LG LAD4700R Service manual

CAR DVD RECEIVER

SERVICE MANUAL

MODEL : LAD4700R

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL

.

MODEL : LAD4700R

SERVICE MANUAL

Control panel

P/NO : AFN33777084 JUNE, 2007

Website http://biz.lgservice.com

Internal Use Only

CONTENTS

SECTION 1 SUMMARY

SERVICING PRECAUTIONS .........................................................................................................................1-2

ESD PRECAUTIONS ......................................................................................................................................1-3

SPECIFICATIONS ...........................................................................................................................................1-4

SECTION 2 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS.................................................................2-1

1. SYSTEM CONTROL ERROR CORRECTION FLOW CHART...............................................................2-1

2. SOUND ERROR CORRECTION FLOW CHART ...................................................................................2-4

3. DISPLAY ERROR CORRECTION FLOW CHART .................................................................................2-9

4. TUNER ERROR CORRECTION FLOW CHART..................................................................................2-12

5. AUX ERROR CORRECTION FLOW CHART .......................................................................................2-14

6. DVD ERROR CORRECTION FLOW CHART.......................................................................................2-15

• WAVEFORMS .........................................................................................................................................2-19

INTERNAL BLOCK DIAGRAM OF ICs ......................................................................................................2-31

1. IC301 (HA13173AH) .............................................................................................................................2-31

2. IC401 (uPD78F1164) ............................................................................................................................2-33

3. IC403 (NJM2279M) ...............................................................................................................................2-37

4. IC601 (TDA7419) ..................................................................................................................................2-38

5. IC801 (TB2904HQ) ...............................................................................................................................2-40

6. IC901 (PT6523).....................................................................................................................................2-40

7. IC1502 (ES29LV320E) ..........................................................................................................................2-41

BLOCK DIAGRAMS......................................................................................................................................2-43

1. OVERALL BLOCK DIAGRAM...............................................................................................................2-43

2. DVD BLOCK DIAGRAM........................................................................................................................2-45

CIRCUIT DIAGRAMS....................................................................................................................................2-47

1. MAIN-1 CIRCUIT DIAGRAM.................................................................................................................2-47

2. MAIN-2 CIRCUIT DIAGRAM.................................................................................................................2-49

3. FRONT CIRCUIT DIAGRAM.................................................................................................................2-51

4. DVD-1 CIRCUIT DIAGRAM ..................................................................................................................2-55

5. DVD-2 CIRCUIT DIAGRAM ..................................................................................................................2-57

6. DVD-3 CIRCUIT DIAGRAM ..................................................................................................................2-59

7. AUX CIRCUIT DIAGRAM......................................................................................................................2-61

8. LCD LIGHTING CIRCUIT DIAGRAM....................................................................................................2-62

PRINTED CIRCUIT BOARD DIAGRAMS...................................................................................................2-63

1. MAIN P.C.BOARD .................................................................................................................................2-63

2. FRONT P.C.BOARD..............................................................................................................................2-65

3. DVD P.C.BOARD ..................................................................................................................................2-67

4. AUX P.C.BOARD...................................................................................................................................2-69

5. LCD LIGHTING P.C.BOARD.................................................................................................................2-69

SECTION 3 EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION................................................................................................3-1

2. MECHANISM(PICK-UP) SECTION ........................................................................................................3-3

SECTION 4 REPLACEMENT PARTS LIST.................................................4-1

1-1

LGE Internal Use Only

SECTION 1 SUMMARY

SERVICING PRECAUTIONS

1. Always disconnect the power source before:

1) Removing or reinstalling any component, circuit board, module or any other instrument assembly.

2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection.

3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an

explosion hazard.

2. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped.

3. Do not apply power to this instrument and or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

4. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.

1) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing,

follow the printed or indicated service precautions and service materials.

2) The Components used in the unit have a specified conflammability and dielectric strength. When replacing

any components, use components which have the same ratings. Components marked in the circuit diagram are important for safety or for the characteristics of the unit. Always replace with the exact components.

3) An insulation tube or tape is sometimes used and some components are raised above the printed writing

board for safety. The internal wiring is sometimes clamped to prevent contact with heating components. Install them as they were.

4) After servicing always check that the removed screws, components and wiring have been installed correctly

and that the portion around the service part has not been damaged. Further check the insulation between the blades of attachment plug and accessible conductive parts.

LGE Internal Use Only

1-2

Only for training and service purposes

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 are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques 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, drain

off any electrostatic charge on your body by touching a know earth ground. Alternatively, obtain and wear 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 conductive

surface 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, touch

the 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

OTHER SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless

motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED "DANGEROUS VOLTAGE" THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

1-3

LGE Internal Use Only

SPECIFICATIONS

• GENERAL

Output Power 50W x 4CH (Max.) Power Source DC 12V Speaker impedance 4Ω Ground System Negative Dimensions (W x H x D) 182 x 51 x 171mm (Without Front Panel) Net Weight 1.5kg

• CD/DVD/VCD SECTION

Frequency Response 20Hz ~ 20kHz S/N Ratio 85dB Distortion 0.05% Channel Separation (1kHz) 70dB

• RADIO SECTION

FM

Frequency Range 65 ~ 74, 87.5 ~ 108MHz S/N Ratio 55dB Distortion 0.7% Usable Sensitivity 12dBµV

MW (AM)

Frequency Range 520 ~ 1720 or 522 ~ 1620kHz S/N Ratio 45dB Distortion 1.0% Usable Sensitivity 28dBµV

• AUX SECTION

Frequency Response 20Hz ~ 20kHz S/N Ratio 85dB Distortion 0.05% Channel Separation (1kHz) 45dB Max Input Level (1kHz) 1.2V (35KΩ)

LGE Internal Use Only

1-4

Only for training and service purposes

SECTION 2 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

1. SYSTEM CONTROL ERROR CORRECTION FLOW CHART

Something wrong with

the system control?

No power?

YES

Checked the fuse?

YES

Checked the back up

Vdd and Gnd, Acc?

YES

Checked the main

Micom Back up, Vdd?

YES

Checked the main

Micom back up Gnd?

YES

Checked the main

Micom reset?

YES

NO

1-A

IC401(100, 99, 81, 30, 50, 47, 97, 20, 51)

1-F

~

Inside of CN801, F801(10A)

CN801(16, 15, 14)

IC301(15, 14)

IC402, IC401(90)

Checked the main

Micom X-tal?

YES

Checked the ACC in?

YES

Checked the

detachable switch?

YES

Checked the front

panel VDD?

YES

Checked the front

panel switch input?

YES

OK

NO

2-1

X401, X402

F301, Q301, Q302, IC401(38), CN801(14)

CN901(19), IC401(74)

CN901(14), IC401(21), Q316, Q317

IC401(52, 53)

LGE Internal Use Only

1-A

Not available to remocon?

YES

Checked the remocon

sens Vdd?

YES

Checked the remocon

sens line?

YES

OK

1-B

Not available to volume control?

YES

Checked the encoder volume?

NO

RMC1, R906

CN901(5), IC401(5)

EV901, CN901(6, 7), IC401(40, 41)

YES

Checked the volume

IC control?

YES

OK

1-C

Not available to key control?

YES

Checked the tact switch?

YES

Checked the key line?

YES

OK

NO

IC401(1, 2), IC601(22, 23)

SW901 ~ SW918, EV901

CN901(8, 9), IC401(52, 53)

LGE Internal Use Only

2-2

Only for training and service purposes

1-D

Not available to telephone mute?

YES

Checked the tel mute input?

YES

Checked the mute control?

YES

OK

1-E

Not available to ANT(Motor Type) control?

NO

CN801(5), Q305,Q306, IC401(62)

IC401(1, 2, 3, 6, 61), IC601(21, 22,23),

IC801(22), Q707, Q708, Q709, Q710

YES

Checked the ANT

control?

YES

OK

1-F

Not available to remote(Power AMP) control?

YES

Checked the

remote control?

YES

OK

NO

CN801(10), IC302(4), IC401(63)

CN801(6), IC301(12), IC401(87)

2-3

LGE Internal Use Only

2. SOUND ERROR CORRECTION FLOW CHART

Something wrong with the sound?

No sounds of all functions?

YES

Checked the E-VR Vdd?

YES

Checked the E-VR Ground?

YES

Checked the E-VR control?

YES

Checked the E-VR

mute control?

YES

Checked the E-VR

signal in/out?

YES

NO

2-A

IC601(5, 6, 7, 8, 11, 13, 16, 17, 18, 19, 20)

2-F

~

IC601(24)

IC601(15)

IC601(22, 23), IC401(1, 2)

IC601(21), IC401(6)

Checked the power

Checked the main

LGE Internal Use Only

Checked the

power IC Vdd?

YES

IC Ground?

YES

IC Control?

YES

IC signal in/out?

YES

connector?

YES

OK

NO

2-4

IC801(6, 20)

IC801(1, 2, 8, 13, 18, 24)

IC801(4, 22), IC401(3, 10)

IC801(3, 5, 7, 9, 11, 12, 14, 15, 17, 19, 21, 23)

CN801(1, 2, 3, 4, 8, 9, 12, 13)

Only for training and service purposes

2-A

No REAR line out signal?

YES

Checked the line

out AMP Vdd?

YES

Checked the line out

AMP Vdd control?

YES

Checked the line

out AMP Ground?

YES

Checked the line out

AMP mute contorl?

YES

Checked the line out

AMP signal in/out?

YES

OK

NO

Q308, F303, IC701(8)

Q309, IC401(64)

IC701(4)

IC401(48), Q705, Q701, Q703

IC701(1, 2, 3, 5, 6, 7)

2-B

Hearing the Pop noise with TUNER function?

(RDS Model)

YES

Checked the

mute control?

YES

Checked the AF mute?

YES

OK

NO

2-5

IC401(1, 2, 3, 6, 61), IC601(21, 22,23),

IC801(22), Q707, Q708, Q709, Q710

TU101(19), IC401(4)

LGE Internal Use Only

2-C

No subwoofer line out signal?

YES

Checked the line

out AMP Vdd?

YES

Checked the line out

AMP Vdd control?

YES

Checked the line

out AMP Ground?

YES

Checked the line out

AMP mute contorl?

YES

Checked the line out

AMP signal in/out?

YES

OK

NO

Q308, F303, IC702(8)

Q309, IC401(64)

IC702(4)

IC401(48), Q705, Q701, Q703

IC702(1, 2, 3, 5, 6, 7)

No output Beep sound?

LGE Internal Use Only

2-D

YES

Checked the

Beep control?

YES

OK

NO

2-6

IC401(80), BU302

Only for training and service purposes

2-E

No RSE line out signal?

YES

Checked the line

out AMP Vdd?

YES

Checked the line out

AMP Vdd control?

YES

Checked the line

out AMP Ground?

YES

Checked the line out

AMP mute contorl?

YES

Checked the line out

AMP signal in/out?

YES

OK

NO

Q308, F303, IC201(8)

Q309, IC401(64)

IC201(4)

IC401(11), Q201, Q202, Q203

IC201(1, 2, 3, 5, 6, 7)

2-F

Hearing the Pop noise with RSE function?

YES

Checked the

mute control?

YES

OK

NO

2-7

IC401(11), Q201, Q202, Q203

LGE Internal Use Only

CAUTION - Tip for repair

A

Before exchange power amp IC(TB2904) for no audio problem, you have to check

below list.

1. Check VCC (pin 20, 6) & GND

2. Check input pin 11, 12, 14, 15

3. Check Standby, pin 4

: Follow the below list.

4. Check Mute function, pin 22

: Follow the below list.

Stand-by Power Sound Voltage

ON OFF OFF 0 to 1.5

OFF ON ON 3.5 to 6V

5. Check Ripple pin 10.

: Normally it is high (about 10V)

Mute Sound Voltage

ON OFF 0 to 1.5

OFF ON 3.5 to 6V

6. Re-soldering all the pin of IC.

: Prevent crack of solder line.

* Keep changed IC, We request that you send it to HQ.

C1

C6

C1

PRE-GND

1 20 6

TAB V

IN1

11

IN2

12

C-GND

16

IN3

15

IN4

14

13

STBYRIP

10 25 22

2

C

4

CC1VCC2

OFF-SET

DET

OUT1

()

PW-GND1

OUT1 ( )

OUT2 ( )

PW-GND2

OUT2 ( )

OUT3 ( )

PW-GND3

OUT3 ( )

OUT4 ( )

PW-GND4

OUT4 ( )

MUTE

4

C

3

5

C

+

9

8

7

+

5

2

3

+

17

18

-

19

+

21

24

-

23

R

1

R

L

R

L

R

L

R

L

5 V

PLAY

MUTE

: PRE-GND

: PW-GND

Picture 1) Power IC desc.

LGE Internal Use Only

2-8

Only for training and service purposes

3. DISPLAY ERROR CORRECTION FLOW CHART

Something wrong with the display?

No display or some display is broken?

YES

Checked the LCD

driver Vdd?

YES

Checked the LCD

driver Ground?

YES

Checked the LCD

driver reset?

YES

Checked the LCD

driver OSC?

YES

Checked the LCD

driver data interface?

NO

3-A

3-C

~

IC901(56)

IC901(60)

IC901(57), CN901(11), IC401(75)

IC901(61)

IC401(76, 78, 79), CN901(3, 4, 10),

IC901(62, 63, 64)

YES

Checked the LCD

to LCD driver line?

YES

OK

NO

2-9

IC901(1 ~ 55), LCD

LGE Internal Use Only

3-A

Not available to illumination with button?

YES

Checked the dimmer

control input?

YES

Checked the LED Vdd?

YES

Checked the LED?

YES

OK

3-B

Don't moved level dancing bar?

YES

NO

F302, CN801(11), IC401(66), IC301(9)

IC301(4), CN901(13)

LD901 ~ LD923

Checked the level

meter signal Input?

LGE Internal Use Only

OK

YES

NO

2-10

IC601(25, 26), IC401(9, 54)

Only for training and service purposes

3-C

Not avaliable to LCD lighting control?

YES

Checked the

dimmer control input?

YES

Checked the LCD Vdd?

YES

Checked the LCD

Vdd control?

YES

Checked the LED?

YES

OK

NO

F302, CN801(11), IC401(66), IC301(9)

IC301(4), Q320, Q322, CN901(12)

IC401(58, 59), Q319, Q321

LD930 ~ LD931

2-11

LGE Internal Use Only

4. TUNER ERROR CORRECTION FLOW CHART

Something wrong with

the Tuner system?

Not available to Tuner?

YES

Checked the

Tuner Vdd?

YES

Checked the Tuner

Vdd control?

YES

Checked the Tuner

Ground?

YES

Checked the PLL data?

YES

Checked the RF

signal in?

NO

4-A

TU101(11, 12, 13, 14, 15), IC401(44, 45, 46,)

4-C

~

TU101(4, 16), Q307, IC301(10, 14)

IC401(39, 64), Q318, IC301(11)

TU101(3, 10, 17)

TU101(1, 2)

Checked the mute

control? (RDS Model)

LGE Internal Use Only

YES

Checked the

SD level?

YES

OK

NO

2-12

TU101(19), IC401(4)

TU101(6), IC401(69)

Only for training and service purposes

4-A

Tuner no sound?

YES

Checked the Tuner

signal out?

YES

Checked the mute?

(RDS model)

YES

Checked the EVR

& power AMP?

YES

OK

4-B

NO

TU101(8, 9), IC601(5, 6)

TU101(19), IC401(4)

See the sound error correction process.

Not available to RDS function?

YES

Checked the

RDS data?

YES

OK

4-C

only RDS model

Not available to AF?

YES

Checked the

SMETER level?

YES

Checked the

RDS data?

YES

NO

TU101(20, 21), IC401(65, 83)

TU101(7), IC401(55)

TU101(20, 21), IC401(65, 83)

OK

2-13

LGE Internal Use Only

5. AUX ERROR CORRECTION FLOW CHART

Something wrong with

the Tuner system?

AUX no sound?

YES

Checked the AUX

signal input?

YES

Checked the EVR

& power AMP?

YES

OK

NO

JK901, CN503,

CN901(15,17), IC601(11, 13)

See the sound error correction process.

LGE Internal Use Only

2-14

Only for training and service purposes