapter 6 - Sync, Deflection and High Voltage ............................ 6-1Overall Block Diagram.......................................................................................................................... 6-3

Sync Block Diagram .............................................................................................................................. 6-4

Deflection Drive ..................................................................................................................................... 6-6

Vertical Deflection .................................................................................................................................. 6-8Horizontal Deflection ............................................................................................................................. 6-8

High Voltage ......................................................................................................................................... 6-10

Chapter 7 - Convergence Circuitry ................................................ 7-1Convergence Signal Path ...................................................................................................................... 7-4

Convergence Output Circuitry............................................................................................................. 7-5

Convergence Control Circuitry ............................................................................................................ 7-7

Chapter 8 - Sound Circuitry ........................................................... 8-1Sound Signal Path.................................................................................................................................. 8-3

Audio Output Amplifier........................................................................................................................ 8-5



Page I

Introduction

Features

• Specifications



Page II



Page III

V17 FeaturesThe V17 Chassis is Mitsubishi’s third generation of

HDTV Upgradeable Projection Televisions. Like pre-

vious generations, it offers the highest analog perfor-

mance available and can be upgraded to a true High-

Definition television. All models and sizes of the V17

chassis have a 16:9 aspect ratio.

Among other high end features, V17 features that are

either new or upgraded include:

• DTV Receiver Inputs

• Component Video Inputs (2 sets)

• VGA Input (V17+, V17++)

• STB Input (V17+, V17++)

• 3rd Generation Diamond Digital Pixel

MultiplierTM

• Motion Adaptive 3D-Y/C Comb Filter

• Multiple Image System with additional 480p and1080i capabilities.

• Film Mode

• Picture Format (5 modes)

• High Speed Velocity Scan Modulation

• Bitmapped Graphics Processor (V17+, V17++)

• System 4 Home Theater Control (V17+, V17++)

The High Definition Interface for the HD-1080 DTV

receiver, that was featured on VZ6, V15 and V16

models, is not included in the V17 line.

The DTV Inputs have the ability to accept High-Defi-

nition Component Video (Y, Pr, Pb) or High-Definition

RGB Video. The RGB Video inputs can have either

Sync on Green or separate H and V Sync inputs. These

inputs can be in the 480i, 480p or 1080i video signal

format. This allows a variety of components to be used

as a SD or HD source.

TheComponent Video inputs offer a high performance

analog interface. These inputs consist of three discrete

connections, Luminance (Y), and the Cr (Pr) and Cb

(Pb) color difference signals. It is the interface of choice

when using a DVD player. Compared to S-Video,

Component Video provides increased color bandwidth,

resulting in sharper color detail and transitions.

Many DVD players are now capable of outputting a

progressive scan format. To accommodate this highperformance output, the V17 chassis DVD Compo-

nent Video inputs can process signals in either the 480p

or 480i format.

The VGA Input allows connection of a PC or digital

set-top box for displaying a standard VGA 640X480

60 Hz image. Note: The VGA capability is meant for

occasional use only. It is not meant to view static or

odd shaped images for extended periods of time. The

PC or digital set-top box must have its screen saver

activated to prevent damage to the CRT phosphors.

Y

G

Pb

B

Pr

R

V

H

HIGH RESOLUTION INPUT

INPUT

3 PIP

S-VIDEO

VGA640X480, 60HZ

COMPONENT 480i/480p

1 (YPrPb) 2 (YPrPb)

DTV (YPrPb/GRBHV)480i/480p /1080i

VIDEO

MONITOR

IR EMITTER HOME THEATER

21STB

OUTPUT

AUDIO-

LEFT/ (MONO)

AUDIO-RIGHT

AUDIO-

LEFT/ (MONO)

AUDIO-RIGHT

ANT-BLOOP OUTANT-A

Figure 1: Back Panel (V17+ and V17++ models)



Page IV

The STB Input on V17+ and V17++ models pro-

vides an additional S-Video Input for a Set Top Box.

Mitsubishi’s 3rd generation Diamond Digital

MultiplierTM enhances analog NTSC, DVD/Compo-

nent, and Standard Definition TV (480i) source mate-

rial through a line doubling process that converts all

480i sources to 480P or 960i (user selectable). Dou-

bling the number of horizontal lines, and the horizontal

scan frequency, results in an image with little or no vis-

ible scan lines. This makes today’s analog program

materials appear smoother and more lifelike. The im-

proved 3rd generation pixel multiplier processes more

data and processes it more quickly than previous gen-

erations, for a sharper, clear picture.

Comb filters separate the luminance and the chromi-

nance from a composite NTSC signal. In order to

provide more precise separations, 3D-Y/C comb fil-

ters store both fields of a complete video frame beforethey begin their processing. Until now, even the best

comb filters did not provide full 3D-Y/C performance

when the TV picture had fast motion because of the 1/

60th of a second time difference between the two pic-

ture fields. The result was 2D-Y/C-grade performance

whenever there was significant motion. Mitsubishi’s new

Motion-Adaptive 3D-Y/C Comb Filter actually com-

pensates for any motion that occurs between fields.

Even programming with bright colors and fast action is

displayed with a new level of clarity.

The Multiple Image System takes advantage of the

V17 Chassis’s 16:9 aspect ratio to display POP (Pic-

ture-Outside-Picture) images in a variety of ways in-

cluding:

• Two pictures side by side.

• The Main picture plus 3 smaller images.

• The Main picture plus 9 smaller images.

Standard PIP displays are also available. The user can

cycle through the Multiple Image System by repeat-

edly pressing the PIP Button until reaching the desired

display.

Note: Although the V17 includes additional 480p and

1080i capabilities, some limitations do still exist. See

Table 1 for details:

DTV Component 1-2

480i-480p-1080i 480i-480p

Ant-A OK1 NO OK OK OK OK NO

Ant-B OK OK1 OK OK OK OK NO

DTV

480i-480p-1080iOK OK OK2 OK OK OK NO

Inputs 1-4 OK OK OK OK2 OK OK NO

Component 1-2

480i-480pOK OK NO OK OK2 OK NO

STB OK OK OK OK OK OK2 NO

VGA NO NO NO NO NO NO NO

Notes: 1 - No POP with sam e Channel

2 - No POP with sam e Input

SUB PICTURE

MAIN

PICTURE

Table 1: PIP/POP Capabilities

STB VGAAnt-A Ant-B Inputs 1-4

Figure 2: Multiple Image System



Page V

The Film Mode is special because movie film has a

frame rate of 24 frames per second, while video is re-

corded at 30 frames per second, with each video frame

made up of 2 fields. This makes transferring movies to

video rather complex. The result is that some video

frames consist of fields from two different film frames.Depending on the amount of motion taking place in the

programming, these video frames can cause the pic-

ture to jitter or flicker. Mitsubishi’s Film Mode detects

these frames and applies motion adaptive technology

to stabilize the picture. The result is a smoother, more

continuous appearance to video that originated from

film.

The Format feature allows the viewer to zoom in on

and/or stretch the raster to optimize the picture size or

shape for the best possible display.

Displaying images of one size on a screen of another

size presents a technical challenge. Mitsubishi provides

5 ways to fit an image to a widescreen, such that the

user can select the mode that results in the most pleas-

ing picture. The five modes are:

1. Standard- For standard widescreen pictures, that

is, pictures with aspect ratios similar to that of the

TV screen such that they fill the screen. Thoseaspect ratios are 1.78:1 (16:9) and 1.85:1. Video

programming with these aspect ratios is often

referred to as “anamorphic.” Many DVD movie

discs are produced this way.

2. Expand- For letterboxed images, that is,

widescreen images that are superimposed on a

4:3 picture. When displayed on a widescreen TV,

these images contain bars on all 4 sides that take

up about 30% of the screen. The Expand mode

expands the image linearly in both height and

width to fill the screen and maintain geometricaccuracy.

3. Zoom- For images that exceed the width of a

widescreen TV. These images, often referred to

as “anamorphic 2.35:1”, when displayed in the

Standard mode, contain bars along the top and

bottom. The Zoom mode linearly expands these

images both horizontally and vertically so that the

black bars are eliminated, a small portion of each

side is cut off, and geometric accuracy is main-

tained.

4. Stretch- For conventional TV programming witha 4:3 aspect ratio. The Stretch mode maintains

geometric linearity in the center and stretches the

extreme left and right sides of the image to fill the

screen. This mode is particularly popular for

programming where most of the viewer’s attention

is drawn to the center of the screen.

5. Narrow- For conventional TV programming with

a 4:3 aspect ratio where geometric linearity is

required through the image. In this mode, the TV

produces vertical bars along the left and right side

such that the remaining area precisely fits theimage’s 4:3 aspect ratio.

Velocity Scan Modulation (VSM) actually slows

down the left-to-right scanning of a CRT when the im-

age is complex and speeds it up when the image is

simple. This allows the sharp transitions from black to

white and from white to black to be precise. The ben-

efit is often described as improved edge definition.

Unfortunately, the transition from standard analog TV

(480i) to progressive scan (480P) and HDTV also cre-ated much faster scan speeds. Ordinary VSM circuitry

couldn’t react quickly enough to provide the benefits it

does at 480i. New for this year, Mitsubishi introduces

HVSM, with the speed and precision to provide en-

hanced edge detail even with progressive scan and

HDTV images.

The Bitmapped Graphics Processor in V17+ and

V17++ models gives 3 dimensional depth to the icons

and text displayed on-screen.

The same models include System 4 Home Theater

Control. This enables the customer to remotely con-

trol home theater components through the special TV

IR repeater system.



Page VI

Model W T-46807 W S -55807 W S -65807 W S -55857 W S -65857 W S -55907 W S -65907 W S -73907

Chassis V17 V17 V17 V17+ V17+ V17++ V17++ V17++

Screen Size 46" 55" 65" 55" 65" 55" 65" 73"

Aspect Ratio 16:9 16:9 16:9 16:9 16:9 16:9 16:9 16:9

Special Control Features

Format 5 Mode 5 Mode 5 Mode 5 Mode 5 Mode 5 Mode 5 Mode 5 Mode

IRIS

Auto brightness/contrast control

Color temperature control

high, mid,

low=6500o

high, mid,

low=6500o

high, mid,

low=6500o

high, mid,

low=6500o

high, mid,

low=6500o

high, mid,

low=6500o

high, mid,

low=6500o

high, mid,

low=6500o

Video/Film Image Type

Digital Convergence 64 point 64 point 64 point 64 point 64 point 64 point 64 point 64 point

V-Chip w/Lock by Time

VIDEO

Detail Enhancements

Comb filter 3D Y/C 3D Y/C 3D Y/C 3D Y/C 3D Y/C 3D Y/C 3D Y/C 3D Y/C

Horizontal Resolution (lines) 1200 1200 1200 1200 1200 1200 1200 1200

Dynamic Beam Forming

Velocity Scan Modulation

Dynamic black level

expansion

3rd Generation Diam ond

Digital Pixel M ultiplier

Optical S ystem CRT size 7" 7" 7" 7" 7" 7" 7" 9"

M ulti -coated Lens system 5 element

Hybrid

5 element

Hybrid

5 element

Hybrid

5 element

Hybrid

5 element

Hybrid

5 element

Hybrid

5 element

Hybrid

6 element

Hybrid

Black Diamond, black m atrix

Lenticular screen

Thin fresnel lens

Screen Pitch (mm ) 0.52 mm 0.52 mm 0.72 mm 0.52 mm 0.72 mm 0.52 mm 0.72 mm 0.72 mm

Front reflective surface mirror

M ulti-step focus

Contrast, Brightness, Room

Viewing

Horizontal Viewing angle 110o 110o 110o 110o 110o 110o 110o 120o

Vertical Vi ewing angle 34o 34o 34o 34o 34o 34o 34o 34o

Contrast ratio - dark Room 50:1 50:1 50:1 50:1 50:1 50:1 50:1 50:1

Contrast ratio - bright room(250 lux)

27:1 27:1 27:1 27:1 27:1 27:1 27:1 27:1

INPUTS

Antenna (RF) inputs 2 2 2 2 2 2 2 2

Front A/V Composite/S-Video 1 1 1 1 1 1 1 1

Rear A/V Composite/S-Video 3 3 3 3 3 3 3 3

Rear STB S-Video - - - 1 1 1 1 1

Component Video inputs

YCrCb 480i 480p 2 sets 2 sets 2 sets 2 sets 2 sets 2 sets 2 sets 2 sets

HDTV Video inputs selectable

RGBHV/YPrPb 480i 480p 1080i 1 set 1 set 1 set 1 set 1 set 1 set 1 set 1 set

VGA inputs 640x480 60HZ - - - 1 set 1 set 1 set 1 set 1 set

OUTPUTS

Cable Loop (RF) output

Monitor A/V output

(fixed/variable audio) 1 1 1 1 1 1 1 1

PIP Audio output

IR blaster port Home Theater 1 1 1 3 3 3 3 3

Active AV Network 1 1 1 Sys 4 Sys 4 Sys 4 Sys 4 Sys 4

GENERAL

Dimensions (approx. in.)

Height 37-13/32 51-9/16 61-7/16 51-9/16 61-7/16 51-9/16 61-7/16 65-3/4

Width 41-9/16 50-9/16 58-7/32 49-7/8 58-7/32 49-7/8 58-7/32 65-3/16

Depth 27-15/16 28-5/16 28 28-5/16 28 28-5/16 28 29-15/16

Height on M atching base 50-13/32 - - - - - - -

Weight (approx. lbs.) 121 250 323 244 322 256 348 405

Table 2: Features and Specfications

V17 Specifications



Page 1-1

Cabinet and Light Box Disassembly Procedures

• Cabinet Separation Procedure

• PCB Functions

• PCB and Major Parts Locations

• Self Diagnostics

• Servicing the Lightbox Assembly

Chapter 1

Service Procedures



Page 1-2



Page 1-3

CABINET DISASSEMBLY (FRONT VIEW)

WT-46807

*Refer to the Parts List for Part Numbers

1a. Front Cabinet Disassembly 1. Remove the Speaker Grille by pulling forward.2. Remove 2 screws (b) to remove the Control Panel.

3. Remove the Board Front by removing 4 screws (a).4. Remove the 4 screws (c) holding the Screen Assembly.5. Lift the Screen Assembly up and away from the cabinet.

Figure 1-1



Page 1-4


WS-55807 / WS-65807


1b. Front Cabinet Disassembly 1. Remove the Speaker Grille by pulling forward.2. Remove the Board Front by removing 4 screws (a).

3. Remove the 5 screws (b) holding the Screen Assembly.4. Lift the Screen Assembly up and away from the cabinet.

Figure 1-2



Page 1-5


WS-55857 / WS-65857


1c. Front Cabinet Disassembly 1. Remove the Speaker Grille by pulling forward.2. Remove 2 screws (a) to remove the Control Panel.

3. Remove the Board Front by removing 4 screws (b).4. Remove the 4 screws (c) holding the Screen Assembly.5. Lift the Screen Assembly up and away from the cabinet.

Figure 1-3



Page 1-6


WS-55907 / WS-65907 / WS-73907


1d. Front Cabinet Disassembly 1. Remove the Cover Front, the two Speaker Grilles and Cover Control by pulling forward.2. Remove 2 screws (a) to remove the Control Panel.

3. Remove the Board Front by removing 4 screws (b).4. Remove the 4 screws (c) holding the Screen Assembly.5. Lift the Screen Assembly up and away from the cabinet.

Figure 1-4



Page 1-7

CABINET DISASSEMBLY (REAR VIEW)

WT-46807*Refer to the Parts List for Part Numbers

2a. Rear Cabinet Disassembly 1. Remove 15 screws (a) holding the Back Board.

2. Remove the 13 screws (b) holding the Back Cover.3. Remove the 3 screws (d) securing each Board Shelf.

3. Remove the 4 screws (c) securing the Light Box Assembly.4. Slide the Light Box out the rear of the Cabinet.

Figure 1-5



Page 1-8

CABINET DISASSEMBLY (REAR VIEW)

WS-55807 / WS-55857 / WS-55907 / WS-65807 / WS-65857 / WS-65907 / WS-73907*Refer to the Parts List for Part Numbers

2b. Rear Cabinet Disassembly1. Remove 12 screws (a) holding the Back Board.2. Remove the 4 screws (c) holding each Board Shelf.

3. Remove the 4 screws (b) securing the Light Box Assembly.4. Slide the Light Box out the rear of the Cabinet.

Figure 1-6



Page 1-9

CABINET SEPARATION PROCEDURE

MODELS: WS-65807, WS-65857, WS-65907, WS-73907The cabinets for the above models are assembled in two pieces. The two pieces may be separated to allow easierdelivery and setup. The following instructions show how to safely separate and re-attach the cabinets.

Note: The guide pins under the cabinet top are prone to breakage if mishandled. Be sure to keep the

cabinet top straight when removing, setting down and re-installing, being careful not to tilt backward or forward on the guide pins.

1) Remove the lower screw from each side of the TV back. On both sides, pull off the two plastic caps, andremove the two exposed screws.

2) Lift the cabinet top straight up until the guide pins clear the holes in the bottom cabinet. DO NOT use the

screen frame when lifting the cabinet top.3) Carefully place the cabinet top onto the floor.

4) When reassembling, set the cabinet top on the bottom. Be sure the guide pins align with the holes in thecabinet bottom. Keep your fingers clear of the edges being joined. Replace the caps and screws that were

removed in step 1.

Step 1

Step 4Step 3

Step 2

Figure 1-7



Page 1-10

PCB Functions and LocationsFigure 1-9 shows the location of all PCBs attached to

the main chassis. The primary functions performed by

each PCB are listed below.

PCB-SIGNAL

NTSC Tuning

• uPC Control

• Video-Color Signal Processing

• Interface for stand-up PCBs.

PCB-3DYC/MD

• NTSC Luminance/Chroma Separation

• NTSC Chrominance Demodulation

• Matrix to Y, Cr, Cb

PCB-TERMINAL

• Audio and Video Inputs

• DTV Inputs

• Audio/Video Switch

• Audio signal processing

PCB-2HDW

• PIP/POP Processing

• Picture Size and Aspect Ratio Control (Format)

• Line Doubling

PCB-BITMAP (V17+, V17++)

• Graphic OSD Generation

PCB-CONV-GEN

• Convergence and Raster Geometry Correction

Signal Generation

• High Voltage Adjustment Generation

• Dynamic Focus Signal Generation• Cross Hatch OSD Generation

PCB-POWER

• Power Supplies

• Convergence Output Amps

• Audio Output Amp

PCB-MAIN

• Vertical Deflection

• Horizontal Deflection

• High Voltage

• Interface for stand up PCBs

PCB-DEFL-JUNGLE

• Horizontal and Vertical Deflection Drive

PCB-DBF

• Corner Focus Correction

Chassis Removal

Refer to Figure 1-9 1) Remove the 3 screws “a”

securing the rear of thechassis.

2) Pull up slightly of the 2front chassis locks “b”.

3) Disconnect all intercon-necting cables.

4) Carefully slide thechassis out the rear ofthe cabinet.



Page 1-11

Figure 1-9: PCB Locations

Figure 1-10: Main Component Locations



Page 1-12

Self DiagnosticsThe V17 Chassis features Self Diagnostics to aid in troubleshooting problems that may cause the set toautomatically turn off or “shut down.” The “Timer/Power ON LED” provides an indication of the sets opera-tion, and the possible cause of a malfunction.

1. Initial Control Circuitry Check Immediately after the TV is connected to an AC power source:

• The LED flashes three times ... indicating the Microprocessor has initialized and is functioningproperly.

• If the LED does not flash ... the Microprocessor is NOT functioning.

2. Error Code Operational Check To activate the Error Code Mode, while the set is OFF, press the front panel “INPUT” and “MENU” buttons

at the same time and hold for 5 seconds. The LED will flash denoting a two digit Error Code.Note: The Front Panel buttons must be used, NOT those on the Remote Control.

• The number of flashes indicates the value of the MSD (tens digit) of the Error Code.

• The flashing then pauses for approximately 1/2 second.

• The LED then flashes indicating the value of the LSD (ones digit) of the Error Code.

• The Error Code is repeated a total of 5 times.

Example: For Error Code is “24”, the LED will flash 2 times, pause, and then flash 4 times.

3. Error Codes The Error Code designations indicating a malfunction, or no malfunction, are listed below:

“12” ... indicates no error has occurred.“21” ... X-Ray Protect circuit.

“22” ... Short Protect circuit.“23” ... Horizontal Deflection failure.“24” ... Vertical Deflection failure.



Page 1-13

Servicing the Lightbox AssemblyLike previous versions of Mitsubishi PTV’s, the V17

chassis uses a lightbox assembly that can be com-

pletely removed from the cabinet for service. As such,

it is fully operational, even if the front control and input

PCBs are not included. However, without these PCBs,

the remote control must be used to enter all commandsand the self diagnostics are not usable.

Servicing the lightbox assembly outside the cabinet is

advantageous for several reasons.

• One person can remove the assembly for return

to the shop.

• The cabinet stays in the customer’s home, avoid-

ing possible damage due to handling.

• Since the room decor is not disturbed, the cus-

tomer is less likely to have objections.

• PCB’s are far easier to access for troubleshoot-ing purposes. See Figures 1-11 and 1-12.

Lightbox service can be simplified by placing the as-

sembly sideways on a mobile cart. See Figure 1-11.

Figure 1-11: Lightbox placed on cart with

crosshatch patten displayed.

Note: Since the HV Block is mounted outside

the lightbox on the V17 Chassis, place the as-

sembly on the cart with the HV side up.

Once the chassis is operational, position the assembly

so the face of the lenses are perpendicular to a wall,

about 3 to 4 feet back. With a signal applied or a menuselected, a reasonably good picture can be obtained

by moving the assembly back and forth from the wall

to obtain the best focus, then rotating the cart left to

right slightly to obtain the best raster geometry. See

Figure 1-12.

Note: Adjustments such as focus, convergence

and raster geometry should not be performed

while the lightbox is removed from the cabinet.

After repair, reassemble the set before perform-

ing final alignments. Be aware that defects that

only cause the picture to be slightly degraded

may not lend themselves to troubleshooting with

the lightbox removed.

Figure 1-12: MENU display.

Notice easy access to bottom of chassis.



Page 1-14



Page 2-1

Menu Access Codes

• Test Equipment and Signals

• Option Menu and Initial Setup

• Circuit Adjustment Mode

• Convergence Adjustment Mode

• List of Adjustment Items.

Chapter 2

Alignment Procedures



Page 2-2

ADJUSTMENT MENU ACCESS CODES

QUICK REFERENCE

Chassis

Type Option Me nu Adjustm ent Mode Conve rge nce Mode

VZ6 / V15 MENU-1-3-7-0 MENU-2-3-5-7 MENU-2-3-5-9

V16N / V16W MENU-1-2-7-0 MENU-1-2-5-7 MENU-1-2-5-9

V17 / + /++ MENU-8-2-7-0 MENU-8-2-5-7 MENU-8-2-5-9

Menu Type

Table 2-1

Adjustment Menu Access Codes



Page 2-3

ELECTRICAL ADJUSTMENTS

Note: Perform only the adjustments required.

Do not attempt an alignment if proper equipment is not available.

1. Test Equipment Oscilloscope (Unless otherwise specified, use 10:1 probes)

• Signal Generator (both SD and HD capable)• Frequency Counter

• Direct Current Voltmeter• Direct Current Power Supply

• Multiplex Audio Signal Generator• Direct Current Ampere Meter

2. Test Signals

A. Monoscope Signal

When called for, use the NTSC or HD 1080i

monoscope signal shown.NOTE: HD 1080i signal source can be RGBHV,

YPrPb or RGB (Sync on Green). Be sure tospecfy the source type in the customer menu.MENU>SETUP>INPUT ASSIGNMENT>DTV>

(YPrPb or RGB)

B. Color Bar Signal

Use the color bar signal shown,

unless specified otherwise.

1H

40%

40%

100%

75%



Page 2-4

B. Default Settings

Memorize Channels ANT A Input ANT A SD Video Format 480P

Language English Channel 3 Video Mute On

Memory Deleted Black Level Expansion On

Clock Setting Auto Name N/A

Time Zone Eastern SQV N/A Volume 30%

Daylight Savings Applies Bass 50%

Clock Time N/A Timer Off Treble 50%

Set Day N/A Set Time 12:00PM Balance 50%

Set Day Everyday Surround Off

AV Network OFF Input ANT A Listen to Stereo

External Audio System NO Channel 3

AV Receiver at Input 1 None Level Sound Off

Audio Output Variable TV Rating Off

FV-Fantasy Violence N/A Iris Off

Antenna A On D-Sexual Dialog N/A Contrast 100%

Antenna B On L-Adult Language N/A Brightness 50%

DTV YPrPb S-Sexual Situation N/A Sharpness 50%Input 1 Input-1 V-Violence N/A Color 50%

Input 2 Input-2 Program not Rated N/A Tint 50%

Input 3 Input-3 Movie Rating N/A Color Temp. High

Input 4 Input-4 Video Noise Reduction

Component 1 Comp. 1 V-Chip Start Time N/A PIP/POP

component 2 Comp. 2 V-Chip Stop Time N/A Source Ant A Ch 3

Lock by Time Off PIP Position Lower Right

Closed Captions With Mute Lock Time N/A POP Position Right Half

CC Background Gray Unlock Time N/A Format Standard

PIP/POP Format Dble. Window

CAPTIONS

CHANNEL EDIT

TIMER

V-CHIP PARENT LOCK

V-CHIP LOCK BY TIME

SETUP

CLOCK

AV CONNECTION

INPUT ASSIGNMENT

AUDIO SETTINGS

VIDEO SETTINGS

MAIN MENU DEFAULT SETTINGS

ADVANCED FEATURES

3. Initial SetupA. Option Menu Setup Follow the steps below for the initial set-up:

1. Select the "MENU" display by pressing the "MENU" button once.2. Press the number buttons "8", "2", "7", "0" in sequence to

select the "OPTION MENU" display.3. Press the "ADJUST" button to select "INITIAL."

4. Press "ENTER."NOTE: At this time channel 3 is automatically selected.

(MENU-8-2-7-0)

OPTION MENU

Initial

Power restore :OFF

DTV Port :Auto



Page 2-5

A/V Memory ANT-A/B DTV INPUTS 1-4 DVD-1/2

Iris

Contrast Max. Max. Max. Max.

Brightness Center Center Center Center

Auto Picture

Sharpness Center Center Center Center

Color Center Center Center Center

Tint Center Center Center Center

Color Temp. High High High High

Video Noise Normal Normal Normal NormalBass Center Center Center Center

Treble Center Center Center Center

Balance

Surround OFF OFF OFF OFFListen To

Level Sound OFF OFF OFF OFFStereo

A/V RESET DEFAULT SETTINGS (By Input)

OFF

OFF

Center

C. A/V Memory Each of the external inputs has its’ own Audio/Video Memory. A change in an A/V setting at a specific inputis stored in memory for that specific input.

A/V Reset1. The front panel AV Reset button intializes all A/V Memories.

2. The AV Reset in the user’s menu initializes only the selected input’s A/V Memory.

4. Circuit Adjustment ModeA. Activating the Circuit Adjustment Mode The current signal source determines if the

activated Adjustment Mode is NTSC or HD.

1. Select the signal source (NTSC or HD).2. Press the "MENU" button on a remote hand unit.

3. Press the number buttons "8", "2", "5", "7" in sequence.The screen will change to the Adjustment Mode.

Note: Repeat steps 1 and 2 if the circuitadjustment mode does not appear

on screen.



Page 2-6

B. Selection of Adjustment Functions and

Adjustment Items

To select an adjustment item in the circuit adjustment mode,

first select the adjustment function that includes the specificadjustment item to be selected. Then select the adjustment

item.

(Refer to the following pages for the listing of adjustmentfunctions and adjustment items.)

1. Press the "AUDIO" button on a remote hand unit to select

an adjustment function. Each time the buttonis pressed, the Function changes in the following sequence:

2. Press the “VIDEO” button to select a specific Adjustment Item. The Item number increases each timethe “VIDEO” button is pressed.

C. Changing Data

After selecting an adjustment Item, use the “ADJUST UP/DOWN” buttons to change data.• Press “ADJUST DOWN” to decrease the data value.

• Press “ADJUST UP” to increase the data value.

D. Saving Adjustment Data

Press “ENTER” to save adjustment data in memory. The character display turns red for approximatelyone second in this step.

Note: If the circuit adjustment mode is terminated without pressing “ENTER”, changes in adjustmentdata are not saved.

E. Terminating the Circuit Adjustment Mode

On the remote hand unit, press the “MENU” button twice or the “HOME” key once to terminate theadjustment mode.

Note: The circuit adjustment mode can also be terminated by turning power OFF.

F. Toggle Between Reception Modes

Pressing “3” when in the Adjustment Mode toggles between NTSC, HD, 480P and VGA. However datachanges are not automatically saved. Press “ENTER” to save data before pressing “3”.

START Video

Chroma

Defl

Jungle

Main

Matrix

HR Iris AudioSub

Matrix

Adjustment Functions



Page 2-7

5. Convergence Adjustment ModeThe Convergence mode is used to perform raster geometry correction, and convergence adjustments.

These adjustments must be made in both the SD (NTSC) and HD modes.

A. Convergence Mode Activation 1. Press MENU-8-2-5-9

2. When the Convergence Mode is activated, thedisplay on the right appears on a Green Crosshatch.

B. Selecting the HD or SD Mode 1. Select the Signal Source before entering the Convergence Mode, either an NTSC or HD source.

2. Enter the Convergence Mode

If the signal source is NTSC, the SD mode is activated.

• If the signal source is HD 1080i, the HD mode is activated.

3. Activating the HD mode when no HD signal is available

• Activate the Factory Option Menu (MENU-8-2-7-0)• Use the “Adjust” keys to select “DTV Port” and press the “Enter” key three times to change the

setting to “1080i”. Sequence = “AUTO”-”480i”-”480p”-”1080i.” Note: Ignore any loss of sync

while changing modes.

• Exit the Option Menu (Press MENU twice or HOME once)

• Select the DTV Inputs as the signal source (INPUT button)

• Activate the Convergence Mode ... the Convergence mode will be in the HD mode and the

internal crosshatch is displayed.

4. After adjusting Convergence, be sure to set the DTV Port back to AUTO.

• Select an analog Input as the signal source (INPUT button)

• Activate the Factory Option Menu (MENU-8-2-7-0)

• Use the “Adjust” keys to select “DTV Port” and press the “Enter” key once to change the setting

from “1080i” to “AUTO”.

• Exit the Option Menu (Press MENU twice or HOME once)

C. Convergence Mode Functions In the Convergence Mode there are three main Functions (Categories).

• Pressing “6” activates CONV MISC

• Pressing “5” activates COARSE CONV

• Pressing “4” activates FINE CONV

D. CONV MISC (Press 6)

This mode is used to preset data values controlling the Convergence Generator, and to perform the HVRegulation adjustment.

1. Use the VIDEO button to select an item.

2. Use the ADJUST buttons to change data.

NOTE: When Item “0 HVOL” is selected the screen goes black except for the data display. This occurssince a black screen is required when making the HV Regulation adjustment.



Page 2-8

E. COARSE CONV (Press 5) There are four Sub Functions in the Coarse mode, COARSE GREEN, COARSE RED, COARSE BLUE

and DF.

• COARSE GREEN .... used to make Coarse Raster Geometry Adjustments.

• COARSE RED ... used to make Coarse Red Convergence Adjustments.

• COARSE BLUE ... used to make Coarse Blue Convergence Adjustments.

• DF ... used to preset data values controlling the Dynamic Beam Focus circuit drive signal.

1. Use AUDIO button to select a Sub Function

2. Use the VIDEO button to select an Adjustment Item.3. Use the ADJUST buttons to change data.

F. FINE CONV (Press 4) Sub Functions

This mode is used to perform Fine Raster Correction, and Fine Red and Blue Convergence Adjustments.There are three Sub Adjustment Functions, selected with the AUDIO button:

• FINE GREEN .... a Green Crosshatch is displayed, to make Fine Raster Corrections.

• FINE RED .... a White Crosshatch is displayed, to make Fine Red Convergence Adjustments.

• FINE BLUE .... a White Crosshatch is displayed, to make Fine Blue Convergence Adjustments.

Cursor

In the Fine mode a Cursor is added tothe Crosshatch. The ENTER button

toggles the Cursor between twomodes:

• MOVE (blinking Cursor) ....

use the ADJUST buttons toselect any of 64 points on the

Crosshatch.

• ADJUST (Non blinking

Cursor) .... the ADJUST

buttons adjust the activecolor at the current Cursorposition, horizontally or

vertically.

Cursor CoordinatesSpecific intersections in the Cross-

hatch are assigned vertical andhorizontal coodinates. These are shown in the adjacent diagram. The Cursor can only be moved tothose positions that have coordinates assigned. If the Cursor is at coordinates outside the screen area,

the Cursor will not be visible. Use the ADJUST buttons to move the Cursor to an intersection on thescreen.

DisplayThe on-screen display changes in the Fine mode, as shown atthe right. The display shows the vertical and horizontal datafor the current Cursor Position, and the horizontal and vertical

coordinates for that position.

G. Saving Data and Exiting the Convergence Mode Press “MENU” twice or “HOME” once to exit the Convergence mode, data is automatically saved.

123 H1 V1 234

HORIZ HORIZ VERT VERT

DATA COORD COORD DATA

SD FINE GREEN

DIGIT DESIGNATION



Page 2-9

E2PROM ReplacementIC7C01 and IC7C02 store the adjustment data. After replacing the IC, set the data to the values given in thefollowing tables. If good performance is not obtained, perform the Adjustments Procedures given in the

Notes column.

List of Adjustment Items.

DEFL JUNGLE Function IC4A01

Function Display Adjustment Data 46" Only 55/65/73" Notes

Item # Abbrev. Description Range HD NTSC HD NTSC

1 HWID Horizontal Width 0~63 38 44 33 29 Width

(73 inch Only) 47 57

2 HKEY Horizontal Keystone 0~63 30 25 31 31 Preset

3 EWPT EW-PCC on top 0~63 31 25 26 31 "

5 EWPB EW-PCC on bottom 0~63 27 20 26 20 "

7 VHGT Vertical Height 0~63 21 31 31 38 Height

*8 VLIN Vertical Linearity 0~15 0 0 9 9 Preset

9 VSCN Vertical S-Correction 0~15 7 7 0 0 "

20 VPOS Vertical Position 0~63 0 63 31 31 "

73" Only

VIDEO / CHROMA Function IC2V00

Function Display Adjustment Data Initial Data Notes

Item # Abbrev. Description Range NTSC HD 480P VGA

1 SCT Picture Gain Control 0~63 42 ← ← ← Sub Contrast

2 SBRT Sub Brightness 0~63 18 ← ← ← Black Level

3 SCOL Sub Color 0~15 2 2 2 2 Preset

4 STIN Sub Tint 0~15 7 7 7 7 "

5 SCON Sub Contrast 0~15 2 2 2 2 "

6 RDRH R-Drive (high) 0~63 42 42 ← ← White Balance

7 GDR G-Drive 0~63 50 50 ← ← Preset

8 BDRH B-Drive (high) 0~63 42 42 ← ← White Balance

9 CTRH R-Cutoff (high) 0~63 15 15 ← ← "

10 CTGH G-Cutoff (high) 0~63 50 50 ← ← Preset11 CTBH B-Cutoff (high) 0~63 15 15 ← ← White Balance

12 RDRL R-Drive (low) 0~63 50 ← ← ← "

13 BDRL B-Drive (low) 0~63 25 ← ← ← "

14 CTRL R-Cutoff (low) 0~63 23 ← ← ← "

15 CTGL G-Cutoff (low) 0~63 50 ← ← ← "

16 CTBL B-Cutoff (low) 0~63 10 ← ← ← "

17 GMMA Gamma control 0~15 8 4 5 5 Preset

18 BRT Brightness control 0~63 31 ← ← ← User

19 COL Color Gain control 0~63 28 ← ← ← User

(73" only) 27

21 CONT Picture Gain control 0~63 42 ← ← ← Preset

56 CRO1 CR Offset 1 0~15 9 9 9 9 Cb Cr Offset57 CBO1 CB Offset 1 0~15 10 10 10 10 Cb Cr Offset

( ) Automatically goes to the value on the left

Indicates 73" Only



Page 2-10

AUDIO Function IC3A01

Function Display Adjustment Data Initial Notes

Item # Abbrev. Description Range Data

1 INP Input Level Alignment 0~15 8 Input Level

3 WDE Wideband Separator Align. 0~31 3 Separation

4 SPC Spectral Separator Align. 0~31 3 "

HR FunctionItem

Number

Abbrev.

NameDescription Data

1 HR Display horiz. Centering (NTSC) 128

2 HRHD Display horiz. Centering (HD) 128

MAIN MATRIX Function IC6M00



1 TNTM Main Tint 0~63 30 Preset

2 COLM Main Color 0~63 19 "

3 YDRM Main Gain Control 0~31 12 Main Y Level

DYNAMIC FOCUS MENU-8-2-5-9

Item

Number

Abbrev.

NameDescription

Data

SD&HD0 DFH Dynamic Focus Horizontal 175

1 DFV Dynamic Focus Vertical 100

IRIS Function

Function Display Adjustment Data Initial NotesItem # Abbrev. Description Range Data

1 0T1 Lower thresh hold voltage setting 0-255 60 Preset

SUB MATRIX Function IC6P00



1 TNTS Sub Tint 0~63 30 Sub Picture Tint

2 COLS Sub Color 0~63 30 Sub Color

3 YDRS Sub Gain Control 0~31 12 Sub Y Level

4 VPDS Sub-V Pedestal DC Control 0~15 7 Preset

5 UPDS Sub-U Pedestal DC Control 0~15 7 "



Page 2-11

CONV MISC Items (MENU-8-2-5-9-6)

Item Abbrev. Description Data Notes

Number Name SD HD

0 HVOL High Voltage Control HV Adj.

3 STLN Horiz. Correction Start Line Number 55 81 Preset

4 FPHS Fine H-Phase of Correction Signal 200 200 "

7 TPHS Test Pattern H-Phase 70 70 "

* Do not change "0 HVOL" if it has been previously set.

128

CONV GREEN Items (MENU-8-2-5-9-5)

Item Abbrev. Description Notes

Number Name 46" 55-65-73"

0 HSTA* Horizontal Position -35/-35 -35/-35 Centering

1 SPCC Side Pincushion Correction 0/0 0/0 Geo. (Conv)

2 HW ID W idth 0/0 0/0 Geo. (Conv)

(0/+30)73"

3 SKEW Skew (Y axis rotation) 0/0 0/0 Geo. (Conv)

4 VSTA* Vertical Position -35/-35 -35/-35 Centering

5 VKEY Vertical Keystone Correction 0/0 0/0 Geo. (Conv)

6 TBPC Top/Bottom Pincushion Correction -220/-200 -220/-200 Geo. (Conv)

7 TILT Horizontal Tilt (X axis rotation) 0/0 0/0 Geo. (Conv)

*HSTA and VSTA must not ex ceed ±200

CONV RED Items (MENU-8-2-5-9-5)



0 HSTA* Horizontal Position +75/+75 +40/+50 Static Conv.

1 HLIN Horiz. Linearity -225/-210 -210/-200 Coarse Conv.

2 SKEW Skew (Y axis rotation) +5/+5 +10/+10 Coarse Conv.

3 HW ID W idth +15/+20 -25/-5 Coarse Conv.

4 HSBW Horiz. Side Bow Correction +30/+30 +30/+30 Coarse Conv.

5 VST* Vertical Position -20/-20 -20/-20 Static Conv.

6 VKEY Vertical Keystone Correction -115/-85 -100/-85 Coarse Conv.

7 TILT Horizontal Tilt (X axis rotation) 0/0 0/0 Coarse Conv.


CONV BLUE Items (MENU-8-2-5-9-5)



0 HSTA* Horizontal Position -75/-75 -40/-40 Static Conv.

1 HLIN Horiz. Linearity +240/+215 +240/+220 Coarse Conv.

2 SKEW Skew (Y axis rotation) 0/0 -10/-10 Coarse Conv.

3 HW ID W idth -15/-20 -20/-5 Coarse Conv.

4 HSBW Horiz. Side Bow Correction -45/-45 -45/-45 Coarse Conv.

5 VST* Vertical Position -5/-5 -10/-10 Static Conv.

6 VKEY Vertical Keystone Correction +115/+105 +115/+115 Coarse Conv.

7 TILT Horizontal Tilt (X axis rotation) 0/0 0/0 Coarse Conv.


Data (SD/HD)

Data )SD/HD)

Data )SD/HD)



Page 2-12



Page 3-1

Basic Block Diagram• Standby Supply Regulator

• Standby Supplies Power Distribution

• Switched Supply Regulator

• Switched Supplies Power Distribution

• CRT Filament Supply

• HV 12 Volt Supply

• Troubleshooting Tips

Chapter 3

Power Supply



Page 3-2



Page 3-3

A Basic Block Diagram of the Power Supply circuitry

in the V17 chassis is shown above. It is comprised of

two Switch Mode Regulators, one for Standby Sup-

plies and one for Switched Supplies. A single Bridge

Rectifier supplies power to the two Switch Mode

supplies.

Since the Bridge Rectifier connects directly to the

AC line, the primary circuits of both Regulators arereferenced to a Hot Ground. An isolation trans-

former must be used when servicing these circuits.

IC9A20 is the Standby Supply Regulator and is ac-

tive as long as the set is connected to an AC source.

It generates the Standby 12 Volt and Standby 5 Volt

supplies. IC9A20 also generates the initial startup

voltage for IC9A50, the Switched Supplies Regula-

tor.

When the set is switched On, the On/Off circuit di-

rects startup voltage to IC9A50 activating the

Switched Supply Regulator. The On/Off circuitry

also activates the Switched 12 Volt supply, which is

derived from the Standby 12 Volt supply.

When activated, IC9A50 generates seven Switched

Supplies:

220 Volts

• Audio Output Supply (18 Volts)

• Positive and negative 24 Volt supplies

• SW 5 Volts

• 110 Volts

• 32 Volts

Power Supply



Page 3-4

Standby Supply RegulatorFigure 3-1 illustrates the Standby Switch Mode Regu-

lator circuitry. Its’ operation is basically the same as

those used in earlier models. The internal FET is

supplied DC voltage (170V) from D9A01 through

the primary winding of T9A20.

Startup

Startup voltage is derived from the rectified voltage

at one of the AC inputs to D9A01, and directed

through R9A22 to pin 4 of IC9A20. Oscillation starts

at approximately 16VDC. The voltage at pin 4 willstart to drop due to the increased current drain. If the

voltage drops below 11 volts the oscillator shuts

down. To prevent this, the signal induced in the sec-

ondary winding at pin 2 of T9A20 is rectified and

added to the voltage at pin 4 of the IC.

The signal from pin 2 of the transformer serves two

additional purposes:1) It provides feedback to pin 5 of IC9A20, to

stabilize the oscillators operation.

2) Is rectified by D9A27, providing the startup

voltage source for the Switched Regulator.

Regulation

Monitoring the STBY 5V secondary supply provides

feedback for regulation. It is compared to a refer-

ence in IC9A21, and a correction voltage is gener-

ated at the (K) output. The correction voltage con-

trols the conduction of Photo Coupler PC9A20 which

determines the amount of feedback to pin 5 of

IC9A20.

Over Current and Voltage Protection

Pins 4 and 5 of IC9A20 are dual purpose inputs. Pin

4 is the VIN and OVP (Over Voltage Protection) in-

put. If the voltage at pin 4 exceeds 20.5 volts the

oscillator shuts down.



Page 3-5

Pin 5 is both the feedback and OCP (Over Current

Protection) input. The ground return for the internal

FET is through R9A27 at pin 2 of the IC. The volt-

age across R9A27 is proportional to the FET’s cur-

rent. A sample of this voltage is feed to pin 5 through

R9A26. If the voltage at pin 5 is excessive, the oscil-

lator is automatically shut down.

Standby Supplies

The Standby Supplies are generated at the remaining

secondary windings of T9A20. The signal from pin

13 of T9A20 is rectified by D9A33 producing the

STBY 5V supply. The signal from pin 12 is rectified

generating the STBY 12V supply. All other Standby

supplies are derived from these two supplies.

AC OFF

The signal from pin 12 is also rectified by D9A31producing a –12 Volts. The negative 12 volts holds

Q9A22 on which holds the AC-OFF line negative. If

power is lost, the loss of –12 Volts turns Q9A22 Off,

allowing the AC-OFF line to go High, informing the

µPC that power has been lost.

Current Limiting

The current limiting resistor, R9A02, is in series with

the AC line to D9A01. When the set is switched On,

the P-ON command turns On Q9A51, energizing re-

lay K9A50 and shorting out the current limiting re-

sistor.

Standby Supplies Power DistributionFigure 3-2 illustrates the Standby Supplies Power Dis-

tribution. The Standby 12 Volts supplies power for

the Horizontal Drive circuitry, On/Off circuit and

through IC9C03 provides 9 volts for the Antenna

Relay.

The Standby 5 Volt supplies power to the Control

circuitry, Remote Preamp and is the source for the

Switched 5 Volt Supply. It also provides 3.3 Volts,

through IC7C06, to the Control circuitry. In the V17+and V17++ chassis it provides power for Preamp 2,

and to IC7C07, a 3.3 Volt Regulator supplying power

to the Bitmap circuitry.



Page 3-6

Switched Supply RegulatorThe Switched Supply Regulator, IC9A50, is shown

in Figure 3-3. Although it is a different generic type

IC, and its’ pin number designations differ, the basic

operation is similar to the Standby Regulator.

1) 170 VDC is applied to the internal FET

through the primary winding of T9A50.

2) Startup voltage is applied to pin 4, which isalso the OVP input.

3) The Feedback and OCP input is at pin 1.

4) The 110V supply is monitored to provide

regulation feedback.

5) The FET ground return is through R9A55

and R9A54 at pin 2 of the IC.

The Start, Shut Down and OVP voltages at pin 4 are

the same as those for IC9A20.

On/Off Circuitry

The On/Off circuitry does differ from that in previ-

ous models. The Startup voltage source is from

D9A27 in the Standby Regulator circuit, refer to Fig-

ure 3-1. It is applied to pin 4 of PC9A50 and the

collector of Q9A50.

When the set is switched On, the P-ON line from the

Control circuitry goes High, driving Q9A51 into con-duction. The initial conduction of Q9A51 starts the

turn On sequence:

1) Activating K9A50, shorting out the current

limiting resistor to the Bridge Rectifier.

2) Pulls pin 2 of PC9A50 Low, lighting the

LED and driving the Photo Transistor into

conduction.



Page 3-7

3) The Photo Transistor drives the base of

Q9A50 positive, turning the transistor On

and supplying startup voltage to pin 4 of

IC9A50.

4) Rectification of the signal at pin 3 of T9A50

adds to the startup voltage at the collector

of Q9A50, maintaining oscillation.

Switched Supplies

Five Switched Supplies are generated at the second-

ary windings of T9A50, 220V, Audio (18V) Supply,

positive and negative 24 Volts, and 110 Volts. A 32

Volt supply is also generated from the 110 Volt sup-

ply.

When the SW +24V is generated it is applied to the

gates of two FETs, Q9A23 and Q9A20, turning On

both FETs. Q9A23 supplies the SW 5V supply, from

the STBY 5V supply, and Q9A20 outputs the SW

12V supply from the STBY 12V supply.

Switched Supplies Power

DistributionFigure 3-4 illustrates the Switched Supplies Power

Distribution. Note that there are four additional regu-lators (five in the V17+ and V17++ chassis).

• IC9C02 provides a 3.3 Volts for the

2HDW circuitry.

• IC9C05 provides 9 Volts for the Sub

Decoder, 3DYC, Signal Switch, MCP and

RGB circuitry.

• IC9C01 generates 9 Volts for the Tuners,

A/V Switch and MCS circuitry.

• Q5A08 supplies 12 volts to the HV Drive

Circuitry.

• IC7C06 provides 3.3 Volts for the Bitmapcircuitry (V17+ and V17++ only).



Page 3-8

CRT Filament SupplyThe CRT Filament supply is not generated by either

Switch Mode Regulator. It is generated in the collec-

tor circuit of the Horizontal Output transistor, Q5A31,

as shown in Figure 3-5. The horizontal drive signal

induced in the secondary winding of T5A31 is recti-

fied by D5A33, and regulated by Q5A36, using

IC5A05 as the reference.

HV Circuit 12 Volt SupplyIt was stated that the 12 Volt supply for the HV Drive

circuitry (IC5A00) was derived from the +24 Volt

supply. Figure 3-6 shows this circuit in more detail.

The 10 Volt reference for the circuit is derived from

the Protect circuitry. A comparator in IC5A01 com-

pares a sample of the voltage from the emitter of

Q5A08 to the reference. The output of the com-

parator controls the conduction of Q5A08 to main-

tain a constant 12 volts.

Note that the 12 Volts supply is routed through the

DK (HV Block) connector to pin 9 of IC5A00. This

removes HV drive if the DK connector is unplugged,protecting the circuitry from excess HV.

If the 24 Volt supply is lost, the immediate symptom

is no HV. The 24 Volt supply also supplies power for

the Vertical and Convergence Output ICs. A defect

in either of these circuits can blow the 24V Supply

fuse, F9A04, and the symptom appears as no HV.

Before spending time troubleshooting a no HV prob-

lem, we suggest checking the 24 Volt supply to make

sure it is not a Vertical or Convergence Problem.



Page 3-9

Troubleshooting TipsTroubleshooting the Switching Mode Regulators in

the V17 is similar to that in previous models.

Dead Regulator

1) Check for DC (170V) at Drain pin of the

IC.

2) Check for Startup voltage at the VIN input

of the IC, it takes 16 Volts to start the

oscillator.

Dead Regulator (may have a Clicking Sound)

OVP may have shut down the oscillator. When this

occurs, the oscillator will not start again until the volt-

age at the OVP input drops below 6 Volts. This usu-

ally occurs in just a few seconds.

Before condemning the IC, measure the voltage atthe OVP input, if it is 6 Volts or higher, try resetting

the circuit.

To reset the circuitry:

1) Remove AC power from the set.

2) Use a 100 Ohm resistor to discharge the

capacitor at the VIN input. C9A23 for

IC9A20, and C9A51 for IC9A50.

3) Reconnect the AC power, the problem may

be solved.

Regulator Cycles On and Off

1) Additional DC voltage to maintain oscilla-

tion may be missing.

2) Check the additional DC source, D9A22 for

IC9A20 and D9A54 for IC9A50.

No Regulator Output and a Chirping Sound

1) Usually indicates excessive load.

2) Check each of the secondary supplies for

excessive current drain (the 110V supplyload is the most likely cause).

To help isolate the problem, a 60W lamp can be used

to replace the 110V load.



Page 3-10



Page 4-1

Overall Block Diagram

• Basic µPC Requirements

• Input Commands

• SDA5 Data Line Path

• CSDA / SDA3 / 3 Line System

• µPC Parallel Inputs

• µPC Parallel Outputs• A/V Network / IR Blaster Drive

Chapter 4

Control Circuitry



Page 4-2



Page 4-3

Figure 4-1 illustrates an Overall Block Diagram of

the Control Circuitry. The circuitry consists mainly

of a µPC, two E2PROMs and a Port Expander. User

commands, from the front panel buttons or the re-

mote are input to the µPC.

The µPC controls the TV using four I2C bidirectionaldata lines, and one three line system using conven-

tional data lines.

The main functions of the I2C lines are:

E2SDA … writes and reads data to and from the

E2PROMs, mainly user programmed data and ser-

vice adjustment data.

SDA5 … Controls most of the TV’s operation, the

Port Expander, Tuners, Main Decoder, Sub Decoder,

Multi Channel Sound (MCS), Y Signal Enhancement,

Multi Component Processor and the A/V Switch cir-

cuits.

CSDA … Controls the Convergence circuitry andperforms HV Regulation Adjustment.

SDA3 … Controls the 2HDW (2H Double Window)

line doubling and POP/PIP circuitry.

Of course a Serial Clock line is generated for each

I2C Data line to time data transfer.

Control Circuitry



Page 4-4

The three line directional system consists of:

• D-OUT … transfers µPC data to the con-

trolled circuits.

• D-IN … returns data from the controlled

circuits to the µPC.

• CLK … times the transfer of data on the D-

OUT and D-IN lines.

The D-OUT line controls Timing in the 2HDW cir-

cuit, and in the V17+ and V17++ chassis, controls

the Bitmap circuitry.

The Port Expander, is controlled by SDA5 and out-

puts eight SW (Switch) signals. These signals are

used to select Y, Cb and Cr signals for the main and

sub (PIP) pictures. Table 4-1 lists the function of

each SW signal from the Port Expander.

µPC Operational RequirementsThe Basic Operational Requirements for the µPC are

a 3.3 Volt DC supply, a Timing Signal, Ground Re-

turns for the internal circuitry and a method of Re-

setting the µPC. Figure 4-2 shows how the require-

ments are met in the V17 chassis.

DC Supply … a Standby 3.3 Volt supply is gener-

ated by IC7C07 and applied to pins 7, 32 and 77 of

the µPC.

Timing Signal … generated by the Crystal Controlled

4 mHz Clock Oscillator at pins 75 and 76 of the µPC.

Ground Returns … pins 37 and 74 of the µPC sup-

ply ground returns.

Reset … provided by the Watch Dog IC, IC7C08.

The IC serves two purposes:

1) When power is initially applied to the TV

C7C40 delays the High applied the Resetinput of the µPC, pin 5. This sets the µPC

to its’ nominal starting point, preventing

computer lock up.

Control

Signal

Origin

(IC7C05)IC

Control

Pins

Selects

Main/SubFrom

SW 1 Pin 9 IC2Y08 9,10,11 Main(1H) Main Decoder / (DVD/DTV)

SW2 Pin 10 IC2Y10 " Sub(1H) SUB Decoder / (DV/DTV)

SW3 Pin 11 IC2Y04 " BMP Bit Map Circuit (V17+/V17++ Only)

SW4 Pin 12 IC2Y06 " Sub(1H) DVD / DTV

SW5 Pin 13 IC2X08 " Main(2H) 2HDW / (DTV/DVD)]

SW6 Pin 14 IC2Y02 " Sub(1H) DVD-1 / DVD-2

SW7 Pin 15 IC2Y07 " Main Sync NTSC / (DVD/DTV)

SW8 Pin 16 IC2Y09 " Sub Sync NTSC / (DVD/DTV)

Table 4- 1: Y, Cb, Cr Signal Select Control



Page 4-5

2) Automatically resets the µPC if lock up

occurs during operation. When the µPC is

functioning properly, pulses from AMDP-

CS output keep resetting IC7C08 so a µPC

reset does not occur. If lock up occurs, no

pulses are output from the AMDP-CS

output and IC7C08 will automatically resetthe µPC.

The AMDP-CS output also serves as the Chip Select

signal for the AMDP (2HDW) circuit.

The logic at pin 11 sets the operational mode of the

µPC, Low for V17 models, and High for V17+ and

V17++ models. R7B11 is only used in the (+) and

(++) models.

Input CommandsFigure 4-3 illustrates the Input Command circuitry.

Commands originate from two sources, the Remote

Control or the front panel buttons. Signals from the

Remote are amplified by the Preamp and directed to

pin 72 of the µPC.

The front panel buttons are connected in a two col-

umn resistive ladder array. Each column connects to

a KSC input of the µPC, KSC0 or KSC1. When a

button is pressed, the analog voltage at that column’s

KSC input changes. The analog voltage denotes that

specific command. The µPC responds by generating

signals to perform that specific command.



Page 4-6

There are differences in the front panel button con-

figurations between the V17 chassis, and the V17+/

V17++ chassis. Both configurations are shown in

Figure 4-3. The V17 models do not have Channel

and Volume Up/Down buttons on the front panel.

SDA5 Data Line PathIt was stated earlier that the SDA5 I2C line controls

most of the TV. Figure 4-4 shows the SDA5 path to

each of the controlled circuits.

On the PCB-SIGNAL the SDA5 line is directed to

IC7C05 (Port Expander), Main and Sub Tuners,

IC6P00 (Sub Decoder), IC3A01 (MCS/Audio Con-

trol), IC2X06 (Y Enhancement) and IC2V00 (Multi

Component Processor).

The SDA5 line is routed though the JA connector to

the two A/V SW ICs, IC2L01 and IC2KO1. Two

ICs are required in the V17 due to the increased num-

ber signal inputs.

SDA5 is also directed to IC6M00 (Main Decoder)

and IC2C01 (3DYC Comb Filter) on the PCB-3DYC/

MD.

To control the Deflection circuitry, the SDA5 line is

directed through PCB-POWER, and PCB-MAIN to

IC4A01 (Deflection Jungle) on PCB-JUNGLE.



Page 4-7

CSDA / SDA3 / 3 Line SystemFigure 4-5 illustrates the paths of the data and clock

lines to the Convergence, 2HDW and Bitmap cir-

cuitry. The CSDA line is routed through PCB-

POWER to IC8A00, the Convergence Waveform

Generator. It controls raster geometry, convergence

and HV adjustments.

The SDA3 line goes to IC7H02, the Main 2HDW

Processing IC. The three line system is connected

to IC7H07, the 2HDW timing IC. The CLK, AMDP-

CS and D-OUT signals are all buffered by IC7A01

before being applied to IC7H07.

In the V17+ and V17++ chassis the D-OUT line also

controls IC8S01, the Main Bitmap IC. Return data

is directed back to the µPC over the D-IN line.

The MS-32CS output of the µPC is the BMP Chip

Select signal. It controls when data can be trans-

ferred to and from IC8S01. When High, the output

of the two OR gates in IC8M02 are at a constantHigh so no data transfer takes place. When Low, the

output of the OR gates is determined by D-OUT and

D-IN lines, enabling data transfer.



Page 4-8

µPC Parallel InputsThere are several parallel Inputs/Outputs on the µPC,

most of them are single function. Table 4-2 lists the

Parallel Inputs and their main function. Most of the

inputs are not new, but five of them may require fur-

ther description.

SD1 ... Main picture horizontal pulses, informing the

µPC that signal is present. From the frequency of

the pulses the µPC also determines if the source sig-

nal is 480i or 480p format.

SD2 ... Serves the same purpose as SD1, but for the

Sub Picture signal source.

CVBS1 ... Sub Picture NTSC Video signal, used for

V-Chip signal processing in the µPC.

CVBS0 ... Main Picture Video, or Y signal. Used

for V-Chip and Closed Caption signal processing.

HD24HZ ... Informs the µPC when the HD signal is

in the 24p format. This is not a compatible format in

the V17 chassis, and the user is informed of this.

µPC Parallel OutputsTable 4-3 lists the Parallel Outputs and their func-

tions. Most of these have also been used in the past

and need no explanation. However, four of the out-

puts may require further explanation.

M32-CS ... This is the Chip Enable signal enabling

data transfer between the µPC and the Bitmap cir-

cuitry (V17+ and V71++ Only).

M32-RST ... Resets the Bitmap circuitry when power

is switched On (V17+ and V17++ models only).

FREERUN ... The Freerun mode is automatically

activated when no signal is detected at the Main Sig-

nal source, internally generated sync is used. For

instance, when the HD Mode is forced, with no sig-

nal at the DTV inputs, Freerun is activated.

SUB FR ... Freerun mode for the Sub Picture, acti-

vated when no signal is detected.

FH1 (NTSCSW) ... used when the Main Picture

source is NTSC. If the signal is Separate Y/C it di-

rects the Y signal directly to the Main Decoder, by-

passing the 3DYC circiut. When the signal is com-

posite video it directs the Y signal from the 3DYC

circuit to the Main Decoder.

NOTES:



Page 4-9

Pin # Abbrev. Description

2 VSYNC Vert. Pulse from Vert. Output IC4B01 #4

9 SYS1A Remote input for IR Blaster circuit (V17 Only)

12 HSYNC Horiz. Pulse from Horiz. Output Q5A31

16 SD1 Main Picture source horiz. sync,

17 SD2 Sub Picture source horiz. sync.

35 CVBS1 Sub Video for V-chip processing38 CVBS0 Main Video for V-chip & Closed Caption processing

44 HD24HZ Vert. Sync - Informs µPC if an HD signal is 24P format

51 C-BUSY Busy signal from Convergence

52 C-ACK Command acknowledgement from Convergence

53 AC-OFF Informs µPC when power is lost

58 X-RAY A Low turns the set Off, from the Protect circuit

62 V-BLANK Informs the µPC when deflection is lost

64 SHORT Low indicates a short on +24V or -24V lines

65 AFT1 Main Tuner AFT voltage

66 AFT2 Sub Tuner AFT voltage67 AI From Auto Iris

Table 4-2: µPC Parallel Inputs

Pin # Abbrev. Description

3 ANTB Selects Antenna A or B

8 YS With YM times OSD insertion

11 SYS-3 IR Blaster drive (V17 Only)

13 SUB-MUTE Mutes sound from Sub Audio Output Jacks

15 SUB-CONT Reduces CRT drive to ½ during Sub Contrast adjustment

22 M32-RST Resets the Bitmap circuitry at power On (V17+/V17++ Only)

23 YM With YS times OSD insertion

24 B OSD Blue On Screen Display signal

26 G OSD Green On Screen Display signal

27 R OSD Red On Screen Display signal

29 MUTE2 Mutes sound in A/V Switch IC2K01

42 P-ON Power On command

43 M32-CS Chip Select for the Bitmap circuit (V17+ / V17++ Only)

45 3DRST Resets the 3DYC Comb Filter

48 C-E2RESET Convergence E2RESET

49 C-MUTE Disables Convergence during On/Off, Input changes, etc.

50 C-RESET Convergence Reset

54 KIL Removes Color output from 3DYC

55 FREERUN Removes sync from the input of the Main Decoder

58 MUTE 3 Mutes sound from the Audio Output, IC3E01

60 BLANK 2 Removes video drive to the CRT

61 SUB FR Removes sync from the input of the Sub Decoder

79 FH1 Selects Y signal on the PCB-3DYC (NTSCSW)

84 LED LED Drive Signal

Table 4-3: µPC Parallel Outputs



Page 4-10

A/V Network / IR

Blaster DriveThis circuitry differs be-

tween V17 models, and

V17+/V17++ models. In

the V17 models, there is one

A/V Network output, andone IR Blaster output.

In V17+ and V17++ mod-

els there is no A/V Network

feature, but there are three

IR Blaster outputs.

Figure 4-6 illustrates the AV

Network and Blaster Drive circuitry in V17 models.

The Remote Control signal from the Pre Amp is buff-

ered by Q7B2 and is directed over three paths:

1) To the main Remote input at pin 72 of the

µPC.

2) To the SYS1A input of the µPC, this is the

source signal for the Blaster drive circuitry.

3) Through Q7B09 to the A/V Network Jack.

This signal may be connected via a cable to

other Mitsubishi products, such as VCRs,

DVDs, Audio equipment, etc.

The SYS3 output from the µPC is the Blaster drivesignal. It is amplified by Q7B11 and Q7B10 and ap-

plied to the IR-Home Theater Jack.

Figure 4-7 shows the circuitry in V17+ and V17++

models. The Remote signal from the Pre Amp is stillapplied to RMIN and SYS1A inputs of the µPC.

However the SYS1A input is not used.

The SYS3 output is now held at a constant High from

the 3.3 Volt supply, through R7B11. The High sets

the µPC operational mode for the V17+ and V17++

models.

A second Remote Pre Amp has been added to the

V17+ and V17++ models. The output of Pre Amp 2

is amplified by Q7A01 and Q7A02 and directed tothe three IR Home Theater Blaster Output Jacks.

IR Remote Controls have a carrier frequency between

30 kHz and 110 kHz, depending on the

specific manufacturer. Pre Amp 2 is a

wide band amplifier that passes all fre-

quencies in that range. Therefore, Pre

Amp 2 is basically a repeater, amplify-

ing remote signals and outputting them

at the three IR Blaster Outputs.



Page 5-1

Chapter 5

Video / Color Circuitry

Signal Formats

• Overall Block Diagram

• NTSC Signal Select Circuit

• NTSC Signal Processing

• Main Y, Cb, Cr Signal Select Circuitry

• Sub Y, Cb, Cr Signal Select Circuitry

• Multi Component Processor

• On Screen Display Circuitry

• PCB-2HDW Block Diagram

• Bitmap Block Diagram



Page 5-2



Page 5-3

Signal selection in the Video/Color circuitry of the

V17 chassis is more complex than that in the V15

and V16 chassis. The complexity is due to two rea-

sons:

1) Increased number of External Inputs, four

Video / S-Y/C Inputs, two DVD Inputs,

DTV Inputs, and on the V17+ and V17++ a

Set Top Box Input (Y/C) and a VGA Input.

2) Increased signal formats compatibility.

Besides NTSC, 480i and 1080i (HD) for-

mats, the V17 accepts the 480p format.

The NTSC and 480i formats are conventional inter-

lace scanning, with a horizontal scanning rate of 15.75

kHz. In the following text and diagrams these sig-

nals are denoted as (1H).

The 480p format signals may be from the DVD and

DTV inputs. This is a progressive scan 60 frame

format, therefore the horizontal scanning rate is

doubled. 480p signals are denoted as (2H).

In V17+ and V17++ models , the Set Top Box (STB)

signal is a conventional NTSC signal. The VGA in-

put signals are a 640x480 pixels 60 Hz frame formatand are processed as a 480p signal. Table 5-1 lists

the possible signal sources in the V17, the signal for-

mats and the specific Input Jacks.

Some of the Video/Color circuitry is condensed com-

pared to that in previous chassis. The Line Dou-

bling and PIP/POP circuits have been replaced with

Video/Color Circuitry



Page 5-4

an Advance Multi-media Display ProcessorTM

(AMDPTM). This circuitry is denoted in the sche-

matics as 2HDW (2H Double Window). The cir-

cuitry performs both the line doubling and the PIP/ POP functions. The circuitry is on a single replace-

able plug in board, PCB-2HDW.

The V17+ and V17++ chassis also feature Bitmap

Menu Displays, adding additional circuitry. How-

ever the Bitmap circuitry is also on a separate plug

in PCB which helps when troubleshooting.

Overall Block DiagramFigure 5-1 illustrates an Overall Block Diagram of

the Video/Color circuitry. The NTSC Signal Select

circuit selects the Main and Sub Picture sources from

the Tuners, or an External Video or S-Y/C input.

The selected Main NTSC signal is directed through

a Comb Filter, separating the Y and C signals if the

source is composite video.

The Main Decoder converts the Y/C signals to the

YCbCr format. The signals are then applied to the

Main YCbCr Select circuit, which selects the main

signals applied to the 2HDW circuitry inputs.

The selected NTSC Sub Video signal is directed to

the Sub Decoder which separates the Y and C sig-

nals, converts them to the YCbCr format and directsthem to the Sub YCbCr Select circuit. The Sub

YCbCr Select circuit selects the sub picture signals

applied to the 2HDW circuitry.

The Main and Sub YCbCr Select circuits select ei-

ther the NTSC source signals or those from the DVD

or DTV Inputs.

SOURCE TYPE TYPE INPUTS

Main Tuner NTSC RF (Ant A or B)

Sub Tuner " RF (Ant B)

Ext-1 " Video & S-Y/C



Front " Video & S-Y/C

DVD-1 480i / 480p Y, Cb, Cr

DVD-2 480i / 480p Y, Cb, Cr

DTV 480i / 480p Y, Cb, Cr

1080i Y, Cb, Cr / RGB

*STB NTSC S-Y/C*VGA 480p RGB

*V17+ & V17++ Only

Table 5-1: Signal Sources & Formats



Page 5-5

The Main and Sub DVD/DTV Select circuits select

DVD-1, DVD-2 or the DTV input. The selected

signals are applied to the Main or Sub YCbCr Select

circuits. The selected signals from the two YCbCr

Switches are applied to the 2HDW circuitry.

The 2HDW circuitry is capable of processing NTSC,

480i, 480p and 1080i (HD) signal formats.

Line doubling on NTSC and 480i signals.

• Main picture PIP/POP signal processing• Sub picture PIP/POP signal processing

• PIP insertion

• Generates the display format, Standard,

Expand, Zoom, Stretch or Narrow.

All signal formats must be processed by the 2HDW

circuitry to generates the PIP single insert, or the

POP second window. However, 480p and 1080i

formats do not require line doubling. Therefore,

2HDW processing is not used on 480p and 1080i

main picture signals in the Standard format:• When no PIP/POP is activated.

• When the single insert PIP is activated.

Under these conditions, the (2H) Signal Select cir-

cuit, following 2HDW, selects main 480p and 1080i

signals directly, by passing the 2HDW circuit. In the

single insert mode the output of the 2HDW circuit is

only the single insert, is inserted in the main picture

later in the signal path.

For a reference, Table 5-3 shows PIP/POP combina-

tions available for each of the signal sources and the

various formats:

• Empty white square ... indicates all PIP/

POP functions are possible.

• POP ... POP cannot be activated. The

Control circuitry will not allow the samesource to be selected for the main and sub

pictures in the POP mode.

• N/A ... that signal is not available for the sub

picture source. For instance, if the main

picture is 480i from the DTV inputs, there

can be no 480p or 1080i signal at the DTV

inputs.

• Blnk ... the PIP insert will be a blank.

• None ... PIP/POP is not possible for this

main signal input. This is the case for the

VGA input.

The selected (2H) signals, from the 2HDW circuit,

or from the DTV/DVD inputs, are applied to a HD/

2H Select circuit. The following PIP Insert circuit,

inserts the single PIP in 480p or 1080i signals. The

signals are then converted to RGB and directed to

the CRT Drive circuitry.

PIP ANT-A ANT-B STB VGAMAIN NTSC NTSC 480i 480p 1080i 1 2 3 4 480i 480p 480i 480p NTSC *

ANT-A POP Blnk Blnk

ANT-B POP "

(480i) POP N/A N/A "

DTV (480p) N/A POP N/A "

(1080i) N/A N/A POP "

EXT-1 POP "

EXT-2 POP "EXT-3 POP "

EXT-4 POP "

DVD-1 (480i) DTV DTV DTV POP N/A "

DVD-1 (480p) DTV DTV DTV N/A POP "

DVD-2 (480i) DTV DTV DTV POP N/A "DVD-2 (480p) DTV DTV DTV N/A POP "

STB POP "

VGA None ← ← ← ← ← ← ← ← ← ← ← ← ← ←

= PIP & POP OK N/A = Not Available

POP = No POP Blnk = Blank Insert

Table 5-2: POP / PIP Display Matrix

DTV EXTERNAL DVD-1 DVD-2



Page 5-6

NTSC Signal Select CircuitFigure 5-2 show a simplified drawing of the Main

and Sub Picture NTSC Signal Selection Circuit (A/

V SW). The circuitry is located on the PCB-TER-

MINAL and consists of two A/V Switch ICs, IC2K01

and IC2L01.

The External 2, 3, and 4 (Front) inputs, and in the

V17+/V17++ models, the Set Top Box Input signals

are input to IC2L01. IC2L01 selects the main and

sub picture signals from these inputs and directs them

to IC2K01.

The Main Tuner, Sub Tuner and External 1 signalsare also input to IC2K01. IC2K01 selects the main

and sub signals from the Tuners, External 1 Input, or

the signals from IC2L01.

The main picture signals are routed through the PCB-

SIGNAL to the PCB-3DYC/MD, and the sub pic-

ture signals are applied to the Sub Decoder on the

PCB-SIGNAL.

The DVD-1, DVD-2, DTV and VGA inputs are on

the PCB-TERMINAL. Signals from these inputs are

directed to Select circuitry on the PCB-SIGNAL.



Page 5-7

NTSC Signal ProcessingFigure 5-3 illustrates the NTSC signal processing

circuitry. The main picture signals from the A/V

Switch circuitry are either composite video or sepa-

rate Y/C. The signal(s) are directed to the PCB-

3DYC/MD. When the signal is composite video it is

applied to pin 88 of IC2C01, the 3DYC Comb Fil-

ter.

The Comb Filter separates the Y and C components

of the video signal. The C signal is applied directly

to pin 32 of IC6M00, the Main Decoder. The Y

signal is selected by IC2C04 and directed to pin 34

of IC6M00.

When the Main signals are separate Y/C, only the C

signal passes through the Comb Filter, for noise re-

duction. The Y signal is selected by IC2C04 and

applied to pin 34 of the Main Decoder.

The Main Decoder converts the Y and C signals to

the YCbCr format and directs them to Main Picture

YCbCr Select circuitry on the PCB-SIGNAL.

The Sub Picture NTSC Signal processing is also

shown in Figure 5-3. The sub picture NTSC signal

from the A/V Switch circuitry is composite video.

The signal is directed to IC6P00, on the PCB-SIG-

NAL. IC6P00 is the Sub Decoder, which separates

the Y and C signals and converts them to the YCbCr

format. The signals then are directed to Sub Picture

YCbCr Select circuitry.





Page 5-9

Main YCbCr Select Circuitry.The Main Picture YCbCr Signal Select Circuitry

is illustrated in Figure 5-4. It consists of four Switch

ICs and the Select circuitry in IC2V00, the Multi

Component Processor. The function of each of the

ICs is given in Table 5-3, along with the signal con-

trolling that IC.

The individual Switch ICs are controlled by SW (1-

8) logic, from the Port Expander in the Control Cir-

cuitry. IC2V00 is controlled by the SDA5 data line,

an I2C line from the Control µPC.

IC2Y08 selects (NTSC) or (DVD/DTV) as the main

signals input to the 2HDW circuitry.

DVD-1, DVD-2 or DTV signals are selected by the

Select circuitry in IC2V00, and directed through

IC2Y04 to IC2Y08. In the V17+/V17++ models,

when the "MENU" button is pressed, IC2Y04 se-

lects Bitmap signals as the main picture source anddirects them through IC2Y08 to the 2HDW circuitry.

During a Bitmap Menu display, the Sub YCbCr se-

lects the normal main signal as the sub picture source

and the 2HDW circuitry inserts it in the Bitmap Menu

Display.

The circuitry on the PCB-2HDW performs line dou-

bling on 1H type signals, and when activated the PIP/

POP signal processing. The output YCbCr (2H) sig-

nals are applied IC2X06, the Y Enhancement IC on

the PCB-SIGNAL. In the IC, Y signal Aperture Im-

provement is performed, and the Cb and Cr signals

are delayed slightly to maintain timing between the

three signals.

From IC2X06, the signals are applied to one set of

inputs on IC2X08. The other set of inputs receives

signals from the Select circuitry in IC2V00, through

IC2Y04. IC2X08 selects the YCbCr (2H) signalsapplied to IC2V00. It selects (2H) signals from the

2HDW circuit, or from IC2V00’s Select circuit (via

IC2Y04).

HD signals, from the DTV inputs, are selected by

the Select circuitry in IC2V00, output at the Select

Output pins, and directed back to the Select Inputs

of the IC. The internal circuitry in IC2V00 converts

the HD YCbCr signals to RGB which are output at

pins 35, 37 and 39 of the IC.

In the Standard format main picture 480p and 1080i

signals are not processed by 2HDW circuitry, unless

POP is activated. When POP is activated, main 480p

and 1080i signals are routed through IC2Y04 and

IC2Y08 to the 2HDW circuitry. This is necessary to

generate the main POP window. In any other format

besides Standard, the signals are processed by the

2HDW circuitry.

NOTES:

IC SELECTS SW CTL

IC2Y08 (NTSC) or (DVD/DTV) SW1

IC2Y04 (*Bit Map Menu) or (IC2V00 Sel. Output) SW3

IC2V00 (DVD-1) or (DVD-2) or (DTV) SDA5IC2X08 [2HDW (2H)] or [IC2V00 (2H)] SW5

*V17 and V17++ Only

Table 5-3: Main YCbCr Signal Selection ICs





Page 5-11

Sub YCbCr Select CircuitryThe Sub Picture YCbCr Selection Circuitry is shown

in Figure 5-5. It also consists of four individual

Switch ICs, and the Select Circuitry in IC2V00. The

function of each of the ICs is given in Table 5-4.

The NTSC Sub Picture YCbCr signals, from the Sub

Decoder, are applied to one set of inputs on IC2Y10,

which selects the sub signal for the 2HDW circuitry.

The second set of inputs on IC2Y10 are either from

the DVD-1, DVD-2 or the DTV Inputs, selected by

IC2Y06.

IC2Y02 selects either DVD-1 or DVD-2 and directs

those signal to IC2Y06. The second set of inputs on

IC2Y06 receives the signals from the Select outputs

of IC2V00.

This circuit configuration allows the selection of a

DVD input for the main picture and the other DVD

input for the sub picture. It also allows a DVD input

to be selected for the sub picture when the main pic-

ture is from the DTV inputs.

However, when the main signal is DVD-1 or DVD-

2, DTV cannot be selected for the sub picture signal.

The Select circuitry in IC2V00 selects DVD input

for main picture, and therefore cannot select DTV

as a sub source. The output signals of IC2Y06 are

directed to IC2Y10, and may be selected for the

2HDW circuitry.

In the 2HDW circuitry, sub signals are processed byline doubling circuitry, PIP/POP circuitry and inserted

in the main picture signals. The outputs of the 2HDW

circuit are the main picture signal with the PIP/POP

inserted, unless the main signal is 480p or 1080i.

PIP/POP with 480p/1080i Main

When the main signal is 480p or 1080i, it is only

processed by the 2HDW circuitry in the POP mode.

It is routed to the 2HDW circuit via IC2Y04 and

IC2Y08, refer to Figure 5-4.

In the single insert PIP mode, the main signal does

not pass through the 2HDW circuitry. The output

of the 2HDW circuit is only the sub insert picture.

Note that the outputs of IC2X06 take two paths:

1) Through IC2X08 to the Y, Cb and Cr inputs

on IC2V00.

2) To the EY, ECB, ECR inputs of IC2V00.

When the main picture is 480p, IC2X08 selects that

signal instead of the output of the 2HDW circuit.

When the main source is 1080i the internal circuitry

in IC2V00 selects those signals. The insert picture

signals, at pins 62, 63 and 64 of IC2V00 are inserted

in the selected 480p or 1080i main signals in the IC.

Timing for the insertion is provided by the 2HDW-

YS signal for the 2HDW circuitry.

NOTES:

IC SELECTS SW CTL

IC2Y10 (NTSC) or (DVD/DTV) SW2

IC2Y06 (DVD) or (DTV) SW4

IC2V00 DTV may be (1080i, 480p or 480i) SDA5IC2Y02 (DVD-1) or (DVD-2) SW6

Table 5-4: Sub YCbCr Signal Selection ICs



Page 5-12





Page 5-14

OSD RGB from the Control circuitry is input at pins

50-52, and insertion is timed by the YS/YM signal at

pin 49.

On Screen Display CircuitryFigure 5-7 shows the On Screen Display (OSD) cir-

cuitry in the V17 chassis. This is the same as in that

in the V16 chassis, only component nomenclaturehas changed.

Convergence RGB OSD signals are generated in

the Convergence Waveform Generator, and are di-

rected to the Multi Component Processor (IC2V00)

on the PCB-SIGNAL. Timing for OSD insertion is

provided by the YS signal input at pin 45 of IC2V00.

Control circuitry RGB OSD signals are generated in

Control µPC and applied to pins 50-52 of IC2V00.

Timing for OSD insertion is provided by the YS and

YM signal from the µPC. The combined YS and

YM signals are directed to pin 49 of IC2V00 and

also produces the transparent gray background for

Closed Caption Displays.

Pin 49 is amplitude sensitive, key voltage levels are:

• Zero volts ... no OSD or gray background.

• 1.4 volts ... activates the gray background.

• 3.2 volts, or higher ... insert the OSD.

IC7C03 and IC7C10 are buffer ICs, increasing the

3.3 volt signals from the µPC to 5 volt signals. Both



Page 5-15

ICs are the same type. When the OE input goes

High, the logic at the A input is output at the Y out-

put (pin 4). When the OE input is Low, pin 4 goes toa high impedance state.

IC7C03 is always enabled from the 5 volt supply.

The output at pin 4 is merely an amplified version of

the YS signal from the µPC.

IC7C10 is only enabled when the YM line goes High.

When pin 4 of IC7C10 is at a high impedance state

in has no effect on the YS signal applied to pin 49 of

IC2V00. When IC7C10 is enabled, pin 4 goes Low.This forward biases D7C03 and D7C04, reducing

the YS signal from IC7C03 down to 1.4 volt, the

gray level.

Figure 5-8 illustrates YS/YM signals for:

(A) just an OSD.

(B) an OSD with a gray background.

With no gray background the YS signal provides the

only timing for OSD insertion, refer to Figure 5-8A.

Figure 5-8B shows the YS/YM signals with a gray

background. The YS line goes High for the dura-

tion of the display on each horizontal line. The YM

line generates the OSD insertion timing signal and

produces the gray background.

The YM line goes High during the background, and

drops Low during OSD insertion. When High pin 4

of IC7C10 goes Low, pulling the YS voltage from

IC7C03 down to 1.4 volts, and the gray background

is generated in IC2V00.

During OSD insertion, pin 4 of IC7C10 goes to a

high impedance state. This allows the YS signal from

IC7C03 to increase to the OSD insertion level.

NOTES:







Page 5-18

Output Signals

Five output signals are generated by the IGS IC and

directed back to circuitry on the PCB-SIGNAL.

The Y-BMP, Cb-BMP and Cr-BMP signal are di-

rected to Main Picture YCbCr Signal select circuitry.V-BMP and H-BMP sync signals are routed to the

Sync Selection circuitry on the PCB-SIGNAL.

The Bitmap signals can be considered another video

source, that is selected for the main picture when the

Bitmap is activated.

Troubleshooting

Since the PCB-BITMAP is considered a replaceable

component, troubleshooting is limited to checking

the input signals and DC supplies.

The M32-RST signal should be checked as the TV isswitched On. Normally there is no action on this

line except during turn On.

If the PCB-BITMAP has to be replaced. The TV

will operate without the PCB-BITMAP plugged in.

Normal TV functions will operated, but there will be

no menu displays.





Page 6-2



Page 6-3

Overall Block Diagram

Figure 6-1 shows an overall block diagram of the

Sync, Deflection and High Voltage circuits. Note

that the sync signal path, shown as one line, is actu-

ally separate vertical and horizontal sync in parallel.

The Vertical and Horizontal Sync Signals, sepa-

rated from the selected signal source, can be one of

three different formats.

1H -- Also known as 480i, this format can

originate from any NTSC Input, a DVD

Component Input or the DTV Input. The

horizontal frequency is 15.75 KHZ.

• 2H -- Or 480p, can originate from the

DVD or DTV Inputs and on V17+/++models, the VGA Input. The horizontal

frequency is twice the 1H rate, 31.5 KHZ.

• HD -- 1080i can be sourced from the DTV

Inputs only. The horizontal frequency is

33.75 KHZ.

The Vertical Sync frequency is 60 HZ for all com-

patible sources.

Three factors determine if the signal is processed by

circuitry on the PCB-2HDW.

1) The original signal format, 1H, 2H or HD.

2) Use of the Format Feature.

3) Use of the POP Feature.

The sync signals parallel the video signals

through the video selection and switching pro-

cess. If the source is NTSC, DVD or DTV 480i

(1H), the signal must be enhanced by Line Dou-

bling. In these instances, the signals are applied to

the PCB-2HWD by SW 7 and the Horizontal Sync

frequency is doubled. This results in a horizontal

sync frequency of 31.5 KHZ (2H). The output for-

mat is customer selectable, 480p or 960i.

If the selected source is 480p (2H) or 1080i (HD),

and the Format and POP features are not being used,

the 2HDW circuitry is bypassed using SW 5. If

the Format or POP feature is selected, the signals

are directed by SW 7 and SW5 for processing by

the 2HDW circuit.



Page 6-4

The Multi-Component Processor, IC2V00, outputs

to the Deflection Jungle either the 2H or HD sync

signals.

The sync signals are then used by the Deflection

Jungle, IC4A01, to synchronize the internal Verti-

cal and Horizontal Drive circuits.

Vertical Drive is applied to conventional Vertical

Output IC circuitry to power the Deflection Yokes.

Horizontal Drive is sent to the Output circuitry, am-

plified, then directed to the Horizontal Deflection

Yokes.

A sample of the Horizontal Deflection drive signal

is coupled to the High Voltage Regulator. Regula-tion is performed by Pulse Width Modulating the

High Voltage drive signal used to drive the High

Voltage Output MOSFET and Flyback Transformer.

More details on the Sync, Deflection and High volt-

age circuits are provided in this chapter.

Sync Block Diagram

The signal path for vertical and horizontal sync is

much longer than in a conventional TV receiver. Inaddition to the switching required by the different

signal sources, timing for the POP, Format and Line

Doubler circuits is provided by the sync signals. A

block diagram of the sync signal path is shown in

Figure 6-2. The sync path for each type of input

will be explained further.

NTSC Sync

Main Picture NTSC signals can be sourced from

the Main Tuner, external Video Inputs 1-4 and in

V17+/++ models, the STB (Set Top Box) Input.

After selection, the Luminance signal, denoted

CVBS/Y-IN, is applied to the sync separation cir-

cuitry in the Main Decoder, IC6M00 located on the

PCB-3DYC/MD.

Sub-Picture NTSC signals can be sourced from the

Sub-Tuner, external Video Inputs 1-4 or the STB

Input. The Sub Decoder, IC6P00, located on the

PCB-SIGNAL performs sync separation to the sub

picture luminance signal shown as V PIP.

The Main and Sub Picture signal path to the De-

coders is explained in Chapter 5.

DVD Sync

DVD sync is separated from the luminance signals

from the DVD 1 and 2 Inputs by IC2X01 and

IC2X02 respectively. The sync signals can be ap-

plied for timing as a Main or Sub picture.

IC2Y01 (SW 6) selects either DVD 1 or 2 if these

inputs are to be used as a Sub Picture. The MultiComponent Processor, IC2V00, is used to select a

DVD source for the Main Picture sync signal.

DTV Sync

DTV sync is applied directly from the inputs on the

PCB-TERMINAL to the Multi Component Proces-

sor. Sync can be in either of three formats:

• Sync on Green -- For RGB Sources.

• Separate H and V -- For RGBHV

Sources

• Sync on Y -- For Y, Pr, Pb Sources

For RGB and YPrPb the same input connector is

used for the Green or Y signal.

Note: Some DTV sources can include both RGB

with sync on green and RGBHV. When configured

with both inputs, timing errors can occur, resulting

in an unstable picture. In such cases, the separate H

and V Inputs should not be used.

VGA Sync

Like DTV sync, VGA sync is applied directly from

the inputs on the PCB-TERMINAL to the Multi

Component Processor.



Page 6-5







Page 6-8

Horizontal Deflection

While much of the Horizontal Deflection circuit is

carried over from previous chassis, some of the sup-

porting circuitry is new. A block diagram of the

Horizontal Deflection circuit is in Figure 6-5.

The Horizontal Drive signal from the Deflection

Jungle drives the Horizontal Output transistor,

Q5A31, by way of Q5A33, Q5A32 and T5A32. The

ground return for the yokes is provided through

C5A37, C5A38, R5A46 and the Linearity Coil,

L5A33.

Supporting Circuitry

Q5A01 has two functions.

1) Voltage Regulation

2) Pin Cushion Correction Drive.

The conduction of Q5A01 is controlled by the three

inputs to IC5A01:

• F33K

• FH STATUS

• SIDE-PIN

Vertical DeflectionWhile the output IC used for

vertical deflection has been

changed from generic #

LA7845 to TDA8177, the

theory of operation remains

unchanged. A block diagram

of the circuit is shown in Fig-

ure 6-4.

The amplifier is configured in

a capacitively coupled arrange-

ment with C4B11 in series with

the deflection yokes. Linearity

and S correction is fed back to

the inverting side of the ampli-

fier. The ground return occurrsby way of R4B10 and R4B12.

Since this chassis is capable of two deflection fre-

quencies, the deflection circuit has different voltage

requirements for the different signal sources. The

F33K input at DQ Pin 7 changes the regulation.

• HIGH = 31.5 KHZ

• LOW = 33.75 KHZ

F33K changes the DC bias on the Op-amp, IC5A01,

by switching Q5A04. This results in a bias change

on Q5A01, raising or lowering the source voltage

to the Horizontal Deflection circuit.

F33K also switches Q5A35 and Q5A34, removing

or placing R5A45 in parallel with R5A36 and

R5A37. This alters the voltage source for the Hori-

zontal Drive circuit, T5A32 and Q5A32.

To reduce circuit stresses caused when changing fre-

quencies, the FH STATUS pulses HIGH momen-

tary at the base of Q5A05 during the transition pe-

riod. The change in bias briefly lowers the output at

the emitter of Q5A01 while the circuit stabilizes.





Page 6-10

High Voltage

IC5A00 achieves High Voltage regulation by Pulse

Width Modulating the High Voltage Drive. Figure

6-6 demonstrates how this is performed.

The PWM is controlled by the Oscillator and Error

Amp Inputs. The leading edge of the Saw tooth

generated by the Oscillator is timed to the HD input

to Pin 4. This, in turn, determines the leading edge

of the PWM. The On time pulse duration of the

PWM is determined by the Error Amp.

The HV ADJ input to the Error Amp is a DC refer-

ence originating in the Convergence Generator cir-

cuit. The HV FB is a Feed Back voltage propor-

tional to the High Voltage.

During normal brightness and high voltage, the out-

put of the Error Amp is timed to trigger the trailing

edge of the PWM to give less than a 50% pulse

duration.

If an increase in beam current creates a load on the

high voltage, the Feed Back is lowered. The Out-

put of the Error Amp will increase resulting in a

delay of the sample timing and a longer pulse dura-

tion.

A decrease in beam current and resulting rise in High

Voltage will produce the opposite results.

IC5A00 also has protection circuitry, Over Current

input to Pin 7 and Over Voltage (XRAY) input to

Pin 10. If the threshold of either input is exceeded,

the PWM will be shut down. During shut down,

the Sense outputs at Pins 8 or 3 will be high. Check-

ing these pins will help determine if the shutdown iscurrent or voltage related.



Page 6-11

Figure 6-7 shows how IC5A00 is used with the High

Voltage, Regulation and Shut Down circuits.

The PWM Output drives Q5A51 and the Fly Back

Transformer. The resultant High Voltage is applied

to the CR Block and split to the CRTs.

The DX connector from the CR Block provides:

• AC HV Feed Back sample

• DC HV Feed Back sample

• Ground return for the voltage divider.

R5A58 and R5A59 couples the AC and DC HV

Feedback samples together and routes them to Pin

6 of IC5A00 where it is compared to the reference

DC voltage at Pin 11 for regulation.

Protection Circuitry

The V17 chassis protection circuitry works in con-

junction with IC5A00 to shutdown under excessive

voltage, current or arcing conditions.

Current in the High Voltage circuit is detected by

the voltage drop across Q5A51's ground return re-

sistor, R5A51. If the increase in current is exces-

sive, it will be detected at the DCL input at Pin 7,

causing IC5A00 to shut down.

Excessive High Voltage and Beam Current con-

ditions are detected by the comparators in IC5A02.

If either is excessive, a LOW is output on the

XRAY line at Connector KH, Pin 11 where it is

directed to the Control µPC, IC7A00, pin 58.





Page 7-1

Overall Convergence Signal Path

• Convergence Output Circuitry

• Convergence Control Circuitry

Chapter 7

Convergence Circuitry





Page 7-3

Convergence Circuitry

The Convergence circuitry in the V17 series of chas-

sis, is basically the same as that used in the V15 and

V16W chassis. Correction signals are generated in a serial

digital format.

• Converted to analog signals

• Amplified and directed to the sub coils in the

Deflection Yokes

The differences in the V17 chassis are:

• New Convergence Output ICs (Generic

#STK392-570)• Reduced number of ICs by combining the

Low Pass Filters (LPF) and Summing Ampli-

fiers into one IC.



Page 7-4



Page 7-5

Overall Convergence Signal PathFigure 7-1 illustrates the Convergence Circuitry

Overall Signal Path. Horizontal and vertical pulses

from the Deflection circuitry are the source for all

Convergence Correction signals. The pulses are pro-

cessed by the Flip Flops in IC8A03, providing sharp

clean pulses for the Convergence Waveform Gen-

erator, IC8A00.

IC8A00 generates correction signals in an 8 bit se-

rial digital format. Both horizontal and vertical cor-

rection signals are generated for each primary color,

red, green and blue. The correction signals are di-

rected to specific Digital to Analog (DAC) Converter

ICs. Each of the DAC ICs is comprised of two Digi-

tal to Analog Converters.

• IC8D01 and IC8D02 process Red and Green

Horizontal correction (RH & GH).

• IC8D03 and IC8D04 process Blue Horizon-

tal (BH) and Red Vertical (RV) correction.

• IC8D05 and IC8D06 process Green and

Blue Vertical correction (GV & BV).

The signals from the DACs are processed by Low

Pass Filters and Summing Amplifiers in ICs IC8D07,

IC8D08 and IC8D09. Note that green correction is

added to both the red and blue correction in the Sum-

ming Amplifiers. Therefore, green raster correction

affects all three colors, and must be adjusted before

adjusting red and blue conver-

gence.

The resulting six correction sig-

nals (RH, GH, BH, RV, GV and

BV) are directed to the Con-

vergence Output ICs on the

PCB-POWER. IC8C02 ampli-

fies the vertical correction sig-

nals and directs them to the sub

vertical coils in their respective

Deflection Yoke. IC8C01

serves the same purpose for the

horizontal correction signals.

Convergence OutputCircuitry

Figure 7-2 shows the Conver-

gence Output Circuitry in more

detail. It is basically the same

as in the V16 chassis, except

for pin number designation.

In the V16 chassis, the positiveand negative 24 Volt Supplies

had to be increased to +34 and

-34 Volts at the edges of the

picture. This increased the con-

vergence correction at the

edges of the picture. With the

new output ICs in the V17 this





Page 7-7

Convergence Control CircuitryThe Convergence Control Circuitry is shown in Fig-

ure 7-5, and is also similar to the V16 chassis. All

convergence control signals originate in the Control

µPC, IC7A00. The CE2RST, CMUTE and CRESET

commands are buffered by IC7A01 before being ap-

plied to the Convergence circuitry. The purpose of

each of the control lines is given in the following.

CSDA I2C data line … transfers data to and fromIC8A00.

CSCL clock line … times data transfer.

CACK acknowledgment line … IC8A00 informs

the µPC that it has received a command.

CBUSY … IC8A00 holds this line Low when per-

forming a command, informing the µPC it is busy.

CRESET … Factory use, resets all convergence data

to its’ nominal point.

CMUTE … Removes all convergence correction

drive to the Convergence Output Amplifiers.

CE2RST … If lock up occurs, the CBUSY line isheld at a constant Low. The µPC responds by driv-

ing the CE2RST line momentarily High. This mo-

mentarily removes the 5 volt supply from IC8A01,

unlocking the E2PROM.





Page 8-1

Signal Sources / Outputs

• Signal Paths

• Audio Output Amplifier

Chapter 8

Sound Circuitry



Page 8-2



Page 8-3

Sources / OutputsLike the Video, the number of sound sources avail-

able has increased in the V17 chassis. These sources

include:

Main Tuner

• Sub Tuner (monaural only)

• External Inputs 1 through 3

• Front External Inputs

• Digital TV inputs (DTV)

• DVD Inputs 1 & 2

In the V17+ and V17++ chassis the Set Top Box

(STB) inputs are added to the list.

The sound outputs include:

• Set’s Speakers

• Monitor Outputs (fixed or variable)

• PIP Sound Outputs

Sound Signal PathFigure 8-1 illustrates and Overall Diagram of the

Sound Circuitry. The same ICs used to select Main

and Sub NTSC video sources are used to select the

sound source, IC2L01 and IC2K01.

IC2L01 selects the sound source from the EXT-2,

EXT-3, FRONT, DVD-1 or DVD-2 inputs. In the

V17+ and V17++ models, the STB Inputs are also

selectable by IC2L01. The selected signals from

IC2L01 are directed to IC2K01.

IC2K01 selects the signals from the EXT-1, DTV,Main Tuner, Sub Tuner or that selected by IC2L01.

It selects both the main and sub (PIP) sound signal

sources.

The selected sub sound source signals are directed

to the Right and Left PIP Output Jacks on the rear

of the TV.

The Main Tuner Sound Signal is directed to IC3A01,

the MCS/A-Control IC. The signal is decoded and

broken down into its separate right and left audio

channels. The right and left channels are directed to

pins 29 and 31 of IC2K01. If a broadcast SAP sig-

nal is the selected source, it is selected in IC3A01

and applied to pins 29 and 31 of IC2K01.

The sound signal from the Sub Tuner is monaural

and is applied directly to pin 25 of IC2K01.

The selected main sound source signal, either the

Main Tuner, EXT-1 or DTV Inputs, or the signals

from IC2L01, are output at pins 43 and 45 of

IC2K01. The signals are then directed through the

Audio Control circuitry in IC3A01 and conventional

sound adjustments may be made, volume, treble, bass,

etc.

The signals from the Audio Control circuitry take

two paths:

1) To the Audio Amplifier, IC3E01, on thePCB-POWER.

2) To the left and right Variable Inputs at pins

59 and 61 of IC2K01.

IC3E01 amplifies the right and left channel signals,

and through the EL connector directs them to the

TV’s speakers.

Either fixed or variable level sound signals may be

selected for the Monitor Audio Output Jacks. Fixed

level signals are derived from the main sound source.

Variable level signals are derived from the signals

output from the Audio Control circuitry in IC3A01,

and directed back to pin 59 and 61 of IC2K01. The

selected signals are output at pin 52 and 54 of IC2K01

and directed to the Monitor Output Jacks.

Sound Circuitry



Page 8-4

NOTES:



Page 8-5

Audio Output AmplifierFigure 8-2 illustrates the Audio Output Amplifiers

in IC3E01. This is the same IC used in the VZ7 and

VZ8 chassis. Internally it is divided into Right and

Left Output Amplifiers.

The first stage in the amplifier is a phase splitter,

outputting two signals 180 degrees a part. The in-

phase signal (+), and the out of phase signal (-) are

amplified by two separate amplifiers. The amplified

(+) signal is applied to one end of the speaker's coil,

and the (-) signal to the other end of the coil.

This type of push/pull speaker drive eliminates the

need for a large electrolytic capacitor to block DC,

between the output IC and the speaker. The capaci-tor is not needed since the average DC voltage at the

(+) and (-) outputs of the IC are the same, approxi-

mately 9 volts. Removing the capacitor also improves

the low frequency response of the signal applied to

the speakers.

IC3E01 also has an internal Mute circuit. When the

voltage at pin 6 goes High, no sound is output from

the IC. The logic at pin 6 of the IC is controlled by

the MUTE-3 command from the Control circuitry.



Page 8-6





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Mitsubishi V17 Training Manual