LG MDD62 service manual

5/19/2018 LG MDD62 service manual

1/69

KARAOKE MINI

HOME THEATERSERVICE MANUAL

MODEL : MDD62(MDS62V)

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS

IN THIS MANUAL.

MODEL:MDD62(MDS62V)

SERVICEMANUAL

http://biz.lgservice.com

P/NO : AFN33894956 MAY, 2007


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CONTENTS

SECTION 1GENERALSERVICING PRECAUTIONS ......................................1-2

NOTES REGARDING HANDLING OF THE PICK-UP NOTES REGARDING COMPACT DISC PLAYER REPAIRS

ESD PRECAUTIONS ...................................................1-4

LOCATION OF USERS CONTROLS.........................1-5

SPECIFICATIONS ........................................................1-7

SECTION 2EXPLODED VIEWSCABINET AND MAIN FRAME SECTION ..................2-1

TAPE DECK MECHANISM EXPLODED VIEW ........2-31. TAPE DECK MECHANISM

(A/S & A/S : RIGHTA/S DECK)........................2-32. TAPE DECK MECHANISM(A/S & A/S : LEFT A/S DECK) ...........................2-5

DVD MECHANISM EXPLODED VIEW ......................2-7

SPEAKER EXPLODED VIEW ....................................2-9MODEL : MDS62V ...................................................2-9

PACKING ACCESSORY VIEW.................................2-13

WIRING DIAGRAM ....................................................3-22

BLOCK DIAGRAM.....................................................3-24

1. SMPS BLOCK DIAGRAM...............................3-24

2. MAIN & FRONT BLOCK DIAGRAM ..............3-26

SCHEMATIC DIAGRAMS .........................................3-28

1. SMPS SCHEMATIC DIAGRAM.......................3-28

2. MAIN SCHEMATIC DIAGRAM........................3-30

3. AMP SCHEMATIC DIAGRAM..........................3-32

4. DECK SCHEMATIC DIAGRAM.......................3-34

5. FRONT SCHEMATIC DIAGRAM.....................3-36

PRINTED CIRCUIT DIAGRAMS...............................3-38

1. MAIN P.C.BOARD............................................3-38

2. SMPS P.C.BOARD ..........................................3-42

3. FRONT P.C.BOARD ........................................3-44

SECTION 4

DVD PART ELECTRICALDVD ELECTRICALTROUBLESHOOTING GUIDE....................................4-1

1. POWER CHECK GUIDE...................................4-12. TEST & DEBUG FLOW.....................................4-23. USB PART..........................................................4-7

WAVEFORMS ...............................................................4-8O O


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NOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and storage

1) The pick-up should always be left in its conductive bag until immediately prior to use.

2) The pick-up should never be subjected to external pressure or impact.

2. Repair notes1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and

impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or

damage to the printed-circuit board.3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason

the adjustment point and installation screws should absolutely never be touched.4) Laser beams may damage the eyes!

Absolutely never permit laser beams to enter the eyes!

Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

SERVICING PRECAUTIONS

SECTION 1 GENERAL


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NOTES REGARDING COMPACT DISC PLAYER REPAIRS1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components

are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components

can be damaged, and for that reason components should be handled with care.2) The pick-up is composed of many optical components and other high-precision components. Care must be

taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong

magnetism is present, or where there is excessive dust.

2. Notes for repair1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded.

When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is

because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.5) Workers should be grounded by an armband (1M)6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent

static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.


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ESD PRECAUTIONS

Electrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components

commonly are called electrostatically sensitive devices (ESD). Examples of typical ESD devices areintegrated circuits and some field-effect transistors and semiconductor chip components. The followingtechniques should be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drainoff any electrostatic charge on your body by touching a know earth ground. Alternatively, obtain andwear a commercially available discharging wrist strap device, which should be removed for potential

shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductivesurface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static"can generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-propelled chemicals These can generate electrical charges sufficient to damage ESD

devices.6. Do not remove a replacement ESD device from its protective package until immediately before you are

ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together

by conductive foam, aluminum foil or comparable conductive materials).

7. Immediately before removing the protective material from the leads of a replacement ESD device, touchthe protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT,AND OBSERVE ALL


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LOCATION OF USERS CONTROLS

FRONT / BACK PANEL

1

3

45

6

7

8

9

10

11

12

13

2

1. NUMERIC buttons (0-9)

2. DISC DOOR

3. ( ) POWER button

OPEN/CLOSE button

4 DISPLAY WINDOW

7. PUSH EJECT position (TAPE 1)

PUSH EJECT position (TAPE 2)

8. MIC VOLUME knob : OPTIONAL

MIC Jacks (MIC1/ MIC2): 3.5mm : OPTIONAL

9 DISC SELECT buttons (1 2 3)


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1. POWER button

2. FUNCTION SELECT buttons

(TUNER / BAND, DVD / KARAOKE, AUX, USB)

3. NUMERIC buttons (0-9)

4. TAPE FUNCTION buttons

PLAY ( )

REWIND / FAST FORWARD PLAY ( )

TAPE 1-2 SELECT buttons (1-TAPE-2) RECORD / RECORD PAUSE ( / )

TAPE STOP ( )

5. SET UP button

6. ARROW buttons ( / )

(Selects an option in the menu)

PRESET (-/+) buttons ( )

TUN. (-/+) buttons ( )

7. SELECT / ENTER button

8. MENU button

(Use the MENU button to display the menu screen

included on DVD video discs.)

9. STOP ( ), PAUSE( ) / STEP, PLAY ( ) buttons

10.PROG. / MEMO., REPEAT, REPEAT A-B buttons

11 EQ XTS-Pro SOUND / FEMALE( )

REMOTE CONTROL


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SPECIFICATIONS

GENERAL

Power supply Refer to the main label.Power consumption Refer to the main label.

Net Weight 5.4kg (MDD102)

5.32kg (MDD 62)

External dimensions (W x H x D) 273 X 371 X 326mm

TUNER / AMPLIFIER

FM Tuning Range 87.5 ~ 108.0MHz or 65 ~ 74MHz, 87.5 ~ 108.0MHz

Intermediate Frequency 10.7MHz

Signal to Noise Ratio 60/55dB (Mono/Stereo)

Frequency Response 50 ~ 10000Hz

AM Tuning Range 522 ~ 1620kHz or 520 ~ 1720kHz

Intermediate Frequency 450kHz

Signal to Noise Ratio 30dB

Frequency Response 140 ~ 1800Hz

Output Power 50W + 50W (4, THD 10%)

T.H.D 0.5%

Frequency Response 40 ~ 20000HzSignal-to-noise ratio 75dB

DVD/VCD/CD PLAYER CASSETTE TAPE PLAYER

Frequency response (audio) 40 ~ 20000Hz Tape Speed 3000 3% (MTT-111.

Signal-to-noise ratio (audio) More than 75dB (1kHz) NORMAL-SPEED)

Signal-to-noise ratio (video) More than 55dB (1kHz) Wow Flutter 0.25%

Dynamic range (audio) More than 80dB (MTT-111, JIS-WTD)


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MEMO


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BRASS MOTORPULLEY MAYBE CHANGED

FORWOW FLUTTERWHENNECESSARY

RING FW MAYBE ADDED


001

002

006

007

008

016 017

018

019

020

003

A00

009

009

A02

A01

011

013

022

025

015

023

TAPE DECK MECHANISM EXPLODED VIEW

1. TAPE DECK MECHANISM (A/S & A/S : RIGHT A/S DECK)


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RING FW MAYBE ADDED


013

011

009

009

003

008

015

022

023

024

016 017

018

019

020

007

A03

A00

2. TAPE DECK MECHANISM (A/S & A/S : LEFT A/S DECK)


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SPEAKER EXPLODED VIEW

A80

851

852

850

854

856

856

855

853

A80A

857

857

WIRE80

A80B


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2-11 2-12

MEMO MEMO


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PACKING ACCESSORY VIEW


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AUDIO ELECTRICAL TROUBLESHOOTING GUIDE

SECTION 3 AUDIO PART ELECTRICAL

1. POWER (SMPS)

No .5.6VA

YES

Is the F101 normal? Replace the F101 (Use the same fuse)

YES

NO

Is the BD101 normal? Replace the BD101

YES

NO

Is the TH101 normal? Replace the R101

YES

NO

Is Vcc (9V - 18V)

supplied to IC101 Pin2?

Is the D102 normal?

YES

NO

NO

Check or Replace the D102

IS the D959 normal? Replace the D959

YES

NO


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No 5.0V

Is the Vcc(5.6V)supplied to IC957 pin1? Check or Replace the D959

YES

YES

NO

Is the IC957 pin4 H?Check the CD CTL H

signal from -com

YES

NO

Check or Replace the IC957

No 3.3V

Is the Vcc(4.2V)supplied to IC955 pin1? Check or Replace the D943

YES

YES

NO

Is the IC955 pin4 H?Check the P CTL H

i l f

NO


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No -12V

Is the voltage 0fC932 -13V

Check or Replace the D970

YES

YES

NO

Is the IC155 pin212V?

Check the PWR CTLH signal from -com

YES

NO

Check or Replace the Q942

No VF+

Is the ZD950Normal?

Replace the ZD950

YES

YES

NO

Replace the R993 or Q950, Q943


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MICOM part check I

YES

YES

YES

Check P-SENS(P7904)_PIN6.

NO Refer toSMPS troubleshooting.

YES

YES

Check bothend voltage of IC101

(KIA7042).

Checkif input voltage of

IC101(KIA7042) isover 5V.

YES

NO Check theperiphery of IC101

(KIA7042).

NO

YES

Check if IC101(KIA7042) ofoutput voltage is over 4.3V.

Check voltage of IC10078KO/KF2_PIN1.

NO Replace IC101(KIA7042).

2. MICOM PART CHECK I


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3. MICOM PART CHECK II

MICOM part check II

CheckCheck Q102 base

NO NO

YES

YES

Check ifvoltage of P7904_PIN5

is 5.6V.


YES

Checkboth end voltage of

D101

YES

YES

Check D101.

NO Check if output ofD101(1SR35) is 5V.

OK

Check if output of IC101

NOReplace D101.


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CheckIC100(78KOKF2)_

PIN 22, 24

OK

YES

YES

Refer tomicom troubleshootingCheck micomvoltage 5V.PIN22DATA PIN24 CLK

NONO

YES

Replace micom.Check micom.NO

YES

OK

4. IC103(KS4CD21CS) CHECK


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FLD display check

YES

Replace P3702.Check eachPIN voltage.

NO

NO

YES

YES

OK

Refer to SMPS

5. FLD DISPLAY CHECK

YES

YES

CheckP7904_PIN1, 2, 3 voltage

input.

NOCheck P3702 connection.

YES

Check P3702connection and power.

Pin1 : FL-22 Pin2 : FL+26Pin3 : VKK- over

26V.

Check if both end votageof F1, F2 are over 3.7V.

VKK : over 26V.


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6. PWM MODULATION PART CHECK

PWM modulationpart check

YES

YES

YES

YES

P7905_PIN93.3V checking

Check IC604(PS9829)

VDD PIN voltage(3, 7, 8,10, 22, 29, 39, 47, 56, 65,

72, 94).Check X601_PIN2 3.3V.


YES

YES

YES

YESCheck IC605_

PIN3 input and PIN2output.

CheckX601 12.288MHz

operation.

Check IC605_PIN8 3.3V.

Check IC605_PIN3 input

Check X6012.288MHz

NO

NO

Check FB614BEAD input, output and

voltage.

NO

Check X60112.288MHz.

Replace X601.

OK

NO

OK

YES

YES

NOReplace FB614

NO

Check IC605_PIN2 output

Replace IC605.NO

NOReplace X601.

OK


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Power AMP part check

YES

Check each LINE registor output voltage.IC700 : R701, 702, 726, 727

NO

Check each

IC700, 701, 702, 703PIN1,17, 18, 19, 36 +12V

input.

Refer to SMPS troubleshooting.

YES

YES

YES

NOP7905_3PIN : +12V,PIN13, 14, 15 : 35V.

Check PWM modulator input.

Each IC PIN4 6 14 16

Check each IC700, 701, 702, 703

PIN21, 26, 29, 34 input voltage.

7. POWER AMP PART CHECK


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8.AUX FUNCTION CHECK

AUX function check

Check -COM(IC301)_PIN83, 84 commucation.

NO NO

YES

Replace IC200

YES

YES

YES

CheckIC200(BU4052)_

PIN4, 11 inputwaveform.

CheckIC200(BU4052)_PIN16

VDD, PIN8 VSSpower.

YES

Check IC200(BU4052)_PIN3, 13 output waveform.

Check JK800 connection.


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9. TUNER FUNCTION CHECK

TUNER function check

YES

Check IC200(BU4052)_PIN16 VDD, PIN8 VSS power.

NO

CheckIC200(BU4052)_PIN3, 13

output waveform and IC601(BU4052)_PIN2,15 input

waveform.

Check TUNER module voltage(PIN2 : 9V).

YES

YES

YES

NOCheck TUNERmodule(TU601) operation.

YES Replace IC200.Replace IC200.

Check IC200(BU4052)_PIN1, 12 input

waveform.


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10. TAPE FUNCTION CHECK

TAPE function check

YES

Check IC200(BU4052)_

PIN16 VDD, PIN8 VSS power

YES

YES

NOCheckIC200(BU4052)_PIN2, 15 input

waveform.

YES

Replace IC200.Replace IC200.

Check IC200(BU4052)_PIN3, 13output waveform and IC601(BU4052)_

PIN2, 15 input waveform.

YES

TAPE PCB ASS`Y


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11. TAPE PLAY PART CHECK

TAPE PALY part check

Replace head wire and tapedeck mechanism.

NO NO

YES

YES

Check A deck head input

IC201_PIN32, 39 and B deckhead input IC201_PIN34, 37.

YES

YES

YES

Check IC201_PIN5, 26 signal

output.

CheckIC201(HA12237)_PIN16

12V input.

Check A/Bdeck head input.


Replace IC201.NO

YES

Check IC201


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12. TAPE REC PART CHECK

TAPE REC part check

YES

Check IC201_PIN7, 24 record input.

YES

YES

YES

CheckIC604(PS9829)_PIN49, 52

PWM output.

Replace IC201.NO NOCheck IC201_

PIN10, 21 output.Check IC100_PIN23

"HIGH"

NO Refer to PWMmodulation troubleshooting.

YES

OK


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INTERNAL BLOCK DIAGRAM OF ICs

1. ES6838

SDRAM/ROMInterface

GPIO

+

Gateway

DMAController

TV-EncoderVDAC

HDMI I/F

DisplayOSD / SPUController

ScalerDeIntelacer16 K Cache

32-BitRISC

Processor

Audio ADC

Serial AudioInterface

Audio DAC

USB


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2. HA12237F


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3. PS9829B

MBCK

SBCK

SLRCK

MLRCK

MSDIN[0:3]

SSDIN[0:3]

MIC_MCLK

DMIX_MCLK

OLRCK

OBCK

DMIX_SDOUT

PWM1_P/M

PWM2_P/M

PWM3_P/M

PWM4_P/M

PWM5_P/M

PWM6_P/M

PWM7_P/M

PWM8_P/M

PWM_HP_L_P/M

PWM_HP_R_P/M

PWM_SWL_P/M

EPD_ENA

OVERLOAD

MIC_BCK

MIC_LRCK

MIC_SDIN

SPI/I2C

SO/SDA

SCK/SCL

SI/I2C_AD0

/CS/I2C_AD2

EXT_MUTE

CLK_

IN

/RESET

PLL_

DVDD

PLL_

DVSS

PLL_

AVDD

PLL_

AVSS

DVDD

DVSS

IO_

VSS

IO_

VDD

Internal Controls

Internal Clock Internal Reset

Host

Interface

(I2C, SPI)

Mic,

Input

Processor

Input

Mapper

Sample

Rate

Converter

Input

&

Output

MUX

Serial Audio

Output

Interface

Down

Mixer

Mixer 4 Band

EQ

Bass

Manager

Main

Volume

Trim

Volume

Serial

Audio

Output

Interface

PWM

Modulator

POP

NRPower Supply

OutputMappe

r

PLL

Reset & Power Down

Automatic

Gain

Limiter

4. PT6324


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5. STR-S6757IF1905

4Vcc

StartStopBurst

Protection

latch

DRIVE

Reg

Delay

Burst

Control

GND

S

D

FB

FB

Q

Q

S

S

R

R Q

S

Reg&Iconst

6

3

2

1

OVP


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6. TAS5142

2nd-Order L-C

Output Filter

for Each

Half-Bridge

2-Channel

H-Bridge

BTL Mode

System

Microcontroller

OUT_A

OUT_B

OUT_C

OUT D

BST_A

BST_BRESET_AB

RESET_CD

PWM_A

PWM_C

PWM_B

VALID

Left-

Channel

Output

Right-

Channel

Input

HBridge 1

Input

Bootstrap

Capacitors

2nd-Order L-C

Output Filter

for Each

SD

OTW

Output

H-Bridge 2

Output

H-Bridge 1

OTW

SD

TAS5508


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7. U1739EJ2V1UD00/KF2_E

Port 0 P00 to P067

Port 1 P10 to P178

Port 2 P20 to P277

Port 3 P30 to P334

Port 4 P40 to P478

Port 5 P50 to P578

Port 6 P60 to P678

Port 7 P70 to P778

Port 12 P120 to P1245

Port 13 P130

Port 14 P140 to P1456

Buzzer output BUZ/P141

16-bit timer/

event counter 00

TO00/TI010/P01

TO01/TI011/P06

TI000/P00

TI001/P05

TOH0/P15

TOH1/P16

TI50/TO50/P17

TI51/TO51/P33

R D0/P11

RxD6/P14 (LINSEL)

16-bit timer/

event counter 01

8-bit timer H0

8-bit timer H1

Watchdog timer

78K/0

CPU

coreFlash

memory

BANKNote 1

Watch timer

8-bit timer

event counter 50

8-bit timer

event counter 51

Internal low-speed

oscillator


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MEMO

WIRING DIAGRAM


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3-22

23P

VIDEO

JACK

5P

5P

5P3P

DVD PCB

2.1 CH SPK TERMINAL AUX

JACK

TUN

ER

MOD

ULE3 CHANGER MD

MAIN

PCB

DECK PCB

DOUBLE DECKMECHANISM

15P

12P

8P

8P

8P3P 15P

29P

USB MIC H/P FRONT PCB

SMPS PCB

15P

8P

4P

[Total CNT Q'ty : 16ea]

1. SMPS MAIN : 2ea

2. MAIN DVD : 2ea

3. MAIN DECK : 2ea

4. MAIN FRONT : 1ea5. FRONT DVD : 1ea

6. DVD MD : 5ea

7. DECK MECHA. : 3ea

3-23

BLOCK DIAGRAMS


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AC INPUT

ZNR &

FILTER

T

R

A

N

S

MAIN&AMP

PWM IC

12V (78R12)

5V(P-SENS)

5.6VA (KIA278R05)

CN2

CN1

AMP (+) 3 1.5V

3.5V (278R35)

RECTIFICATIONSMOOTHING

CIRCUIT

BETWEEN FL1 AND FL2(4.5V)

-12V

FEED BACK

-31. 5V(VKK)

3-24 3-25

1. SMPS BLOCK DIAGRAM


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USB

FL +/-

FR +/-

TAS5152or

TAS5142

Digital

Power

AMP

FL

FR

PS9830

PWM

Modulator

78F0546

AUDIO

MICOM

9830_R

9.8304MHz12.288MHz

STCLK/DATA

5142_RST

5142_SD

DEC

KA

DECKB

HA12237F

Cassette

Deck

ASP

L/R, REC_L/RERASE

L/R

TR DRIVER

DECKS/W

REC_MUTE, PB_MUTE, TAPE_A/B

SOL_A/B, MOTOR, REC_BIAS

HALL_A/B, LEAF_A/B

TUNE

RMODULE

BU4052

AUDIO

S/W

RDS_CLK / DATA, PLL_DO / CLK / CE

PLL_DI, T_MUTE

REC_L / R

DECK_L/R

AUX

4052_A / B

H/P

MIC

TUNER_L / R

AUX_L / R

BA3308

OPAMP (ALC)

H/P_L / R

FLT

DISPLAY

PT6324

FLT

DRIVER

KS24C021

EEPROM

EEPROM

CLK/DATA

VFD_STB / DI / DO / CLK

AK5358

2CH. ADC ES8380

MPEG

DVDRX/TX,RST

AUDIO L / R DA_LRCK / BCK / ADATA0 / 1 / 2 / 3

AD_ADATA

MCLK

ADC_RST

MIC_SIG

USB D+ / D-

KS24C021

EEPROM

EEPROM

CLK/DATA

SDRAM FLASH

DMA[0:1

0]

DB[0:15]

LD[0:7

]

LA[0:21]

IP9011

MOTOR

DRIVER

RGB CVBS S

VIDEO

Y/G, PR/R, PB/B, CVBS, Y, C

PICK UPPICK UP

MOTORMOTOR

MDMDSENSOR, OP/CL/UP/DN SW, LIMIT

SPINDLE, SLED

LOAD, TURRET

TR +/-, F +/-

A, B, C, D, E, F, RF

SVREF,

DRV_MUTE

TRO, FO, SLD,

SPO, TUR, OP/CL

I-POD

[4]

[4]

[4][3]

[3]

[6]

[3]

[5] [2]

3-26 3-27

2. MAIN & FRONT BLOCK DIAGRAM

SCHEMATIC DIAGRAMSWHEN SERVICING THIS CHASSIS, UNDER NOCIRCUMSTANCES SHOULD THE ORIGINALDESIGN

SCHEMATIC FOR EASY IDENTIFICATION. THISCIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER

1. Shaded( ) parts are critical for safety. Replace onlyith ifi d t b

IMPORTANT SAFETY NOTE :


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3-28 3-29

1. SMPS SCHEMATIC DIAGRAMCIRCUMSTANCES SHOULD THE ORIGINALDESIGNBE MODIFIED OR ALTERED WITHOUT PERMISSIONFROM THE LG CORPORATION. ALL COMPONENTSSHOULD BE REPLACED ONLY WITH TYPESIDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.SPECIAL COMPONENTS ARE SHADED ON THE

CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFERFROM THE ACTUAL CIRCUIT USED. THIS WAY,IMPLEMENTATION OF THE LATEST SAFETY ANDPERFORMANCE IMPROVEMENT CHANGES INTOTHE SETIS NOT DELAYED UNTILTHE NEW SERVICELITERATURE IS PRINTED.

with specified part number.2. Voltages are DC-measured with a digital voltmeter

during Play mode.


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3-30 3-31

2. MAIN SCHEMATIC DIAGRAM


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3-32 3-33

3. AMP SCHEMATIC DIAGRAM


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3-34 3-35

4. DECK SCHEMATIC DIAGRAM

O SC C G


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3-36 3-37

5. FRONT SCHEMATIC DIAGRAM

1 MAIN P C BOARD

PRINTED CIRCUIT DIAGRAMS


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3-38 3-39

1. MAIN P.C.BOARD(TOP VIEW)

MAIN P C BOARD


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3-40 3-41

MAIN P.C.BOARD(BOTTOM VIEW)

2 SMPS P C BOARD


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3-42 3-43

2. SMPS P.C.BOARD

3 FRONT P C BOARD


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3-44 3-45

3. FRONT P.C.BOARD


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DVD ELECTRICAL TROUBLESHOOTING GUIDE

SECTION 4 DVD PART ELECTRICAL

1. POWER CHECK GUIDE

Power ON

YES

YES

YES

YES

Does DVD/CD

appear at FLD?

DoesDISK1 appear

at FLD?

Does itappear DVD ERROR

at FLD?

Func

Power ON

DoesAUX, FM 87.5.AM,

USB appear atFLD?

YES

Check connector(P400, P4004, P401).

Does No DISC orTime are appeared

at FLD?

NO

NO NO

NO

NO

OK

Reconnect it.


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2. TEST & DEBUG FLOW

Check AV cableconnection to TV set.

Power ON

Check connection linesbetween FLASH & ES8380 or

the FLASH access time whetheris suitable or not.

NO NO

YES

Show LOGO?Flash

memory operatesproperly?

Check connection linesbetween SDRAM (IC502) &ES8380 or the SDRAM is

damaged.

NO

YES

SDRAM worksproperly?

Check the relatedcircuit of ES6698FD (IC501)PIN133,134,137,138,139,140

NO

YES

ES8380VIDEO outputs

properly?

YES


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Do not put in discand tray close.

Check the MD

Doesthe SLED

move to inner sidewhen it is at outer

position?

Moter driver DRV-MMUTE PIN is

high 3

NONO

YES

YESYES

Check the related

circuit of SLED and

motor driver IC (IC401)

SLEDsignal is OK?

NO

B

Check the cable

connection with MECHA.

YES


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Put disc in tray. Laser off

Check the laser power circuitbetween ES8381 and power

transistor. (Q405, Q406)

Laserturns on whenreading disc?

DVDLDor CDLD output

properly?

NONO

NO

YES

Check the related circuit oflaser power transistor.

Collectorvoltage of powertransistor is OK?

(Q405, Q406)

NO

YES

YES

YES

C

Check cable connection

between P400 andpick-up head.


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Check the connections betweenPDM01 and pick-up head.

Check the related circuit ofES8380 focus signal.

Focus on OK?

Propersignal on A, B, C, D

from MD?

NO

ProperFOO signal on

IC401?

NO

NO

YES

YES

YES

D

Check cable connectionbetween P400 and MD.

Check the related circuitbetween IC401 and ES8380Tracking OK?

ProperTRO signal on

IC401?

NONO

YES


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Check the connections betweenES8380 and P4703

Alloutputs are OKduring playing

DISK?

Audiosignal data onP8380 is OK?

NONO

YES

YES

E

Check the MAIN PCB

For example composite video,check the video mute TR

(Q411), output of video bufferIC (IC407) and ES8380

video signal data

TEST END

Picture

signal data onES8380 is OK?

NONO


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3. USB PART

TURN ON USB

NO

Check the POWER supply circuit.

(Check P5701)

NO

Check the HRST# signal

Check the USB PART andDVD PART line.

NO

Check the USB DATA LINE. (P5301)

Checking orUSB display check

NO

YES

Check the USB JACK POWER supply.

(Check P5301)Reading OK check

NO


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WAVEFORMS

1. WHEN POWER ON, RESET & DATA ETC WAVEFORM

1. RESET(DVD)2. RX3. TX4. LCS3# (FLASH)


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2. OPEN / CLOSE WAVEFORM AT POWER ON

1. open2. UP-sw3. DOWN-sw4. close

3 STARTING ACTION WAVEFORM IN MD DEVICE


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4. FOCUS WAVEFORM (AT CD)

1. F+2. F-(NO DISK)

5 FOCUS WAVEFORM (AT DVD)


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6. AT POWER ON, SPINDLE SIGNAL AT MD DECK

1. Spind2. Spin+3. Spin-

7 AT FIRST ACTION FOCUS SIGNAL A B C D


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8. TRACKING SIGNAL

1. Tro2. Tr-3. Tr+

9 RF WAVEFORM


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10. DISK TYPE JUGEMENT WAVEFORM

1. F+2. FDO3. SVRRF

(DVD)

MEMO


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MEMO

SCHEMATIC DIAGRAMS

1. MPEG SCHEMATIC DIAGRAM


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4-15 4-16

2. SERVO SCHEMATIC DIAGRAM


65/69

4-17 4-18

3. INTERFACE SCHEMATIC DIAGRAM


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4-19 4-20

DVD P.C.BOARD(TOP VIEW)

PRINTED CIRCUIT DIAGRAM


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4-21 4-22

DVD P.C.BOARD(BOTTOM VIEW)


68/69

4-23 4-24

MEMO MEMO


69/69

4-25 4-26

Documents

LG MDD62 service manual