Jvc Lcd Lt-42dp8b Lt-42p80bg_p Chassis Fl5

SERVICE MANUAL

COPYRIGHT 2007 Victor Company of Japan, Limited No.YA5452007/8

INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISIONYA54520078SERVICE MANUAL

LT-42DP8BG/P,LT-42DP8BJ/P,LT-42P80BU/P

COPYRIGHT 2007 Victor Company of Japan, Limited

TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-114 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-175 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

BASIC CHASSIS

FL5

1-2 (No.YA545)

SPECIFICATION

Design & specifications are subject to change without notice.

ItemsContents

LT-42DP8BJ/P LT-42DP8BG/P LT-42P80BU/PDimensions ( W H D ) 103.0 cm 71.9 cm 29.6 cm [Included stand]

103.0 cm 67.2 cm 12.2 cm [TV only]Mass 28.5 kg [Included stand]

26.4 kg [TV only]28.0 kg [Included stand]25.9 kg [TV only]

Power Input AC220V - AC240 V, 50 HzPower Consumption 220 W (Standby: 0.5 W) 214 W (Standby: 0.5 W)TV RF System Analog CCIR (I) CCIR (B/G, I, D/K, L)

Digital DVB-T ---Colour System PAL, NTSC 3.58/4.43 [EXT only] PAL, SECAM, NTSC 3.58/4.43 [EXT only]Stereo System NICAM (I) NICAM (B/G, I, D/K, L), A2 (B/G, D/K)ReceivingFrequency

Analog UHF: 470 MHz - 862 MHz VHF: 47MHz - 470MHzUHF: 470 MHz - 862 MHzCATV: 116MHz - 172MHz / 220MHz - 469MHz

Digital UHF:470 MHz - 854 MHz UHF:174 MHz - 230 MHzUHF:470 MHz - 862 MHz

---

IntermediateFrequency

VIF 38.9MHz (I) 38.9MHz (B/G, I, D/K, L)SIF 32.9MHz (6.0MHz:I) 33.4MHz (5.5MHz:B/G)

32.9MHz (6.0MHz:I)32.4MHz (6.5MHz:D/K)

Colour SubCarrier Frequency

PAL 4.43MHzSECAM --- 4.40625MHz / 4.25MHz

NTSC 3.58MHz / 4.43MHzTeletext System Analog FLOF (Fastext level 2.5) /

WST(World Standard system)FLOF (Fastext level 2.5) / TOP / WST(World Standard system)

Digital MHEG 5 UK profile EBU TEXT ---LCD panel 42V-inch wide aspect (16 : 9) Screen Size Diagonal: 105 cm (H: 93.0 cm V: 52.3 cm) Display Pixels Horizontal: 1366 dots Vertical: 768 dots (W-XGA)Audio Power Output 10 W + 10 WSpeaker 5.5 cm 20.0 cm, oval type 2 (Oblique Cone)Aerial terminal (VHF/UHF) 75 unbalanced, coaxialEXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) 2EXT-3 (Input) S-Video Mini-DIN 4 pin 1

Y: 1 V (p-p), Positive (Negative sync provided), 75 C: 0.286 V (p-p) (Burst signal), 75

Video 1 V (p-p), Positive (Negative sync provided), 75 , RCA pin jack 1Audio 500 mV (rms), High impedance, RCA pin jack 2

EXT-4 (Input) Component Video750p / 1125i

625p / 525p / 625i / 525i

RCA pin jack 3Y: 1 V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 / Pb/Pr: 0.35V(p-p), 75 Y: 1 V (p-p), Positive (Negative sync.), 75 / Cb/Cr: 0.7V(p-p), 75

Audio 500 mV(rms) (-4dBs), high impedance, RCA pin jack 2Digital input[DIGITAL-IN 1/2]

Video / Audio HDMI 2-row 19pin connector 2(Digital-input terminal is not compatible with picture signals of personal computer)

PC (RGB) Input D-sub 3-row 15pin 1R/G/B : 0.7V (p-p), 75HD / VD : 1V (p-p) to 5V (p-p), high impedance< Available signal >VGA : 640 pixels 480 pixels (Horizontal : 31.5kHz / Vertical : 60Hz)XGA : 1024 pixels 768 pixels (Horizontal : 48.4kHz / Vertical : 60Hz)

Audio Output 500 mV (rms), Low impedance, RCA pin jack 2Digital Audio Optical Output Digital SPDIF 1 ---Headphone 3.5 mm stereo mini jack 1Remote Control Unit RM-C1911 (AA/R6 dry cell battery 2) RM-C1910 (AA/R6 dry cell battery 2)

(No.YA545)1-3

SECTION 1PRECAUTION

1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK](1) The design of this product contains special hardware,

many circuits and components specially for safetypurposes. For continued protection, no changes should bemade to the original design unless authorized in writing bythe manufacturer. Replacement parts must be identical tothose used in the original circuits. Service should beperformed by qualified personnel only.

(2) Alterations of the design or circuitry of the products shouldnot be made. Any design alterations or additions will voidthe manufacturer's warranty and will further relieve themanufacturer of responsibility for personal injury orproperty damage resulting therefrom.

(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. Thesecharacteristics are often not evident from visual inspectionnor can the protection afforded by them necessarily beobtained by using replacement components rated forhigher voltage, wattage, etc. Replacement parts whichhave these special safety characteristics are identified inthe parts list of Service manual. Electrical componentshaving such features are identified by shading on theschematics and by ( ) on the parts list in Servicemanual. The use of a substitute replacement which doesnot have the same safety characteristics as therecommended replacement part shown in the parts list ofService manual may cause shock, fire, or other hazards.

(4) Don't short between the LIVE side ground andISOLATED (NEUTRAL) side ground or EARTH sideground when repairing. Some model's power circuit is partly different in the GND.The difference of the GND is shown by the LIVE : ( ) sideGND, the ISOLATED (NEUTRAL) : ( ) side GND andEARTH : ( ) side GND. Don't short between the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND and nevermeasure the LIVE side GND and ISOLATED (NEUTRAL)side GND or EARTH side GND at the same time with ameasuring apparatus (oscilloscope etc.). If above note willnot be kept, a fuse or any parts will be broken.

(5) When service is required, observe the original lead dress.Extra precaution should be given to assure correct leaddress in the high voltage circuit area. Where a short circuithas occurred, those components that indicate evidence ofoverheating should be replaced. Always use themanufacturer's replacement components.

(6) Isolation Check (Safety for Electrical Shock Hazard) After re-assembling the product, always perform anisolation check on the exposed metal parts of the cabinet(antenna terminals, video/audio input and output terminals,Control knobs, metal cabinet, screw heads, earphone jack,control shafts, etc.) to be sure the product is safe to operatewithout danger of electrical shock.

a) Dielectric Strength Test The isolation between the AC primary circuit and all metalparts exposed to the user, particularly any exposed metalpart having a return path to the chassis should withstand avoltage of 3000V AC (r.m.s.) for a period of one second. (.. . . Withstand a voltage of 1100V AC (r.m.s.) to anappliance rated up to 120V, and 3000V AC (r.m.s.) to anappliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generallyfound in the service trade.

b) Leakage Current Check Plug the AC line cord directly into the AC outlet (do not usea line isolation transformer during this check.). Using a"Leakage Current Tester", measure the leakage currentfrom each exposed metal part of the cabinet, particularlyany exposed metal part having a return path to the chassis,to a known good earth ground (water pipe, etc.). Anyleakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC(r.m.s.). Alternate Check Method

Plug the AC line cord directly into the AC outlet (do notuse a line isolation transformer during this check.). Usean AC voltmeter having 1000 per volt or moresensitivity in the following manner. Connect a 150010W resistor paralleled by a 0.15F AC-type capacitorbetween an exposed metal part and a known good earthground (water pipe, etc.). Measure the AC voltageacross the resistor with the AC voltmeter. Move theresistor connection to each exposed metal part,particularly any exposed metal part having a return pathto the chassis, and measure the AC voltage across theresistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Any voltage measured mustnot exceed 0.75V AC (r.m.s.). This corresponds to0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER

(HAVING 1000 /V,

OR MORE SENSITIVITY)

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART1500 10W

0.15 F AC-TYPE

GOOD EARTH GROUND

1-4 (No.YA545)

1.2 SAFETY PRECAUTIONS [FOR UK](1) The design of this product contains special hardware and many circuits and components specially for safety purposes. For

continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer.Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnelonly.

(2) Alterations of the design or circuitry of the product should not be made. Any design alterations or additions will void themanufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damageresulting therefrom.

(3) Many electrical and mechanical parts in the product have special safety-related characteristics. These characteristics are oftennot evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacementcomponents rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics areidentified in the Parts List of Service Manual. Electrical components having such features are identified by shading on theschematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have thesame safety characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock,fire, or other hazards.

(4) The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts,high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service isrequired, the original lead routing and dress should be observed, and it should be confirmed that they have been returned tonormal, after re-assembling.

WARNING(1) The equipment has been designed and manufactured to meet international safety standards.(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.(3) Repairs must be made in accordance with the relevant safety standards.(4) It is essential that safety critical components are replaced by approved parts.(5) If mains voltage selector is provided, check setting for local voltage.

(No.YA545)1-5

1.3 INSTALLATION1.3.1 HEAT DISSIPATIONIf the heat dissipation vent behind this unit is blocked, coolingefficiency may deteriorate and temperature inside the unit willrise. The temperature sensor that protects the unit will beactivated when internal temperature exceeds the pre-determinedlevel and power will be turned off automatically.Therefore,please make sure pay attention not to block the heat dissipationvent as well as the ventilation outlet behind the unit and ensurethat there is room for ventilation around it.

1.3.2 INSTALLATION REQUIREMENTSEnsure that the minimal distance is maintained, as specifiedbelow, between the unit with and the surrounding walls, as wellas the floor etc.Install the unit on stable flooring or stands.Takeprecautionary measures to prevent the unit from tipping in orderto protect against accidents and earthquakes.

1.3.3 INSTALLATION REQUIREMENTSTo ensure safety in an emergency such as an earthquake, andto prevent accidents, ensure that measures are taken to preventthe TV dropping or falling over.

1.3.4 NOTES ON HANDLINGWhen taking the unit out of a packing case, do not grasp theupper part of the unit. If you take the unit out while grasping theupper part, the LCD PANEL may be damaged because of apressure. Instead of grasping the upper part, put your hands onthe lower backside or sides of the unit.

1.4 HANDLING LCD PANEL1.4.1 PRECAUTIONS FOR TRANSPORTATIONWhen transporting the unit, pressure exerted on the internal LCDpanel due to improper handling (such as tossing and dropping)may cause damages even when the unit is carefully packed. Toprevent accidents from occurring during transportation, paycareful attention before delivery, such as through explaining thehandling instructions to transporters.Ensure that the following requirements are met duringtransportation, as the LCD panel of this unit is made of glass andtherefore fragile:

(1) USE A SPECIAL PACKING CASE FOR THE LCD PANELWhen transporting the LCD panel of the unit, use a specialpacking case (packing materials). A special packing caseis used when a LCD panel is supplied as a service sparepart.

(2) ATTACH PROTECTION SHEET TO THE FRONTSince the front (display part) of the panel is vulnerable,attach the protection sheet to the front of the LCD panelbefore transportation. Protection sheet is used when a LCDpanel is supplied as a service spare part.

(3) AVOID VIBRATIONS AND IMPACTSThe unit may be broken if it is toppled sideways even whenproperly packed. Continuous vibration may shift the gap ofthe panel, and the unit may not be able to display imagesproperly. Ensure that the unit is carried by at least 2persons and pay careful attention not to exert any vibrationor impact on it.

(4) DO NOT PLACE EQUIPMENT HORIZONTALLYEnsure that it is placed upright and not horizontally duringtransportation and storage as the LCD panel is veryvulnerable to lateral impacts and may break. Duringtransportation, ensure that the unit is loaded along thetraveling direction of the vehicle, and avoid stacking themon one another. For storage, ensure that they are stackedin 2 layers or less even when placed upright.

Ventilation hole

*Diagram differs from actual appearance.


200 mm

150 mm 50 mm 150 mm 50 mm

It fixes in a band.

TV STAND


1-6 (No.YA545)

1.4.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)(1) Avoid placing the unit under direct sunlight over a

prolonged period of time. This may cause the optical filterto deteriorate in quality and COLOUR.

(2) Clean the filter surface by wiping it softly and lightly with asoft and lightly fuzz cloth (such as outing flannel).

(3) Do not use solvents such as benzene or thinner to wipe thefilter surface. This may cause the filter to deteriorate inquality or the coating on the surface to come off. Whencleaning the filter, usually use the neutral detergent dilutedwith water. When cleaning the dirty filter, use water-dilutedethanol.

(4) Since the filter surface is fragile, do not scratch or hit it withhard materials. Be careful enough not to touch the frontsurface, especially when taking the unit out of the packingcase or during transportation.

1.4.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIORPARTS

Take note of the following when replacing exterior parts (REARCOVER, FRONT PANEL, etc.):

(1) Do not exert pressure on the front of the LCD panel (filtersurface). It may cause irregular COLOUR.

(2) Pay careful attention not to scratch or stain the front of theLCD panel (filter surface) with hands.

(3) When replacing exterior parts, the front (LCD panel) shouldbe placed facing downward. Place a mat, etc. underneathto avoid causing scratches to the front (filter surface).

1.4.4 HOW TO CHECK THE OPERATING TIME This model has a function to count and record the LCD paneloperating time. The operating time can be checked in thefollowing procedure. Maximum count time = 131070 hours

(1) Press the [INFORMATION] key and [MUTING] key simul-taneously, then enter the SERVICE MODE.

(2) When the Main Menu is displayed, press [2] key to enterthe self check mode.

(3) The operating time of the LCD panel is displayed in 5-digitdecimal number.(Refer to the below figure)

1.4.5 HOW TO RESET THE OPERATING TIME(1) Press the [MENU] key simultaneously, then enter the

USER MENU.(2) Select the "Features" from the USER MENU.(3) Select the Blue back from the Features.(4) Set the Blue back to Off.(5) Press the [INFORMATION] key and [MUTING] key

simultaneously, then enter the SERVICE MODE.(6) When the Main Menu is displayed, press [2] key to enter

the self check mode.(7) When the self check screen(page-1) is displayed, press

[ZOOM] key.(8) "RESET : OK" is displayed under the operating time.(9) Press the [TV] key to reset the operating time.

NOTE:When the LCD PANEL UNIT is replaced, be sure to reset theoperating time following the above method.

SELF CHECK MODE SCREEN (Page 1)

SERVICE MENUSERVICE MENU

1. ADJUST 1. ADJUST

2. SELF CHECK 2. SELF CHECK

3. I2C STOP 3. I2C STOP

LOB 0 FAN 0LOB 0 FAN 0

AUD 0 AUD 0

ANA 9 DIG 9ANA 9 DIG 9

HOUR 131070 MAX 0HOUR 131070 MAX 0

RESET : OK 1RESET : OK 1

The operating time is displayed

MAX is displayed when the maximumcount time is exceeded

Switch the display/ non-display

with the [ZOOM] key.

Press [2] key

SERVICE MODE SCREEN

*When the power is turned off with the remote control unit or the power

button of the main unit, the count restarts from the turn off time.

*When the power is turned off by disconnecting the power cord from the

AC outlet, the recorded time count less than 2 hours is not counted.

*When the operating time exceeds the maximum count time, "MAX" is

displayed to the right of the counted time, and the following count is

discontinued.

(No.YA545)1-7

SECTION 2SPECIFIC SERVICE INSTRUCTIONS

2.1 SYSTEM SETTING

(1) Press the [INFORMATION] key and [MUTING] keysimultaneously, then enter the SERVICE MODE.

(2) When the Main Menu is displayed, press [2] key to enterthe self check mode.

(3) Turn off the power by pressing the [POWER] key on theremote control unit.

2.2 FEATURES100Hz Clear Motion Drive

This function is able to display twice as many frames as aconventional LCD display.

DIGITAL TUNER [LT-42DP8 series only]This TV can receive both DVB-T (Digital terrestrial broadcasting)and Analogue terrestrial broadcasting.

D.I.S.T. (Digital Image Scaling Technology)This system uses line interpolation to double the number ofscanning lines and achieve high resolution, flicker-free picture.

Colour ManagementThis function ensures dull colours are compensated toproduce natural hues.

Picture ManagementThis function makes it easier to see the dark areas when apicture has many dark areas, and makes it easier to see thebright areas when a picture has many bright areas.

Smart PictureThis function detects the APL (Average Picture Level) andadjusts the contrast suitable for what you are watching.

DIGITAL VNRThis function cuts down the amount of noise in the originalpicture.

MPEG Noise Reduction This function effects the block noise removal and mosquito NRsimultaneously.

MaxxAudioMaxxAudio improves sound performance with four soundfeatures (MaxxBass, MaxxTreble, MaxxStereo andMaxxVolume).

2.3 MAIN DIFFERENCE LIST

Be sure to carry out the following operation at the end ofthe procedure.

SERVICE MODE SCREEN



1. ADJUST 1. ADJUST




AUD 0 AUD 0


HOUR 131070 MAX 0HOUR 131070 MAX 0

RESET : OK 1RESET : OK 1

Press [2] key

Item LT-42DP8BJ/P LT-42DP8BG/P LT-42P80BU/PDigital Tuner YES NO

Teletext (Digital) MHEG 5 UK profile EBU TEXT NO

Indoor ANT Power Supply YES NO

Digital Audio Optical Output YES NO

Remote Control Unit RM-C1911 RM-C1910

1-8 (No.YA545)

2.4 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2

(P-P= Peak to Peak, B-W= Blanking to white peak)

Pin No. Signal designation Matching value EXT-1 EXT-21 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)

2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)

3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)

4 AUDIO GND Used Used

5 GND (B) Used Used

6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2)

7 B input 700mV(B-W), 75 Used Used8 FUNCTION SW

(SLOW SW)Low : 0V-3VHigh : 8V-12V, High impedance

Used Used

9 GND (G) Used Used

10 SCL / T-V LINK Not used Used (SCL2 / TV-LINK)

11 G input 700mV(B-W), 75 Used Used12 SDA Not used Used (SDA2)

13 GND (R) Used Used

14 GND (YS) Used Not used

15 R / C input R : 700mV(B-W), 75 C : 300mV(P-P), 75

Used (C1/R) Used (C2/R)

16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75 Used Used17 GND (VIDEO output) Used Used

18 GND (VIDEO input) Used Used

19 VIDEO output 1V(P-P) (Negative sync), 75 Used (TV OUT) Used (LINE OUT)20 VIDEO / Y input 1V(P-P) (Negative sync), 75 Used (Y1/V) Used (Y2/V)21 COMMON GND Used Used

20 18 16 14 12 10 8 6 4 2

21 19 17 15 13 11 9 7 5 3 1

[Pin assignment]

(No.YA545)1-9

2.5 TECHNICAL INFORMATION2.5.1 LCD PANELThis unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of theconventional CRT (Cathode Ray Tube), as a display unit.Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where lightdoes not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.

2.5.1.1 SPECIFICATIONSThe following table shows the specifications of this unit.

2.5.1.2 PIXEL FAULTThere are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.

BRIGHT FAULTIn this pixel fault, a cell that should not light originally is lighting on and off.For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.

DARK FAULTIn this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.

FLICKER FAULTIn the pixel fault, a cell that should light originally or not light originally is flashing on and off.For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing onand off.

Item SpecificationsMaximum dimensions ( W H D ) 98.3 cm 57.6 cm 5.2 cm

Weight 15.0 kg

Effective screen size Diagonal: 1050 mm (H: 930.25 mm V: 523.01 mm)

Aspect ratio 16 : 9

Drive device / system a-Si-TFT active matrix system

Resolution Horizontally 1366 Vertically 768 RGB 3147264 dots in total

Pixel pitch (pixel size) Horizontally: 0.681 mm, Vertically: 0.681 mm

Displayed colour 16777216 colours 256 colours for R G and B

Brightness 500cd/m2

Contrast ratio 1500 : 1

Response time (Tr) less than 8 ms

View angle (Horizontally) 178

View angle (Vertically) 178

Surface polarizer Anti-Glare type Low reflective coat

Colour filter Vertical stripe

Backlight Cold cathode fluorescent lamp 20

Power supply voltage in LCD 12 V

Power supply voltage in inverter 24 V

Panel interface system LVDS (Low Voltage Differential Signaling)

1-10 (No.YA545)

2.5.2 MAIN CPU PIN FUNCTION [IC7301 : DIGITAL PWB]Pin Pin name I/O Function Pin Pin name I/O Function 1 TCK O Test purpose 65 D2 I/O Program ROM data for main CPU2 TMS I Test purpose 66 D12 I/O Program ROM data for main CPU3 TDI I Test purpose 67 D10 I/O Program ROM data for main CPU4 TDO O Test purpose 68 VSS33 - GND5 P2.8 I Input for HDMI CEC 69 VDD33 I 3.3V6 P2.9 O Blue for OSD 70 D4 I/O Program ROM data for main CPU7 P2.10 O Blue for OSD 71 D3 I/O Program ROM data for main CPU8 P2.11 O Blue for OSD 72 D11 I/O Program ROM data for main CPU9 P2.12 O Blue for OSD 73 RSTIN I Reset10 P2.13 O Blue for OSD 74 POWER O Sleep state release for chassis CPU [Release : L]11 P2.14 I TV-LINK data 75 P3.1 O Reset for digital tuner unit12 P2.15 O Request for chassis CPU communication 76 REMOCON I Remote control13 VSS33 - GND 77 P3.3 I Clock for OSD14 VDD33 I 3.3V 78 P3.4 O Red for OSD15 P4.5 O TV-LINK data 79 P3.5 O Red for OSD16 A20 O Program ROM address for main CPU 80 P3.6 O Red for OSD17 A19 O Program ROM address for main CPU 81 P3.7 O Red for OSD18 A18 O Program ROM address for main CPU 82 MTST I/O Data transmission for chassis CPU communication19 A17 O Program ROM address for main CPU 83 MTSR I/O Data receive for chassis CPU communication20 VSS25 - GND 84 VSS33 - GND21 VDD25 I 2.5V 85 VDD33 I 3.3V22 A16 O Program ROM address for main CPU 86 VSS25 - GND23 A8 O Program ROM address for main CPU 87 VDD25 I 2.5V24 A7 O Program ROM address for main CPU 88 TXD0 I/O Data transmission for digital tuner unit25 A9 O Program ROM address for main CPU 89 RXD0 I/O Data receive for digital tuner unit26 A6 O Program ROM address for main CPU 90 P3.12 O Red for OSD27 A5 O Program ROM address for main CPU 91 CLK O Clock for chassis CPU communication28 A10 O Program ROM address for main CPU 92 P3.15 O Output for HDMI CEC29 A11 O Program ROM address for main CPU 93 P5.14 O Green for OSD30 A12 O Program ROM address for main CPU 94 P5.15 O Green for OSD31 VSS33 - GND 95 TRIG_IN O Green for OSD32 VDD33 I 3.3V 96 TRIG_OUT O Green for OSD33 A4 O Program ROM address for main CPU 97 P6.2 O Green for OSD34 A3 O Program ROM address for main CPU 98 P6.3 I/O I2C bus clock (for main memory)35 A2 O Program ROM address for main CPU 99 P6.4 I/O I2C bus Data (for main memory)36 A1 O Program ROM address for main CPU 100 P6.5 O Sync signal select for OSD / Teletext37 A0 O Program ROM address for main CPU 101 IRQ O Interrupt request for digital tuner unit38 A13 O Program ROM address for main CPU 102 VSYNC I Vertical sync39 ARAS/A14 O Program ROM address for main CPU 103 HSYNC I Horizontal sync40 CAS/A15 O Program ROM address for main CPU 104 COR/RSTOUT O Not used41 VSS33 - GND 105 BLANK O Ys for OSD / Teletext42 VDD33 I 3.3V 106 VDD33 I 3.3V43 MEMCLK O Clock for memory 107 VSS33 - GND44 CSSDRAM O Chip select for memory 108 XTAL1 I 6MHz for system clock45 CLKEN O Clock enable for memory 109 XTAL2 O 6MHz for system clock46 CSROM O Chip select for memory 110 VSSA - GND47 RD O Read for memory 111 VDDA I 2.5V48 UDQM O Control buffer of memory 112 R O R for Teletext49 LDQM O Control buffer of memory 113 G O G for Teletext50 WR O Write for memory 114 B O B for Teletext51 D15 I/O Program ROM data for main CPU 115 VSSA - GND52 VSS33 - GND 116 VDDA I 2.5V53 VDD33 I 3.3V 117 CVBS2 I Not used54 D7 I/O Program ROM data for main CPU 118 VSSA - GND55 D0 I/O Program ROM data for main CPU 119 VDDA I 2.5V56 D14 I/O Program ROM data for main CPU 120 CVBS1B I Not used57 D8 I/O Program ROM data for main CPU 121 CVBS1A I Video for Teletext58 D6 I/O Program ROM data for main CPU 122 VSSA - GND59 D1 I/O Program ROM data for main CPU 123 VDDA I 2.5V60 VSS33 - GND 124 KEY1 I Key scan data 1 [ON : H]61 VDD33 I 3.3V 125 KEY2 I Key scan data 2 [ON : H]62 D13 I/O Program ROM data for main CPU 126 MECA_SW I Main power ON / OFF control [ON : L]63 D9 I/O Program ROM data for main CPU 127 (KEYP2)P5.3 I Error detection for digital tuner unit64 D5 I/O Program ROM data for main CPU 128 TMODE I Test purpose

(No.YA545)1-11

SECTION 3DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE Be sure to perform the SYSTEM SETTING, at the end of the procedure. Make sure that the power cord is disconnected from the outlet. Pay special attention not to break or damage the parts. Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.

REFERENCE:When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard CircuitDiagram.

3.1.1 REMOVING THE REAR COVER (Fig.3-1)(1) Remove the 1 screw [A].(2) Remove the POWER CORD COVER.(3) Remove the POWER CORD.(4) Remove the 10 screws [B], 4 screws [C], 5 screws [D], 2

screws [E] and 1 screw [F].(5) Remove the REAR COVER.

3.1.2 REMOVING THE ANALOG PWB (Fig.3-1) Remove the REAR COVER.

(1) Remove the 1 screw [G].(2) Remove the TUNER BASE.(3) Remove the 3 hooks [a], 2 screws [H] and 3 screws [I].(4) Remove the TERMINAL BASE.(5) Remove the 5 screws [J] and 2 screws [K].(6) Remove the ANALOG PWB.

3.1.3 REMOVING THE DC-DC PWB (Fig.3-1) Remove the REAR COVER.

(1) Remove the 2 screws [L].(2) Remove the DC-DC PWB.

3.1.4 REMOVING THE POWER PWB (Fig.3-1) Remove the REAR COVER.

(1) Remove the 11 screws [M].(2) Remove the POWER PWB.

3.1.5 REMOVING THE SW PWB (Fig.3-1) Remove the REAR COVER.

(1) Remove the 2 screws [N].(2) Remove the CONTROL KNOB with SW PWB.(3) Remove the 2 screws [O].(4) Remove the SW PWB from the CONTROL KNOB.

3.1.6 REMOVING THE DIGITAL TUNER UNIT[LT-42DP8 series only] (Fig.3-1)

Remove the REAR COVER.(1) Remove the 9 hooks [b].(2) Remove the SHIELD COVER.(3) Remove the 2 screws [P], 2 screws [Q] and 2 screws [R].(4) Remove the SHIELD TERMINAL.(5) Remove the 4 screws [S].(6) Remove the DIGITAL TUNER UNIT.

3.1.7 REMOVING THE DIGITAL PWB (Fig.3-1) Remove the REAR COVER. Remove the SHIELD COVER. Remove the SHIELD TERMINAL. Remove the DIGITAL TUNER UNIT. [LT-42DP8 series only]

(1) Remove the 7 screws [T].(2) Remove the DIGITAL PWB BRACKET.

[LT-42DP8 series only](3) Remove the 2 screws [U].(4) Remove the DIGITAL PWB.

CAUTION :Make sure to perform the "SYSTEM SETTING", whenDIGITAL PWB is replaced.

3.1.8 REMOVING THE SPEAKER (Fig.3-1) Remove the REAR COVER.

(1) Remove the 2 screws [V].(2) Remove the SPEKAER.(3) Follow the same steps when removing the other hand

SPEAKER.

3.1.9 REMOVING THE STAND ASS'Y (Fig.3-1)(1) Remove the 1 screw [F] and 4 screws [W].(2) Remove the STAND ASS'Y.

3.1.10 REMOVING THE LED PWB (Fig.3-1) Remove the REAR COVER. Remove the STAND ASS'Y.

(1) Remove the 5 screws [X] and 2 screws [Y].(2) Remove the STAND BASE SUPPORT.(3) Remove the 2 screws [Z] and 2 hooks [c].(4) Remove the LED PWB.

3.1.11 REMOVING THE LCD PANEL UNIT (Fig.3-1) Remove the REAR COVER. Remove the STAND ASS'Y. Remove the STAND BASE SUPPROT. Remove the SPEKAER.

(1) Remove the 4 screws [AA], 4 screws [AB] and 4 screws[AC].

(2) Remove the MAIN BASE.(3) Remove the LCD PANEL UNIT from the FRONT PANEL.

1-12 (No.YA545)

Fig.3-1

STAND BASE

SUPPORT

MAIN BASE

DIGITAL PWB BRACKET

SHIELD COVER

M

U

S

T

P

R

Q

AC

AC

AC

AA

GAA

X

Y

V

AB

J

B

B

B

D

A

D

F

E

C

H

NO

N

AC

AB

L

K

I

L

W

V

Z

REAR COVER

STAND ASS'Y

POWER CORD

POWER CORD COVER

ANALOG PWB

DC-DC PWB

POWER PWB

TERMINAL

BASE

DIGITAL TUNER UNIT

SHIELD TERMINAL

DIGITAL PWB

TUNER BASE

b

c

SPEAKER

SPEAKER

LED PWB

LCD PANEL UNIT

SW PWB

FRONT PANEL

CONTROL

KNOB

The illustration is LT-42DP8 series

a

(No.YA545)1-13

3.1.12 REMOVING THE LCD CONTROL PWB (Fig.3-2) Remove the REAR COVER. Remove the STAND ASS'Y. Remove the STAND BASE SUPPROT. Remove the MIAN BASE.

(1) Remove the 4 screws [A].(2) Remove the LCD CONTROL PWB COVER.(3) Remove the LCD CONTROL PWB.

3.1.13 REMOVING THE INVERTER PWB (Fig.3-2) Remove the REAR COVER.

(1) Remove the 5 screws [B].(2) Remove the INVERTER PWB COVER.(3) Remove the INVERTER PWB.(4) Follow the same steps when removing the other hand

INVERTER PWB.

Fig.3-2

FRONT

LCD CONTROL PWB COVER

INVERTER PWB(MASTER)

COVER

INVERTER PWB(SLAVE)

COVER

B

A

B

LCD CONTROL PWB

INVERTER PWB(SLAVE)

INVERTER PWB(MASTER)

1-14 (No.YA545)

3.2 MEMORY IC REPLACEMENT This model uses the memory IC. This memory IC stores data for proper operation of the video and drive circuits. When replacing, be sure to use an IC containing this (initial value) data.

3.2.1 MEMORY IC TABLE

3.2.2 MEMORY IC REPLACEMENT PROCEDURE1. Power off

Switch off the power and disconnect the power plug from the AC outlet.

2. Replace the memory ICBe sure to use the memory IC written with the initial setting values.

3. Power onConnect the power plug to the AC outlet and switch on the power.

4. Receiving channel settingRefer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.

5. User settingCheck the user setting items according to the given in page later. Where these do not agree, refer to the OPERATINGINSTRUCTIONS and set the items as described.

6. SERVICE MODE settingVerify what to set in the SERVICE MODE, and set whatever is necessary (Fig.3-3). Refer to the SERVICE ADJUSTMENT for setting.

3.2.3 SERVICE MODE SETTINGSERVICE MODE SCREEN

Fig.3-3

SETTING ITEM

3.2.4 SETTINGS OF FACTORY SHIPMENT3.2.4.1 BUTTON OPERATION

3.2.4.2 REMOTE CONTROL DIRECT OPERATION

Symbol Number of pins Mounting PWB Main content of dataIC7201 48-pin DIGITAL PWB Program (Video process) of IC6001(System CPU) is memorized.

IC7602 8-pin DIGITAL PWB Setting value of IC7301(MAIN CPU) is memorized.

Setting items Settings Item No.Video system setting Adjust S001 - S009

(Not used) Fixed T001 - T003(Not used) Fixed M001 - M224(Not used) Fixed F001 - F002(Not used) Fixed D001 (Not used) Fixed Z001

MAIN MENU SCREEN

ADJUSTMENT MODE SCREEN


1. ADJUST 1. ADJUST



S001 R DRIVE 137S001 R DRIVE 137

PAL50 FULL STD HPAL50 FULL STD H

Setting item Setting positionPOWER Off

CHANNEL PR1

VOLUME 10

TV/AV TV

Setting item Setting positionCHANNEL PR1

VOLUME 10

ZOOM Auto

SUB PICTURE EXT-1

SUB POWER Off

(No.YA545)1-15

3.2.4.3 REMOTE CONTROL MENU OPERATION(1) PICTURE

(2) SOUND

(3) FEATURES

(4) SET UP

(5) DTV [LT-42DG8 series only][For UK]

[For other country]

*It differs according to the language that the user selected.

[For All country]

Setting item Setting positionPicture Mode Bright

Colour Temp. Cool

FeaturesSuper Digipure Auto

Movie Theatre Auto

Colour Management On

Picture Management On

Smart Picture On

MPEG Noise Reduction Off

Colour System Main Depends PR

Sub Auto

4:3 Auto Aspect Panoramic

Setting item Setting positionStereo / Iii Stereo Sound

MaxxAudio Low

Balance Centre

Voice Enhancer Off

Setting item Setting positionSleep Timer Off

Child Lock Off (ID:0000)

Appearance Type A

Blue Back On

Favorite Setting Blank

Illumination Bright

Power Lamp On

Eco Mode Off

Setting item Setting positionAuto Program Tv Channel Automatically Set

Edit/manual -

Language English

Decoder (Ext-2) Off

Component Auto Select Off

HDMI HDMI CEC: OnSize: AutoAudio: Auto

Attenuator Off

PC Position Centre

Auto Demonstration Off

Ext SettingS-IN Blank

ID Blank

Dubbing Ext-1 Ext-2

Setting item Setting positionConfigurationAudio Language EnglishSubtitle Language EnglishFavourite Mode OffMenu Lock Disable

Setting item Setting positionConfigurationCountry --- *Menu Language --- *Audio Language --- *Subtitle Language --- *Teletext Language --- *EPG Language --- *Enter PIN Code 0000Favourite Mode OffMaturity Rating Off

Setting item Setting positionSetupDigital Audio Output PCMBanner Duration 2secReceiver Upgrade AutoCommon Interface ---Antenna Power Off

1-16 (No.YA545)

3.3 REPLACEMENT OF CHIP COMPONENT3.3.1 CAUTIONS

(1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern.(3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it.

3.3.2 SOLDERING IRON(1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts.

3.3.3 REPLACEMENT STEPS 1. How to remove Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figure, push the part with tweezers andalternately melt the solder at each end.

(2) Shift with the tweezers and remove the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

(2) As shown in the figure, push the part with tweezers andalternately melt the solder at each lead. Shift and removethe chip part.

NOTE :After removing the part, remove remaining solder from thepattern.

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on thesolder. Then heat and melt the solder at both ends of thechip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the

solder. (3) First solder lead A as indicated in the figure.

(4) Then solder leads B and C.

SOLDER SOLDER

A

B

C

A

B

C

(No.YA545)1-17

SECTION 4ADJUSTMENT

4.1 ADJUSTMENT PREPARATION(1) There are 2 ways of adjusting this TV : One is with the

REMOTE CONTROL UNIT and the other is theconventional method using adjustment parts andcomponents.

(2) The adjustment using the REMOTE CONTROL UNIT ismade on the basis of the initial setting values. Thesetting values which adjust the screen to the optimumcondition can be different from the initial settingvalues.

(3) Make sure that connection is correctly made AC to ACpower source.

(4) Turn on the power of the TV and measuring instruments forwarming up for at least 30 minutes before startingadjustments.

(5) If the receive or input signal is not specified, use the mostappropriate signal for adjustment.

(6) Never touch the parts (such as variable resistors,transformers and condensers) not shown in the adjustmentitems of this service adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENTSUnless otherwise specified in the adjustment items, preset thefollowing functions with the REMOTE CONTROL UNIT.

4.3 MEASURING INSTRUMENT AND FIXTURES Signal generator (Pattern generator) [PAL] Remote control unit

4.4 ADJUSTMENT ITEMS VIDEO CIRCUIT

WHITE BALANCE (HIGH LIGHT) adjustment

4.5 BASIC OPERATION OF SERVICE MODE4.5.1 HOW TO ENTER THE SERVICE MODE

(1) Press [INFORMATION] key and [MUTING] key on theremote control unit simultaneously to enter the SERVICEMODE SCREEN.

(2) In the SERVICE MENU, press the [1] key to displayADJUSTMENT MODE SCREEN.

NOTE: Before enter the SERVICE MODE, press the [MODE] key to

confirm that "TV" position is indicated. If it is in a wrongposition, the SERVICE MODE operation cannot beperformed.

When a number key other than the [1] key is pressed in theSERVICE MODE SCREEN, the other relevant screen maybe displayed.This is not used in the adjustment procedure. Press the[MENU] key to return to the SERVICE MODE SCREEN.

4.5.2 HOW TO EXIT THE SERVICE MODEPress the [MENU] key to exit the Service mode.

4.5.3 SERVICE MODE SELECT KEY LOCATION

Setting item Settings positionPicture Mode Standard

Picture Adjustments Centre

Colour Temp. Normal

Super Digipure Auto

Movie Theatre Auto

Colour Management On

Picture Management On

Zoom Full


1. ADJUST 1. ADJUST



SERVICE MENU SCREEN

[Nunber] key

[FUNCTION

/] key

[MUTING] key

[MODE] key

[INFORMATION] key

[Red] key

[MENU] key

[Green] key

[Function/] key

1-18 (No.YA545)

4.5.4 ADJUSTMENT MODEThis mode is used to adjust the VIDEO CIRCUIT and the MTS CIRCUIT.

4.5.4.1 HOW TO ENTER THE ADJUSTMENT MODEWhen the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE.4.5.5 DESCRIPTION OF STATUS DISPLAY

(1) SIGNAL SYSTEMThe signal displayed on the screen is displayed.

(2) ZOOM MODEState of the SCREEN SIZE or MULTI PICTURE is displayed.SINGLE SCREEN

MULTI SCREEN

(3) PICTURE MODE

(4) COLOUR TEMP.

(5) SETTING ITEM NAMESetting item name are displayed. For the setting item namesto be displayed, refer to "INITIAL SETTING VALUES IN THESERVICE MODE".

(6) SETTING ITEM NO.Setting item numbers are displayed. The setting item numbersto be displayed are listed below.

(7) SETTING VALUE (DATA)The SETTING VALUE is displayed.

4.5.6 CHANGE AND MEMORY OF SETTING VALUESELECTION OF SETTING ITEM

[FUNCTION /] key.For scrolling up / down the setting items.

CHANGE OF SETTING VALUE (DATA) [FUNCTION /] key.

For scrolling up / down the setting values.

MEMORY OF SETTING VALUE (DATA)Changed setting value is memorized by pressing [MUTING]key.

PAL50 : PAL50Hz (Composite / S-video)PAL60 : PAL60Hz (Composite / S-video)SECAM : SECAMNTSC3 : NTSC3.58NTSC4 : NTSC4.43525I : 525i (Component)525P : 525p625I : 625i (Component)625P : 625p1125I5 : 1125i 50Hz1125I6 : 1125i 60HzRGB5 : RGB 525iRGB6 : RGB 625iPCVGA : PC (VGA)PCXGA : PC (XGA)D625I : DVB-T 625iH525I : HDMI 525iH525P : HDMI 525pH625I : HDMI 625iH625P : HDMI 625pH750P : HDMI 750pH125I5 : HDMI 1125i 50HzH125I6 : HDMI 1125i 60Hz--- : OTHER

FULL : FULLPANO : PANORAMIC1609 : 16:9 ZOOM1609S : 16:9 ZOOM SUBTITLE1409 : 14:9 ZOOMREGU : REGULAR

M2 : 2-pictures multiM12 : 12-pictures multi

ADJUSTMENT MODE

SIGNAL SYSTEM ZOOM MODE PICTURE MODE

SETTING VALUE (DATA)SETTING ITEM No. SETTING ITEM

COLOUR TEMP.

S001 R DRIVE 137S001 R DRIVE 137

PAL50 FULL STD HPAL50 FULL STD H

SOFT : SOFTSTD : STANDARDBRI : BRIGHT

H : COOLM : NORMALL : WARM

Item No. Setting itemS001 - S009 Video system setting

T001 - T003 (NOT USED)

M001 - M224 (NOT USED)

F001 - F002 (NOT USED)

D001 (NOT USED)

Z001 (NOT USED)

S001...S009 T001...T003 M001...M224 F001...F002 D001 Z001return to S001

(No.YA545)1-19

4.6 INITIAL SETTING VALUES IN THE SERVICE MODE Perform fine-tuning based on the "initial values" using the remote control when in the Service mode. The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved

may be different from the default values. But, don't change the values that are not written in "ADJUSTMENT PROCEDURE". Theyare fixed values.

4.6.1 VIDEO SYSTEM SETTING

4.6.2 NOT USED ITEM (All values are Fixed values)

Item No. Item Variable range Setting valueS001 R DRIVE 0 - 255 137S002 G DRIVE 0 - 255 137S003 B DRIVE 0 - 255 137S004 RESERV 0 - 255 ---S005 2D YC 0 - 255 0S006 RESERV 0 - 255 ---S007 RESERV 0 - 255 ---S008 RESERV 0 - 255 ---S009 RESERV 0 - 255 ---

Item No. Item Variable range Setting valueT001 RESERV 0 - 15 ---T002 RESERV 0 - 63 ---T003 RESERV 0 - 63 ---M001 1E00 00 - FF ---M002 1E01 00 - FF ---M003 1E02 00 - FF ---M004 1E03 00 - FF ---M005 1E04 00 - FF ---M006 1E05 00 - FF ---M007 1E06 00 - FF ---M008 1E07 00 - FF ---M009 1E08 00 - FF ---M010 1E09 00 - FF ---M011 1E0A 00 - FF ---M012 1E0B 00 - FF ---M013 1E0C 00 - FF ---M014 1E0D 00 - FF ---M015 1E0E 00 - FF ---M016 1E0F 00 - FF ---M017 1E10 00 - FF ---M018 1E11 00 - FF ---M019 1E12 00 - FF ---M020 1E13 00 - FF ---M021 1E14 00 - FF ---M022 1E15 00 - FF ---M023 1E16 00 - FF ---M024 1E17 00 - FF ---M025 1E18 00 - FF ---M026 1E19 00 - FF ---M027 1E1A 00 - FF ---M028 1E1B 00 - FF ---M029 1E1C 00 - FF ---M030 1E1D 00 - FF ---M031 1E1E 00 - FF ---

M032 1E1F 00 - FF ---M033 1E20 00 - FF ---M034 1E21 00 - FF ---M035 1E22 00 - FF ---M036 1E23 00 - FF ---M037 1E24 00 - FF ---M038 1E25 00 - FF ---M039 1E26 00 - FF ---M040 1E27 00 - FF ---M041 1E28 00 - FF ---M042 1E29 00 - FF ---M043 1E2A 00 - FF ---M044 1E2B 00 - FF ---M045 1E2C 00 - FF ---M046 1E2D 00 - FF ---M047 1E2E 00 - FF ---M048 1E2F 00 - FF ---M049 1E30 00 - FF ---M050 1E31 00 - FF ---M051 1E32 00 - FF ---M052 1E33 00 - FF ---M053 1E34 00 - FF ---M054 1E35 00 - FF ---M055 1E36 00 - FF ---M056 1E37 00 - FF ---M057 1E38 00 - FF ---M058 1E39 00 - FF ---M059 1E3A 00 - FF ---M060 1E3B 00 - FF ---M061 1E3C 00 - FF ---M062 1E3D 00 - FF ---M063 1E3E 00 - FF ---M064 1E3F 00 - FF ---M065 1E40 00 - FF ---M066 1E41 00 - FF ---M067 1E42 00 - FF ---M068 1E43 00 - FF ---M069 1E44 00 - FF ---M070 1E45 00 - FF ---M071 1E46 00 - FF ---M072 1E47 00 - FF ---M073 1E48 00 - FF ---M074 1E49 00 - FF ---M075 1E4A 00 - FF ---M076 1E4B 00 - FF ---

Item No. Item Variable range Setting value

1-20 (No.YA545)

M077 1E4C 00 - FF ---M078 1E4D 00 - FF ---M079 1E4E 00 - FF ---M080 1E4F 00 - FF ---M081 1E50 00 - FF ---M082 1E51 00 - FF ---M083 1E52 00 - FF ---M084 1E53 00 - FF ---M085 1E54 00 - FF ---M086 1E55 00 - FF ---M087 1E56 00 - FF ---M088 1E57 00 - FF ---M089 1E58 00 - FF ---M090 1E59 00 - FF ---M091 1E5A 00 - FF ---M092 1E5B 00 - FF ---M093 1E5C 00 - FF ---M094 1E5D 00 - FF ---M095 1E5E 00 - FF ---M096 1E5F 00 - FF ---M097 1E60 00 - FF ---M098 1E61 00 - FF ---M099 1E62 00 - FF ---M100 1E63 00 - FF ---M101 1E64 00 - FF ---M102 1E65 00 - FF ---M103 1E66 00 - FF ---M104 1E67 00 - FF ---M105 1E68 00 - FF ---M106 1E69 00 - FF ---M107 1E6A 00 - FF ---M108 1E6B 00 - FF ---M109 1E6C 00 - FF ---M110 1E6D 00 - FF ---M111 1E6E 00 - FF ---M112 1E6F 00 - FF ---M113 1E70 00 - FF ---M114 1E71 00 - FF ---M115 1E72 00 - FF ---M116 1E73 00 - FF ---M117 1E74 00 - FF ---M118 1E75 00 - FF ---M119 1E76 00 - FF ---M120 1E77 00 - FF ---M121 1E78 00 - FF ---M122 1E79 00 - FF ---M123 1E7A 00 - FF ---M124 1E7B 00 - FF ---M125 1E7C 00 - FF ---M126 1E7D 00 - FF ---

Item No. Item Variable range Setting valueM127 1E7E 00 - FF ---M128 1E7F 00 - FF ---M129 1E80 00 - FF ---M130 1E81 00 - FF ---M131 1E82 00 - FF ---M132 1E83 00 - FF ---M133 1E84 00 - FF ---M134 1E85 00 - FF ---M135 1E86 00 - FF ---M136 1E87 00 - FF ---M137 1E88 00 - FF ---M138 1E89 00 - FF ---M139 1E8A 00 - FF ---M140 1E8B 00 - FF ---M141 1E8C 00 - FF ---M142 1E8D 00 - FF ---M143 1E8E 00 - FF ---M144 1E8F 00 - FF ---M145 1E90 00 - FF ---M146 1E91 00 - FF ---M147 1E92 00 - FF ---M148 1E93 00 - FF ---M149 1E94 00 - FF ---M150 1E95 00 - FF ---M151 1E96 00 - FF ---M152 1E97 00 - FF ---M153 1E98 00 - FF ---M154 1E99 00 - FF ---M155 1E9A 00 - FF ---M156 1E9B 00 - FF ---M157 1E9C 00 - FF ---M158 1E9D 00 - FF ---M159 1E9E 00 - FF ---M160 1E9F 00 - FF ---M161 1EA0 00 - FF ---M162 1EA1 00 - FF ---M163 1EA2 00 - FF ---M164 1EA3 00 - FF ---M165 1EA4 00 - FF ---M166 1EA5 00 - FF ---M167 1EA6 00 - FF ---M168 1EA7 00 - FF ---M169 1EA8 00 - FF ---M170 1EA9 00 - FF ---M171 1EAA 00 - FF ---M172 1EAB 00 - FF ---M173 1EAC 00 - FF ---M174 1EAD 00 - FF ---M175 1EAE 00 - FF ---M176 1EAF 00 - FF ---


(No.YA545)1-21

4.7 ADJUSTMENT PROCEDURE4.7.1 VIDEO CIRCUIT

M177 1EB0 00 - FF ---M178 1EB1 00 - FF ---M179 1EB2 00 - FF ---M180 1EB3 00 - FF ---M181 1EB4 00 - FF ---M182 1EB5 00 - FF ---M183 1EB6 00 - FF ---M184 1EB7 00 - FF ---M185 1EB8 00 - FF ---M186 1EB9 00 - FF ---M187 1EBA 00 - FF ---M188 1EBB 00 - FF ---M189 1EBC 00 - FF ---M190 1EBD 00 - FF ---M191 1EBE 00 - FF ---M192 1EBF 00 - FF ---M193 1EC0 00 - FF ---M194 1EC1 00 - FF ---M195 1EC2 00 - FF ---M196 1EC3 00 - FF ---M197 1EC4 00 - FF ---M198 1EC5 00 - FF ---M199 1EC6 00 - FF ---M200 1EC7 00 - FF ---M201 1EC8 00 - FF ---M202 1EC9 00 - FF ---M203 1ECA 00 - FF ---

Item No. Item Variable range Setting valueM204 1ECB 00 - FF ---M205 1ECC 00 - FF ---M206 1ECD 00 - FF ---M207 1ECE 00 - FF ---M208 1ECF 00 - FF ---M209 1ED0 00 - FF ---M210 1ED1 00 - FF ---M211 1ED2 00 - FF ---M212 1ED3 00 - FF ---M213 1ED4 00 - FF ---M214 1ED5 00 - FF ---M215 1ED6 00 - FF ---M216 1ED7 00 - FF ---M217 1ED8 00 - FF ---M218 1ED9 00 - FF ---M219 1EDA 00 - FF ---M220 1EDB 00 - FF ---M221 1EDC 00 - FF ---M222 1EDD 00 - FF ---M223 1EDE 00 - FF ---M224 1EDF 00 - FF ---F001 DD 0 - 1 ---F002 RAM REF 0 - 1 ---D001 RESERV 0 - 255 ---Z001 RESERV 0 - 255 ---


Item Measuring instrument Test point Adjustment part Description

WHITE BALANCE (HIGHLIGHT)

Remote control unit

Signalgenerator

[1.ADJUST]S001: R DRIVE (Red drive)S002: G DRIVE (Green drive)S003: B DRIVE (Blue drive)

(1) Receive a PAL 75% all white signal.(2) Set PICTURE MODE to "STANDARD".(3) Set ZOOM to "FULL".(4) Set COLOUR TEMP. to "NORMAL".(5) Select "1.ADJUST" from the SERVICE MODE.(6) Adjust to Keep one of (Red drive),

(Green drive) or (Blue drive)unchanged, then lower the other two so that theall-white screen is equally white throughout.

NOTE:Set one or more of , , and to "137".

(7) Check that white balance is properly trackedfrom low light to high light. If the white balancetracking is deviated, adjust to correct it.

(8) Press the [MUTING] key to memorize the setvalue.

1-22 (No.YA545)

SECTION 5TROUBLESHOOTING

5.1 SELF CHECK FEATURE5.1.1 OUTLINEThis unit comes with the "Self check" feature, which checks theoperational state of the circuit and displays/saves it duringfailure.Diagnosis is performed when power is turned on, andinformation input to the main microcomputer is monitored at alltime.Diagnosis is displayed in 2 ways via screen display and LEDflashes. Failure detection is based on input state of I2C bus andthe various control lines connected to the main microcomputer.

5.1.2 HOW TO ENTER THE SELF CHECK MODEBefore enter the SELF CHECK MODE, press the [MODE] key toconfirm that "TV" position is indicated. If it is in a wrong position,the SELF CHECK MODE operation cannot be performed.

(1) Press the [INFORMATION] key and [MUTING] keysimultaneously, then enter the SERVICE MODE.

(2) Press the [2] key SELF CHECK MODE. (3) Press the [RED] key to enter Page 2 of the SELF CHECK

MODE.*Use the [GREEN] key to toggle between Page 1 and Page 2.

NOTE:When a number key other than the [2] key is pressed in theSERVICE MODE screen, the other relevant screen may bedisplayed.This is not used in the SELF CHECK MODE. Press the[MENU] key to return to the MAIN MENU SCREEN.

5.1.3 HOW TO EXIT THE SELF CHECK MODETo Save Failure History:Turn off the power by unplugging the AC power cord plug whenin the Self check display mode.To Clear (Reset) Failure History: Turn off the power by pressing the [POWER] key on the remotecontrol unit when in the Self check display mode.

5.1.4 FAILURE HISTORYFailure history can be counted up to 9 times for each item. Whenthe number exceeds 9, display will remain as 9. Failure historywill be stored in the memory unless it has been deleted.

5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECKFEATURE

In addition to circuit failures (abnormal operation), the followingcases may also be diagnosed as "Abnormal" and counted.

(1) Temporary defective transmissions across circuits due topulse interruptions.

(2) Misalignment in the on/off timing of power for I2C bus (Vcc)when turning on/off the main power.

Therefore, turn on the main power, and then wait for about 3seconds before starting Self check. If recurrences are expected, ensure to clear (reset) the failurehistory and record the new diagnosis results.

Fig.5-1

SERVICE MENU SCREEN



ItemFailure

history


1. ADJUST 1. ADJUST



TMP 0 L 1 0TMP 0 L 1 0

L 2 0 DDT 0L 2 0 DDT 0

FAN 0 L C 0FAN 0 L C 0

IRS 0IRS 0


AUD 0 AUD 0


HOUR 131070 MAX 00HOUR 131070 MAX 00

00 00

Not used

ItemFailure

history

Press [Red] key

Press [2] key

Press [Green] key

(No.YA545)1-23

5.1.6 DETAILSSelf check is performed for the following items: (---- is not used items)

5.1.7 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUTIn the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.

If error is detected, the power is turned off.Shortly after a power is turned off, POWER LED will be blinked.Power cannot be turned on until the power cord takes out and inserts, after a power is turned off.

Detection item Display Detection content Diagnosis signal (line) Detection timing

Low bias line short protection

LOB [LT-42DP8BG/P, LT-42DP8BJ/P]Confirm the operation of the low bias (5V / 12V /13.5V) protection circuit.Q9401, Q9601, Q9703 [DC-DC PWB]

LB_PRO Detection starts 3 seconds afterthe power is turned on. If errorcontinues between 200 ms thepower is turned off.

[LT-42P80BU/P]Confirm the operation of the low bias (5V / 12V /13.5V) protection circuit.Q9401, Q9601, Q9801 [DC-DC PWB]

---- FAN ---- ---- ----

---- AUD ---- ---- ----

Devices on the ANALOG PWB

ANA Confirmation of reply of ACK signal which usesI2C communication.IC101, IC102, IC601, IC3501, TU3001[ANALOG PWB]

SDA Detection starts 3 seconds afterthe power is turned on. If it checkswhenever I2C communication isperformed and no reply of ACKsignal an error will be counted.

Devices on the DIGITAL PWB

DIG Confirmation of reply of ACK signal which usesI2C communication.IC5001 [DIGITAL PWB]

SDA Detection starts 3 seconds afterthe power is turned on. If it checkswhenever I2C communication isperformed and no reply of ACKsignal an error will be counted.

Detection item Display Detection content Diagnosis signal (line) Detection timing

---- TMP ---- ---- ----

---- L1 ---- ---- ----

---- L2 ---- ---- ----

---- DDT ---- ---- ----

---- FAN ---- ---- ----

---- LC ---- ---- ----

---- IRS ---- ---- ----

Type of error POWER LED flash cycleLow bias line short protection POWER LED turnig on and off at 1 second intervals.

(No.YA545)VPT

Printed in Japan

Victor company of Japan, LimitedDisplay category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan

COPYRIGHT 2007 VICTOR COMPANY OF JAPAN, LIMITED No.YA545

2007/8

YA494200611

LT-42DP8BG/P,

LT-42DP8BJ/P,

LT-42P80BU/P

SCHEMATIC DIAGRAMS

CD-ROM No.SML200708

INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION

BASIC CHASSIS

FL5

(No.YA545)2-1

5.NOTE FOR REPAIRING SERVICE

This model's power circuit is partly different in the GND. The

difference of the GND is shown by the LIVE : ( ) side GND and the

ISOLATED(NEUTRAL) : ( ) side GND. Therefore, care must be

taken for the following points.

(1)Do not touch the LIVE side GND or the LIVE side GND and the

ISOLATED(NEUTRAL) side GND simultaneously. if the above

caution is not respected, an electric shock may be caused.

Therefore, make sure that the power cord is surely removed from

the receptacle when, for example, the chassis is pulled out.

(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL)

side GND or never measure with a measuring apparatus measure

with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND

and ISOLATED(NEUTRAL) side GND at the same time.

If the above precaution is not respected, a fuse or any parts will be broken.

Since the circuit diagram is a standard one, the circuit and

circuit constants may be subject to change for improvement

without any notice.

NOTE

Due improvement in performance, some part numbers show

in the circuit diagram may not agree with those indicated in

the part list.

When ordering parts, please use the numbers that appear

in the Parts List.

STANDARD CIRCUIT DIAGRAM

NOTE ON USING CIRCUIT DIAGRAMS

(7)Ground symbol

: LIVE side ground

: ISOLATED(NEUTRAL) side ground

: EARTH ground

: DIGITAL ground

(6)Connecting method

: Connector : Wrapping or soldering

: Receptacle

(5)Test point

: Test point : Only test point display

Respective voltage values are indicated

: B1

: 9V : 5V

: B2 (12V)

(4)Power Supply

Type

MM : Metalized mylar capacitorPP : Polypropylene capacitorMPP : Metalized polypropylene capacitorMF : Metalized film capacitorTF : Thin film capacitorBP : Bipolar electrolytic capacitorTAN : Tantalum capacitor

(3)Coils

No unit

Others

: [H]

: As specified

No indication : Ceramic capacitor

(2)Capacitors

Capacitance value

1 or higher : [pF]

less than 1 : [F]

Withstand voltage

No indication : DC50[V]

Others : DC withstand voltage [V]

AC indicated : AC withstand voltage [V]

Electrolytic Capacitors

47/50[Example]: Capacitance value [F]/withstand voltage[V]

Composition resistor 1/2 [W] is specified as 1/2S or Comp.

Type

No indication : Carbon resistor

OMR : Oxide metal film resistor

MFR : Metal film resistor

MPR : Metal plate resistor

UNFR : Uninflammable resistor

FR : Fusible resistor

4.INDICATIONS ON THE CIRCUIT DIAGRAM(1)Resistors

Resistance value

No unit : []K : [k]M

Rated allowable power

No indication : 1/16 [W]

Others : As specified

: [M]

3.INDICATION OF PARTS SYMBOL [EXAMPLE]

In the PW board : R209 R209

1.SAFETY

The components identified by the symbol and shading are

critical for safety. For continued safety replace safety ciritical

components only with manufactures recommended parts.

Since the voltage values of signal circuit vary to some extent

according to adjustments, use them as reference values.

2.SPECIFIED VOLTAGE AND WAVEFORM VALUES

The voltage and waveform values have been measured under the

following conditions.

(1)Input signal : Colour bar signal

(2)Setting positions of

each knob/button and

variable resistor

(3)Internal resistance of tester : DC 20k/V(4)Oscilloscope sweeping time : H 20s / div

: V 5ms / div

: Othters Sweeping time is

specified

(5)Voltage values : All DC voltage values

: Original setting position

when shipped

LT-42DP8BG/P, LT-42DP8BJ/P, LT-42P80BU/P

SEMICONDUCTOR SHAPES

CONTENTSSEMICONDUCTOR SHAPES ......................................................................2-2WIRING DIAGRAM ........................................................................................2-3BLOCK DIAGRAM........................................................................................2-5CIRCUIT DIAGRAMS....................................................................................2-7

ANALOG PWB CIRCUIT DIAGRAM........................................................................................................... 2-7DIGITAL PWB CIRCUIT DIAGRAM .......................................................................................................... 2-19POWER PWB CIRCUIT DIAGRAM .......................................................................................................... 2-53LED PWB CIRCUIT DIAGRAM................................................................................................................. 2-59SW PWB CIRCUIT DIAGRAM ................................................................................................................. 2-61DC-DC PWB CIRCUIT DIAGRAM............................................................................................................. 2-63

PATTERN DIAGRAMS .............................................................................. 2-65ANALOG PWB PATTERN ........................................................................................................................ 2-65DIGITAL PWB PATTERN ......................................................................................................................... 2-67POWER PWB PATTERN .......................................................................................................................... 2-71LED PWB PATTERN ................................................................................................................................ 2-73SW PWB PATTERN ................................................................................................................................ 2-73DC-DC PWB PATTERN ............................................................................................................................ 2-74

VOLTAGE CHARTS .................................................................................. 2-75WAVEFORMS ............................................................................................ 2-77

USING P.W. BOARD

IC

BOTTOM VIEW FRONT VIEW TOP VIEW

1 N

N1

OUT

E

IN

IN OUTE

1 N

TOP VIEW

1

N

1

N

CHIP IC

TRANSISTOR

BOTTOM VIEW FRONT VIEW TOP VIEW

CHIP TR

E

C

BE C B

C

B EB(G)

E(S)

C(D) E C B

E C B

2-2(No.YA545)

ANALOG P.W. BOARD

SW P.W. BOARD

LED P.W. BOARD

POWER P.W. BOARD

DC-DC P.W. BOARD

DIGITAL P.W. BOARD

SFL-1251A-U2

SFL-7215A-U2

SFL-8721A-U2

SFL-9080A-U2

SFL-9188A-U2

LCA10737-18A(SFL-0D564A)

P.W.B ASSY name LT-42DP8BG/P LT-42DP8BJ/P

SFL-1252A-U2

SFL-8724A-U2

SFL-9193A-U2

LCA10737-19A(SFL-0D565A)

LT-42P80BU/P

2-4(No.YA545)(No.YA545)2-3

21

91

10

1

1 10

15

14

12

1

14

13

12

41

1

50

140

1

CN00R

CN00U

CN0SR

CN001

CN002 CN0LV1

CN0SL

CN200R

91

CN100U

F9001250V/6.3A

CN00W

CN00P

CN00F

CN00A

CN0PW

114

15

1

1 15

CN00A

CN0DC

123

CN00H

123

CN00H

CN10F

ANALOG

TUNER

1 15CN0DC

112

CN000W

150

140

CN001

CN002

INVERTER PWB

(SLAVE SIDE)

INVERTER PWB

(MASTER SIDE)

CN00Q

110

13

1

CN0UV

16

CN0ID

PL302

101

CN0UD

PL301PL103

1 6 1 131 10TOP

DIGITAL TUNER MODULE PWB

[only LT-42DP8 series]




LED PWB

DC-DC PWB

TOP

TOP

FRONT

TOP TOP

TOP

TOP

DIGITAL PWB

ANALOG PWB

SW PWB

POWER PWB

POWER CORD

SPEAKER (R) SPEAKER (L)LCD PANEL UNIT

CONTROL PWB

WIRING DIAGRAM

(No.YA545)2-5 2-6(No.YA545)

DEC_Y

V1_VIN

V2_VIN

V3_VIN

V1_YIN

V1_CIN

V2_CIN

V3_CIN

DTU_LIN/RIN

DIN_L/R

TV_L/R

V1_LIN/RIN

V2_LIN/RIN

V3_LIN/RIN

V4_LIN/RIN

V2_YIN

V3_YIN

MON_L/R

FIX_L/R

IC6001

D8771/D8772

S7807

J7101

IC751

IC8772

IC8771EE_CDS

POWER_LED

REMOCON

HP_L/R

MECA_SW

KEY_1/2

IC6001 IC5001

IC6101

IC7201

IC7203

DQADRS

SD_DQ1-32

A0-21

D0-15

A0-21

D0-15

TU3001

UHF/VHF TUNER

IC102

Y_OUT

BY_OUT

RY_OUT

SUB_C

MAIN_C

IC101

MAIN_VY

SUB_VY

Y/CMIX

IC601

AMP_L/R

S7801S7806

E.E. SENSOR

DTU_Y/Cb/CrDTU_VINDTU_LIN/RIN

HDMI

RECEIVE

DV1_R0-7

DV1_Y0-7

DV1_B0-7

SUB_VY

YM_IN/

BYM_IN/

RYM_IN

HDMI

HDMI

DIN_DL/DR

IC7301IC7602

MI_TX/MI_RX/MI_CLK

OSDR1-5/OSDG1-5/OSDB1-5

IC5002IC5003

FRAME INTERPOLATE/LCD CONTROL/

LVDS DRIVE

SUB_C

V4_Cb

V4_Cr

V4_Y

DTU_Cb

DTU_Cr

DTU_Y

B1

R1

G1

B2

R2

G2

PC_B

PC_R

PC_G

MAIN_C

MAIN_VY

RE(0)P/NRE(1)P/NRE(2)P/NRE(3)P/NRECLK+/-

MAIN_L/R

LVR0-7/LVG0-7/LVB0-7

ANALOG PWB

DIGITAL PWB

SW PWB

LED PWB

POWER

IR RECEIVE

HEADPHONE

CONTROLSWITCH

POWER

SPEAKER (R)

SPEAKER (L)

LCD PANEL

DIGITAL

TUNER

MODULE


VIDEO/AUDIO SELECT

VIDEO SELECT

PROGRAMMEMORY

PROGRAMMEMORY

FRAMEMEMORY

YC SEPARATE/CHROMA DEMODURATE/FORMAT CONVERT/NOISE REDUCT/RGB PROCESS/OSD COMPOSITION/SUB CPU

MAIN CPUMEMORY

AUDIO OUT

HEADPHONEAMP

AUDIO CONTROL

YC SEPARATE/CHROMA DEMOD./

FORMAT CONVERT/NOISE REDUCT

RGBPROCESS

OSDMIX

SUB CPU

A-D CONVERT

A-D CONVERT

A-DCONVERT

D-ACONVERTVOLUME

BASSBOOST

TREBLEBOOST

STEREOBOOST EQUALIZE

V

L/R

EXT-3

AUDIO OUT L/R

PC INPUT

S-VIDEO

Y

Pb/Cb

Pr/Cr

EXT-1

EXT-4

EXT-2

L/R

FRAMEMEMORY

RO(0)P/NRO(1)P/NRO(2)P/NRO(3)P/NROCLK+/-

EXT-5

EXT-6

UKD_TXUKD_RX

MAIN_CCD

TEXT_R/G/B

TEXT_G

TEXT_B

TEXT_R

MON_VOUT

DTU_VIN

MON_V

MON_L/R

MON_V

V1

Y1/C1

L1/R1

Y4/CB4/CR4

R1/G1/B1

R2/G2/B2

Y2/C2

L2/R2

V2

L3/R3

V3

L4/R4

PC_R/G/B

Y3/C3

TV_MAIN

MON_TV

TV_L/R

D-AA-DAGC DEMOD.

IC3501 MULTI SOUND PROCESS

MATRIX TV_L/RTV_SIF

TV_MONO

IC105VIDEO AMP

IC104

VIDEOAMP

Y/CMIX

BLOCK DIAGRAM

2-8(No.YA545)(No.YA545)2-7

ANALOG PWB ASS'Y(1/6)SFL-1251A-U2 [LT-42DP8BG/P, LT-42DP8BJ/P]

SFL-1252A-U2 [LT-42P80BU/P]

c10520001b002_0702_2/6_0.0

R3021

R3022

TU3001

R3013

SDA3A5

SCL3A5

R3004C3006

C3015

R3023

L3001

MSP_RSTO

C3505

R3001

C3005

C3011

C3004

K3001

Q3001

R3006

C3019

C3018

TU3001

C3010

R3017R3005

Q3004

C3008L3002

TV_MAIN

C3501

C3536

C3007

C3002

R3015

IC3504

C3530

C3544 C3546

R3024

R3016

R3014

R3003

R3517

C3016

C3518

Q3503

L3004

C3014

R3018

R3019C3017

C3012 C3013C3009

R3008

C3001

R3009

R3010R3012

R3002

R3011

Q3003

C3003

Q3005

R3020

TV_L

TV_R

AFT1

AGC1

R3025

D3501

C3545

K3501

C3533

C3532

C3535

C3534

C3523C3524

K3502

IC3501

X3501

C3502

C3537

C3531

C3529

C3525 C3526

R3516

C3517

C3515

LC3501 L3504

C3516

R3515

R3514

L3503

R3510

C3528

L3003

R3546

R3547

C3547

C3513

C3512

C3503 R3509

C3514

OPEN

OPEN 1k

100

1

OPEN

OPEN

OPEN

OPEN

OPEN

.01

OPEN

PNP

0

.01

.01

1501K

NPN10

*5

*5

.1/50

100

2.2k

OPEN

*5

1 1

OPEN

1k

180

100

10k

18p

2200p

47p

47

270.01

820p 47p10

0

.1

2.2k

1k330

100

680

NPN

OPEN

NPN

1k

100K

OPEN

OPEN

OPEN

.1

.1

.001.001

.1

.1

.1

10

10 .01

100

.01

.1 100

100

100

OPEN

OPEN

0 0

OP

EN

2p

.01

.01

OP

EN

2p

BS_A5V

GND

SDA3A5

SCL3A5

AFT1

GND

32V

AGC1

BS_A9V

TV_MAIN

TV_L

TV_R

GND

BS_A5V

MSP_RSTO

BS_A9V

GND

SHEET 2

SHEET 2

SHEET 2,3

SHEET 2,3,6

UHF/VHF TUNER

MULTI SOUND PROCESS

CIRCUIT DIAGRAMS ANALOG PWB CIRCUIT DIAGRAM (1/6) [TU/MSP BLOCK] SHEET 1

(No.YA545)2-9 2-10(No.YA545)



c10520001b001_0702_1/6_0.0

V2_YS

R277

C211

SCL3A5

SDA3A5

V4_LIN

CN002

V2_G_Y

V2_B_Cb

V2_SL

V2_R_Cr

V1_SL

R230

V4_RIN

AMP_MUTE

CARD_CK

CN00U

V2_LIN

V1_G_Y

CARD_DA

CN0UV

R228

D283

R279

R274

R275

C261

C264

R241

K106

R183

R243

CN00R

SDA3A

SCL3A

R251

K107

R255

K108

FIX_R

K103

R259

FIX_L

V1_B_Cb

TV_LINK

R236

IC104

C148

C213

R224

CNCV2

C150

C151

C212

R206

Q107

Q106

D284

CNCV1

V3_CIN

HP_L

C149

R260

V1_YIN

R276 R261

D290

V3_YIN

HP_MUTE

K105

HP_R

HP_DET

Q110

C194

R262

R264

R207

R266

R263

R265R267

Q111

Q112

R278

C195

PC_R

Q109

C196

D105

PC_G

PC_B

PC_HS

PC_VS

C290

R290

R205

IC541

R538

R535

C533

IC105

C152

C154

C155C153

D503

K104

K102

K101

A_MUTE

R269

M_MUTE

R221

CN0UV

Q114

R268

R269

R270

R271

R584

R585

Q115

R203

R204

R222

M_PACK

C194

C195

C196

Q108

R223

R225

C166

C197

C198

R270

R268

V1_LIN

V3_VIN

V3_LIN

V3_RIN

R197

DIN_PHOTO

V2_RIN

V2_VIN

V1_R_Cr

V1_RIN

V1_YS

V1_VIN

V1_CIN

MON_R

MON_L

MON_V

MON_TV

C207

C199

C208

CN001

C200

C201

C202

C118

C207

C208

C209

C210

R584

R585

R586

R587

V4_R_Cr

V4_B_Cb

V4_G_Y

V2_YIN

V2_CIN

R271

C125

C124

C121

R163

R162

R161

IC101

IC102

R164

C119

R165

C120

R166

C126

R167

C132R181

C143

C142

C133

C141

R189

C138

R184

R188

C173

C171

C170

C169

C172

R242

R250

R254

C176 C174

C175

R238

R239

R245

R246

R247

R248

R252

R256

C189

C168

C167

C186

C187

C177

C123

C122

C117

D101 D102

R169 R168

C131

C130

R237

C134

MAIN_L

MAIN_R

C139

C263C262

C184

R231 C185

Q113

R232

L101

R229

R288

R289

R293

R294

TV

_R

TV

_L

TV

_M

AIN

R3

05

MA

IN_

PO

W

R3

06

R2

01

M_

MU

TE

A_

MU

TE

R1

71

AG

C1

MA

XX

_R

ST

R3

08

C1

61

R3

07

AC

_IN

PO

W_

GO

OD

R1

70

C1

27

MS

P_

RS

TO

R2

02

R208

C1

06

C216

C217

C218

C219

C220

R209

R210

R2

11

R2

12

R2

13

R3

10

R3

11

R3

12

10

80

P_

SW

B1

_P

OW

R2

15

R3

09

R2

74

AF

T1

C1

16

R1

40

R1

41

R1

43

R1

44

R3

00

R1

46

R1

47

R3

03

R3

04

R3

02

R3

01

R1

48

R1

49

C1

07

R1

51

C1

08

R1

52

R1

53

R1

54

R1

55

R1

50

R1

57

R1

45

R1

56

R1

58

R1

59

R1

60

R235

R234

R1

42

C1

28

C1

29

R233

C1

56

C1

57

C1

58

R2

16

R2

17

R2

18

C183

C182

C181 C178

D1

03

D1

04

R2

19

R2

20

C180

C179

L1

04

L1

03

L1

02

C2

82

C2

83

C2

84

C2

85

C2

86

C2

87

R1

90

R1

91

R1

92

C2

91

C2

92

C2

93

0OPEN

OPEN

330

0

OPEN

0

0.1

0.1

0

82k

0

15k

15k

0

330

1

2.2

OPEN

OPEN

100

10

2.2

5.6k

OPEN

10

100

02.7k

OPEN

OPEN

PNP2

100

100

5.6k

100

330

330

330

PNP2

PNP2

0

PNP2

OPEN

OPEN

OPEN

1k

100

0.1

1

100

1010

OPEN

OPEN

OPEN

0

0

0

OPEN

OPEN

OPEN

OPEN

75

75

75

75

10k

10k

OPEN

OPEN

10/10

10/10

10/10

0

2.2/16

2.2/16

0.1

OPEN

OPEN

0.1

0.1

0.1

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN

1

OPEN

OPEN

OPEN

OPEN

OPEN

1

1

1

OPEN

OPEN

0

220k

1

220k

1

220k

1

220k

1220k

0.1

0.1

1

10

0

0.01

220k

10k

68p

0.01

0.01

0.01

0.022

330

22k

22k

0.01 330p

OPEN

0

0

0

0

0

0

0

0

10

0.1

0.1

OPEN

0.1

0.1

0.1

0.1

0.1

OPEN OPEN

100 100

0.1

47

0

1

1

0.10.1

150p

33 82p

NPN

470

OPEN

75

75

75

0

OP

EN

OP

EN

OP

EN

10

0

5.6

K

.01

5.6

K

OP

EN

10

5.6

K

OP

EN

4.7

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

0

OP

EN

10

6.8

k

6.8

k

6.8

k

6.8

k

0

OP

EN

OP

EN

6.8

k

6.8

k

0.16.8

K

476

.8K

6.8

k

6.8

k

OP

EN

33

K

33

K

33

k OP

EN

0 0 0

0 0

10

k

0.1

0.1

0

0.0

1

0.0

1

0.0

1 0 0 0

0.0

1

0.0

1

0.0

1

1

OP

EN

OP

EN

10

0

10

0

0.1

47

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

OP

EN

0 0 0

DTU_Cb

DTU_LIN

BS_A5V

A_MUTE

DTU_Cr

V4_RIN

V4_LIN

PC_R

V2_YIN

V2_R_Cr

V2_LIN

V1_G_Y

DTU_Y

V2_SL

V2_B_Cb

GND

MON_R

MON_L

MON_V

M_PACK

MON_TV

V2_RIN

V4_G_Y

V4_B_Cb

V4_R_Cr

V2_CIN

V3_RIN

V3_YIN

V2_G_Y

V2_YS

V2_VIN

AMP_MUTE

V3_YIN

CARD_DA

V3_CIN

V1_SL

DBS__LED2

V1_B_Cb

V1_R_Cr

V1_RIN

V1_YS

V3_CIN

V1_VIN

V1_LIN

V1_CIN

V3_VIN

GND

V1_YIN

DTU_RIN

CARD_CK

DTU_Y

V1_SL

DTU_Cb

SDA3A

MECA_SW

V2_SL

BS_A5V

BS_A9V

GND

GND

GND

V1_YS

BS_A3.3V

DTU_Cr

PC_R

KEY2

KEY1

HP_MUTE

PC_B

PC_G

V2_YS

V3_LIN

V2_R_Cr

V2_B_Cb

BS_A9V

V2_G_Y

PC_HS

M_MUTE

FIX_R

FIX_L

V3_VIN

TV_LINK

PC_B

GND

PC_VS

PC_G

GND

DTU_YIN

GND

DTU_CIN

GND

STB3.3V

STB_5V

BS_A5V

STB3.3V

BS_A5V

REC_LED

GND

DIN_R

GND

DIN_L

DIMMER

FIX_R

GND

GND

GND

FIX_L

SCL3A

DIN_PHOTO

BS_A5V

GND GND

BS_A5V

GND

GND

M_PACK

POW_LED

REMOCON

DBS__LED1

STB_5V

EE_CDS1

GND

BS_A5V

GND

GND

BS_A5V

GND

DTU_VIN

GND

BS_A5V

GND

BS_A9V

GND

CARD_RIN

DIN_R

CARD_LIN

GND

MAIN_VY

MAIN_C

SUB_C

BS_A5V

GND

MON_L

MON_R

BS_A5V

GND

DTU_CIN

MON_VOUT

BS_A5V

GND

GND

DTU2_RIN

DTU2_LIN

BS_A5V

BS_A5V

BS_A5V

GND

BS_A5V

BS_A9V

BS_A5V

GND

B1

_P

OW

TV

_M

AIN

CA

RD

_LIN

AM

P_

MU

TE

B1

_P

OW

V4

_R

_C

r

TV

_M

AIN

DT

U_V

IN

DE

C_Y

HP

_M

UT

E

V1_V

IND

IMM

ER

V1_Y

IN

DE

C_Y

A-M

UT

E

MO

N_

VO

UT

CA

RD

_R

IN

RE

MO

CO

N

AU

DIO

_R

MO

N_

TV

CA

RD

_C

r

CA

RD

_V

D

CA

RD

_H

D

TV

_R

TV

_L

CA

RD

_C

b

AU

DIO

_R

CA

RD

_Y

MA

IN_

VY

CA

RD

_C

r

RE

C_LE

D

EE

_C

DS

1

SC

L3

A

CA

RD

_H

D

DT

U2

_R

IN

CA

RD

_V

D

MO

N_V

V1_Y

S

PO

W_LE

D

TE

XT

_R

ME

CA

_S

W

KE

Y2

TE

XT

_G

CA

RD

_C

b

CA

RD

_Y

TE

XT

_B

V3

_L

IN

V3

_R

IN

A-M

UT

E

PO

W_

GO

OD

SD

A3A

1080P

_S

W

1080P

_S

W

CA

RD

_D

A

TV

_LIN

K

AC

_IN

V1_C

IN

MA

IN_

PO

W

MS

P_R

ST

O

MA

IN_

PO

W

V2_V

IN

AC

_IN

PO

W_

GO

OD

MS

P_R

ST

O

TE

XT

_R

KE

Y1

DB

S_

_L

ED

1

DB

S_

_L

ED

2

V2_Y

S

MA

XX

_R

ST

MA

XX

_R

ST

V2_Y

IN

V2_C

IN

TV

_M

AIN

V4

_B

_C

b

V4

_G

_Y

PC

_H

S

PC

_V

S

SU

B_C

MA

IN_C

DIN

_P

HO

TO

DT

U_R

IN

TV

_L

TV

_R

DT

U2

_L

IN

DT

U_

LIN

DIN

_L

V1

_L

IN

V1

_R

IN

V2

_L

IN

V2

_R

IN

V4

_L

IN

V4

_R

IN

TE

XT

_B

TE

XT

_G

V1

_G

_Y

V1_B

_C

b

V1_R

_C

r

CA

RD

_C

K

SHEET 1SHEET 1,3

SHEET 1

SHEET 5

SHEET 1,3,6

SHEET 5

SHEET 3

SHEET 3

SHEET 5

SHEET 5

SHEET 3,5

SHEET 3,5SHEET 6

OPEN OPEN

DIGITAL PWB(1/17) CN001

(SHEET 7)

LED PWBCN100U

(SHEET 27)

SW PWBCN200R

(SHEET 28)

DIGITAL PWB(5/17) CN002 (SHEET 11)

DIGITAL TUNER MODULE PWB [only LT-42DP8 series]

VIDEO/AUDIO SELECT VIDEO SELECT

VIDEO AMPVIDEO AMP

ANALOG PWB CIRCUIT DIAGRAM (2/6) [AV SW BLOCK] SHEET 2

2-12(No.YA545)(No.YA545)2-11



c10520001b005_0702_5/6_0.0

C426

C427

C424

C425

C415

C416

Q435

D413

J403

D403

R491

MON_TV

D404

D405

D406

D407

D440

D441

C406

C405

C404

C403

D408

C420

C421

C422

C491

C492

C493

R421

R422

R423

D491

D423

D425

C410

D445

D424

J406

Q434

C445

C444

D444

D442

C440

C412

C413

C442

R410

R413

R414

C443

R412

C409

D411

R411

C411

D414

D412

D416

D415

D443

D422

D421

C419

C418

R419

R420

C402

C401

J410 C463

C462

C461 C464

D402

D401

V2_RIN

V2_CIN

V2_R_Cr

V2_SL

TV_LINK

Q438

C465

C466

SDA3A5

SCL3A5

V1_YS

TV_L

D463

V1_G_Y

V1_B_Cb

V1_CIN

V2_YS

V2_YIN

C433

V2_G_Y

V2_B_Cb

TV_R

D431

D432

D467

D468

MON_V

MON_L

C431

C432

A_MUTE

MON_R

V4_LIN

V4_RIN

R438

R441

Q437

M_MUTE

Q431

Q432

R440

R443

R439

R444

J405

R464

Q433

R442

R437

R467

R461

V3_YIN

V3_CIN

C494

V4_G_Y

V4_B_Cb

V4_R_Cr

D462D461

C456

D469

M_PACK

DIN_PHOTO

V3_RIN

V3_LIN

V3_VIN

R475 D465 D466

FIX_L

FIX_R

M_MUTE

V1_YIN

V1_VIN

V1_R_Cr

V1_LIN

V1_RIN

V1_SL

V2_VIN

V2_LIN

R476

D492

PC_HS

PC_R

PC_G

PC_B

C469

PC_VS

C468

D428

D427

R406

C455

C457

C451

Q444

Q445

R426

R427

C450

C449

R451

C448

R452

R453

R454

C428

C430

C429

C417

R404

R403

R402 D409 R405

R401

R450

J401

J402

D447 D446

C407

C441

C408

C446

C447

R488

R489

R487

R483

R484

R482Q439

R485

R486

C452

C453

C454

R457

R459

R455

R460

R446

R447

R445Q436

R448

R458

R456

R462

D470

OPEN

OPEN

OPEN

OPEN

1500p

1500p

*1

*2

1M

*2

*2

*1

*1

*1

*1

2.2

2.2

2.2

2.2

*1

2.2

2.2

2.2

10

0.1

100

75

75

75

*2

*2

.01

*2

*2

2.2

2.2 *2

*1

2.2

2.2

2.2

2.2

75

220k

220k

2.2

75

2.2

*1

75

2.2*1

*1

*1

*1

*2

*1

*1

2.2

2.2220k

220k

2.2

2.2

100p

100p

100p

2.2

*1

*1

2.2

2.2

*2

1

*1

*1

*1

*1

4.7

4.7

82K

82K

220

1k

680

39k

75

680

220

75

75

1000p

*2*2

1

*1

1K *2 *21K100p 100p

*1

*1

68

2.2

2.2

AV_GND

1500p

NPN

NPN

10K

10K

1500p

1500p

75

1500p

75

75

75

1500p

1500p

1500p

1500p

75

75

75 *1 75

75

75

*1 *1

2.2

2.2

2.2

2.2

2.2

82K

82K

220

3.3K

680

39k

680

220

1

2.2

2.2

82K

82K

2.2k

220

3.3K

680

39k

680

220

68

OP

EN

FIX_L

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND

V1_R_Cr

V4_G_Y

GND

V1_G_Y

MON_TV

GND

V1_B_Cb

V2_YS

GND

GND

GND

GND

GND

GND

GND

V3_YIN

V3_VIN

GND

V3_LIN

GND

V4_B_Cb

V3_RIN

V4_R_Cr

BS_A5V

GND

GND

GND

GND

V3_CIN

GND

V4_LIN

GND

GND

GND

V4_RIN

GND

GNDGND

GND

GND

GND

FIX_R

GND

V2_YIN

V2_CIN

GND

V2_R_Cr

GND

GND

GND

GND

GND

GND

GND

V2_LIN

GND

GND

GND

GND

GND

V1_CIN

GND

V1_YS

FIX_L

GND

GND

GND

TV_LINK

V1_VIN

GND

GND

M_MUTE

GND

V1_YIN

GND

V2_B_Cb

V1_LIN

FIX_R

GND GND

V1_RIN

Documents

Jvc Lcd Lt-42dp8b Lt-42p80bg_p Chassis Fl5