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P/NO : AFN74552044 SEPTEMBER, 2010

CAR DVD RECEIVER

SERVICE MANUAL

MODEL: LDF900UR

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS

IN THIS MANUAL.

Website http://biz.lgservice.com

Internal Use Only

MODEL:LDF900UR

SERVICE

MANUAL

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CONTENTS

SECTION 1 SUMMARYSERVICING PRECAUTIONS ............................................................................................................................ 1-2

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

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

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

FIRMWARE UPGRADE METHOD .................................................................................................................... 1-6

SECTION 2 ELECTRICALELECTRICAL TROUBLESHOOTING GUIDE................................................................................................... 2-1

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

2. SOUND ERROR CORRECTION FLOW CHART. .................................................................................... 2-6

3. DISPLAY ERROR CORRECTION FLOW CHART ................................................................................. 2-10

4. TUNER ERROR CORRECTION FLOW CHART.................................................................................... 2-16

5. AUX ERROR CORRECTION FLOW CHART......................................................................................... 2-19

6. DVD ERROR CORRECTION FLOW CHART ........................................................................................ 2-21

7. USB ERROR CORRECTION FLOW CHART......................................................................................... 2-24WAVEFORMS .................................................................................................................................................. 2-25

WIRING DIAGRAM .......................................................................................................................................... 2-27

BLOCK DIAGRAMS ........................................................................................................................................ 2-29

1. OVERALL BLOCK DIAGRAM................................................................................................................. 2-29

2. POWER BLOCK DIAGRAM.................................................................................................................... 2-31

MAIN PART .......................................................................................................................................... 2-31

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SECTION 1 SUMMARY

SERVICING PRECAUTIONS1. 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 de-

vice heat sinks are correctly installed.

4. Always connect a test instruments 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

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ESD PRECAUTIONS

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

mercially 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 surfacesuch 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 de-

vices.

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.

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SPECIFICATIONS

GENERAL

Output Power 53 W x 4 CH (Max.) Power Source DC 12 V

Speaker impedance 4

Ground System Negative

Dimensions (W x H x D) 178 x 50 x 169 mm (Without Control Panel)

Net Weight (Approx.) 1.42 kg

TUNER

FM Tuning Range 87.5 to 107.9 or 87.5 to 108 MHz

AM Tuning Range 520 to 1720 or 522 to 1620 kHz

CD

Frequency Response 20 Hz to 20 kHz

S/N Ratio 85 dB

Distortion 0.1 %

Channel Separation (1 kHz) 55 dB

AUX

Frequency Response 20 Hz to 20 kHz

S/N Ratio 85 dB

Distortion 0.1 %

Channel Separation (1 kHz) 55 dB

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LOCATION OF USERS CONTROLS

FRONT PANEL

A B C D E G H I

K L M NJ

F

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FIRMWARE UPGRADE METHOD

InsertFirmware upgrade CD

1. Enter 2. Reading Progress 3. Erase Progress

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SECTION 2 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

1. SYSTEM CONTROL ERROR CORRECTION FLOW CHART

No power?

Something wrong with the system control?

YES

Fuse Inside of CN801NO

CN801(3, 4)NO

IC301(15, 14)NO

IC401(30, 47, 50, 99, 100)NO

1A 1B 1C 1D 1E 1F 1G 1H 1I

Checked the fuse?

Checked the back upVDD and GND?

Checked the regulatorback up and VDD?

Checked the mainmicom back up VDD?

YES

YES

YES

YES

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Not available to telephone mute?

OK

YES

CN801(10), Q311, Q305, IC402(62)NO

Checked thetel mute input?

YES

1D

Not available to ANT(motor type) control?

OK

YES

CN801(9), IC302(1, 4), IC401(63)NO

Checked theANT control?

YES

1E

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Not available to remote(power AMP) control?

OK

YES

CN801(8)NO

Checked theremote connector?

YES

1G

IC301(13), IC401(87)Checked theremote control to MCU?

YES

NO

Not available to park(hand brake)?

YES

NO

1H

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Not available to reverse control?

YES

CN905(2)NO

Checked the connectorcontrol signal?

Q705NOChecked the

control TR?

IC401(69)NO

Checked theMCU control?

NOChecked the

IC404(7), IC401(81)NOChecked the

detect signal?

1I

YES

YES

YES

YES

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2. SOUND ERROR CORRECTION FLOW CHART

Something wrong with the sound?

2A 2B 2C 2D

No sounds of all functions?

YES

IC601(24)NOChecked the

E-VR VDD?


E-VR GND?

IC601(25, 26 ), IC401(45, 46)NO

Checked theE-VR control?

IC601(15), IC401(6),

Q707, Q708, Q709, Q710, Q711

NOChecked the E-VR

mute control?

IC401(61), Q701, Q702, Q703, Q704, Q705NO

Checked the line outmute control?

YES

YES

YES

YES

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No front line out signal?

OK

YES

IC601(24), IC301(8)NO

Checked the E-VR VDD?

YES

IC601(27)NO

Checked the E-VR GND?

YES

IC601(1, 2, 5, 6, 7, 9, 12, 13, 22, 23)NO

Checked the E-VR signal in/out?

YES

2A

IC601(15), IC401(6)NO

Checked the E-VR mute control?

YES

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No rear(subwoofer) line out signal?

OK

YES

IC601(24)NO


YES

IC601(27)NO


YES

IC601(1, 2, 5, 6, 7, 9, 18, 19)NOChecked the E-VR

signal in/out?

YES

2C

IC601(15), IC401(6)NO

Checked the E-VRmute control?

YES

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CAUTION - Tip for repair

Before exchange power amp IC(TB2946) 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.

5. Check Ripple pin 10.

: Normally it is high (about 10 V)

6 Re soldering all the pin of IC

Stand-by Power Sound Voltage

ON OFF OFF 0 to 1.5

OFF ON ON 3.5 to 6 V

Mute Sound Voltage

ON OFF 0 to 1.5

OFF ON 3.5 to 6 V

RL

RL

RL

11

9

8

7

5

2

3

17

18

19

21

24

23

12

15

14

1 20 6

RL

IN1

IN2

IN3

IN4

13

C1

C1

C1

C1

PRE-GND

10 25 22

OUT1 +

+

+

+

-

-

-

-

( )

PW-GND1

OUT1 ( )

OUT2 ( )

PW-GND2

OUT2 ( )

OUT3 ( )

PW-GND3

OUT3 ( )

OUT4 ( )

PW-GND4

OUT4 ( )

TAB VCC1 VCC2

C3

STBYRIP MUTE

C5

16C6

4

OFF-SET

DET 5 V

AC-GND

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3. DISPLAY ERROR CORRECTION FLOW CHART

No display or some display is broken?

Something wrong with the display?

3A 3B

YES

IC901(12, 23, 40, 58)NO

Checked the LCDdriver VDD?

YES

IC901(3, 4, 6, 7, 9, 13, 24,

35, 41, 57, 59, 67, 80)

NOChecked the LCD

driver GND?

YES

IC901(20)NO

Checked the LCDdriver reset?

YES

IC901(54, 55)NO

Checked the LCDdriver OSC?

3C 3D 3E 3F

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Not available to illumination with button?

OK

CN801(7), IC401(66), IC301(4)NO

Checked the dimmercontrol input?

CN901(17), Q322, Q321, IC402(19)NO

Checked the

LED VDD?

LD921 ~ LD937NO

Checked the LED?

3A

YES

YES

YES

YES

3B

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Not available to rear_video display?

CN905(2)NO

Checked the connectorcontrol signal?

Q705NO

Checked thecontrol TR?

IC401(69)NO

Checked theMCU control?

IC404(7), IC401(81)NO

Checked thedetect signal?

3C

YES

YES

YES

YES

YES

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Not available to front_video display?

JK901(5)NO

Checked the AUX input?

CN905(5), CN907(4)NO

Checked theinput connector?

CN901(4)NO

Checked the front board tomain board connector?

IC401(81), IC404(1)NO

Checked theMCU detect signal?

3D

YES

YES

YES

YES

YES

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Not available to DVD_video display?

IC1301(69)NO

Checked the DVD IC video output?

CN1602(24)NO

Checked the DVD boardvideo output connector?

CN903(7)NOChecked the main

board video input?

IC403(3)NO

Checked theswitch input?

3E

YES

YES

YES

YES

YES

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Not available to rear_out_video?

OK

IC403(2, 13)NO

Checked theswitch control?

3F

IC403(5)NO

Checked theswitch output?

JK705(9)NO

Checked therear out connector?

YES

YES

YES

YES

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4. TUNER ERROR CORRECTION FLOW CHART

Not available to tuner?

Something wrong with the tuner system?

YES

TU101(6, 17)NO

Checked the tuner VDD?

YES

IC301(11)NO

Checked the tunerVDD control?

YES

TU101(14, 15), IC401(1, 2)NO

Checked the I2C data?

YES

4A 4B 4C

TU101(3)NO

Checked the tuner GND?

YES

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Tuner no sound?

YES

TU101(10, 11)NO

Checked the tuner signal out?

TU101(8), IC401(4)NO

Checked the mute?

See the sound error correction process.NOChecked the

E-VR & power AMP?

IC601(25, 26 ), IC401(45, 46)NO

Checked the E-VRcontrol?

IC401(61), Q701, Q702, Q703, Q704, Q705NO

Checked the line outmute control?

IC601(15), IC401(6),

Q707, Q708, Q709, Q710, Q711

NOChecked the E-VR

mute control?

YES

YES

YES

YES

YES

4A

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Not available to AF?

YES

NO

4C

Not available to RDS function?

OK

YES

TU101(18, 19, 20)NO

Checked the RDS data?

YES

RDS(D405 ~ D409),Non RDS(D402, D404 ~ D409)

NO

Checked control diode?

YES

4B

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5. AUX ERROR CORRECTION FLOW CHART

AUX no sound?

Something wrong with the AUX system?

YES

CN907(1, 3), JK901NO

Checked the AUXsignal input?

YES

See the sound error correction processNO

Checked the E-VR & power AMP?

YES

IC601(24)NO


YES

IC601(27)NO


5A

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AUX no video?

JK901(5)NO

Checked the AUX input?

CN905(5), CN907(4)NO

Checked theinput connector?

CN901(4)NO

Checked the front boardto main board connector?

IC401(81), IC404(1)NO

Checked theMCU detect signal?

NO

5A

YES

YES

YES

YES

YES

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6. DVD ERROR CORRECTION FLOW CHART

No loading?

Something wrong with the DVD player?

6A 6B

YES

CN1602(15, 16, 18, 19, 20, 21)NO

Checked the DVD VDD?

YES

IC1301(7, 31, 59, 64, 82, 89, 102, 110)NO

Checked theDVD DSP GND?

YES

CN1202(20, 21)NO

Checked themotor DRV VDD?

YES

CN1602(6)NO

Checked theDVD DSP reset?

6C

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No reading & FILE CHECK display?

YES

CN1602(13)NO

Checked the limit switch?

YES

IC1201(4, 9, 10)NO

Checked the motorDRV mute control?

YES

CN1602(7, 8, 9), CN1203, IC1202(7, 8)NO

Checked themotor loading control?

YES

CN1101(11, 13)NOChecked theDVD DSP control?

YES

IC1201(25, 26)NO

Checked thefocus control?

6A

Fig. 1, 2

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No ejected the disc?

YES

YES

SW1301NO

Checked the eject key?

YES

CN904

NO

Checked theeject control key?

YES


main board control?

CN1602(1, 4)NOChecked the loadingmotor control?

YES

6B

OK

Fig. 1, 2

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7. USB ERROR CORRECTION FLOW CHART

Only NO USB or USB CHECK display?

Something wrong with the USB?

YES

IC1301(78), CN971(5)NO

Checked the USB VDD?

YES

IC1301(81)NO

Checked the USBinterface IC GND?

YES

CN1602(6), IC1301(6)

NOChecked the USB

interface IC reset?

YES

IC1301(79, 80)NO

Checked the D+/D- port?

YES

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WAVEFORMS

Fig.1) SWITCHING CONDITION FOR LOADING

CN1602:[Pin3]CN1602:[Pin13]

CN1602:[Pin1]

CN1602:[Pin2]CHCUKING S/W

LIMIT S/W

8/12 S/W

LOADING S/W

Fig.3) DISC CHECKING FOR LOADING

IC1301:[Pin112]

IC1301:[Pin111]

IC1301:[Pin114]

TCO

FCO

Fig.2) SWITCHING CONDITION FOR UNLOADING

CN1602:[Pin3]CN1602:[Pin13]

CN1602:[Pin1]

CN1602:[Pin2]CHCUKING S/W

LIMIT S/W

8/12 S/W

LOADING S/W

Fig.4) DISC READING FOR LOADING

IC1301:[Pin112]

IC1301:[Pin111]

IC1301:[Pin114]

TCO

FCO

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WIRING DIAGRAM

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WIRING DIAGRAM

MAIN

ANT

REAR IN

LINE OUT6CH

POWERHARNESS

B+, ACC,

PHONE MUTE,

DIMMER,

SPEAKER OUT,

POWER ANT,

HANDBRAKE

WIRED

REMOCON

JACK

DVD

FRONT

19P PLUG

19P SOCKET

30P

24P 4P

PICK UP

13P 2P

SLED SPINDLE LOADING

JK705 CN801

JK401

CN1101 CN1201 CN1202 CN1203

CN901

CN901

CN904 CN1602

30P

2-27 2-28

BLOCK DIAGRAMS

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BLOCK DIAGRAMS1. OVERALL BLOCK DIAGRAM

Tuner STOIRT

RDS

NON RDS

Micro Controller

NEC(16bit)Multi Regulator

(HA13173)

ANT

VOLUME IC

BD3702

MAIN ASSY Line Out

2 V x 4 CH

X 4 SPEAKERS

TB2946Q

53 W MOS

DC.DCCON(5 V)

VIDEO OUTVIDEO AMP

PICKUP

SPEH8202G

(SUNPLUS)

Motor Driver 1

SDRAMFLASH EEPROMCP

CHIP

Motor Driver 2

CD ASSY

TFT-LCD

TOVIS

(3 LANDSCAPE)

VIDEO

DECODER

TW8817

AUX IN/

VIDEO IN

USB

USB

AV

Control Line

Signal Line

FCI 19P CNT

VOLUME

ENCODER

IR Receiver

+

2-302-29

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2. POWER BLOCK DIAGRAM

TUNER MODULE

DVD MODULE

LV25210

8 V 52 mA, 5 V 50mA

IC401

UPD78F1164

20 mA

IC301

HA13173IC601

BD3702FV

48 mA

Power Amp IC

TB2946

Remote

Vb-0.6 V, 480 mA

AUDIO

8.4 V, 400 mA

Back Up

5.6 V, 160 mA

ILL

8.4 V, 400 mA

MPS4462

D.D.CON

DRV 5 V

2327 mA

IC307

BA00CC0WFP

PICK UP 5 V

274 mA

IC303

LM1117 3.3

VD 3.3 V

308 mA

IC306

KIA78R000PI

DVN 1.8 V

202 mA

LC72725

5 V 20 mA

AT93C46

5 V 4 mA

1.8 V202 mA

3.3 VD308 mA

5 V DRV530 mA

5 V P/UP274 mA

8 V MTR140 mA

BACK UP

14.4 V

FRONT MODULE

5 V1 A

3.3 V87 mA

* Maxium reference

1.8 V200 mA

8.4 V140 mA

DVD MTR

8 V 1 A

Variable channels(2,3)

MAIN PART

2-322-31

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DVD/FRONT PART

1.8 V

202.6 mA

3.3 VD

307.75 mA

5 V DRV

(SPINDLE/SLED)

530 mA

(Max.900 mA)

5 V P/UP

274.385 mA

8 V MTR

(LOADING)

140 mA

IC601

XC6221B332NR

177.5 mA

3.3 VD: 32.75 mA

Pick-up

23.4 mA

ICI201

AN41204A

530 mA

(Max.900 mA)

ICI202

BD7931F

100 mA

(Max.200 mA)

3.3 VA: 177.5 mA

1.8 V: 202.6 mA

ICI303

MX25L3205

11 mA

ICI401

64Mbit SDRAM

30 mA

ICI302

S-C24CS08AFJ

10 mA

Pick-up

LD-CD/DVD:209 mA

ICI501

CP 2.0

15 mA

250.985 mA

(70 % Efficiency)

IC1301

SPEH8202G-V

5 V

IC904

LM1117

(3.3 V)

87 mA

IC902

LM1117

(1.8 V)

200 mA

USB 5V1 A

8.4 V

140 mA

3 TFT LCD

10 mA

KNOB LED

140 mA

1.8 V: 190 mA

3.3 V: 57 mA

IC901

TW8817

BACK LIGHT

30 mA

DVD MODULE FRONT MODULE

2-342-33

CIRCUIT DIAGRAMS

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1. MAIN_1 CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R S T

MAIN_1EBY60930101_3_2

2010. 08. 10

2-362-35

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2. MAIN_2 CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12


MAIN_2EBY60930101_3_2

2010. 08. 10

2-382-37

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A

1

2

3

4

5

6

7

8

9

10

11

12


FRONTEBY60930001_1_2

2010. 08. 10

3. FRONT CIRCUIT DIAGRAM

2-402-39

4 USB & AUX CIRCUIT DIAGRAM

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4. USB & AUX CIRCUIT DIAGRAM

A

1

2

3

4

5

6

7

8

9

10

11

12


USB&AUXEBY60871301_1_1

2010. 08. 10

2-422-41

5 EJECT CIRCUIT DIAGRAM

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A

1

2

3

4

5

6

7

8

9

10

11

12


EJECTEBY60871001_1_1

2010. 08. 10

5. EJECT CIRCUIT DIAGRAM

2-442-43

6 DVD 1 CIRCUIT DIAGRAM

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A

1

2

3

4

5

6

7

8

9

10

11

12


DVD_1EBY60871201_1_1

2010. 08. 10

6. DVD_1 CIRCUIT DIAGRAM

2-462-45

7 DVD 2 CIRCUIT DIAGRAM

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A

1

2

3

4

5

6

7

8

9

10

11

12


DVD_2EBY60871201_1_1

2010. 08. 10

7. DVD_2 CIRCUIT DIAGRAM

2-482-47

PRINTED CIRCUIT BOARD DIAGRAMS1. MAIN P.C.BOARD

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1. MAIN P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

2-502-49

2. FRONT P.C.BOARD

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(TOP VIEW)

(BOTTOM VIEW)

2-522-51

3. USB & AUX P.C.BOARD

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47/51

( TOP VIEW ) ( BOTTOM VIEW )

4. EJECT P.C.BOARD


2-542-53

5. DVD P.C.BOARD

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48/51


2-562-55

8/11/2019 LDF900UR (sm-AFN74552044)

49/51

2-582-57

8/11/2019 LDF900UR (sm-AFN74552044)

50/51

2. MECHANISM(PICK-UP) SECTION

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51/51

A03

3-43-3

Documents

LDF900UR (sm-AFN74552044)