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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?
IC601(27)NOChecked the
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
Checked the E-VR VDD?
YES
IC601(27)NO
Checked the E-VR GND?
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
Checked the E-VR VDD?
YES
IC601(27)NO
Checked the E-VR GND?
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
IC401(3)NOChecked the
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
B C D E F G H I J K L M N O P Q R S T
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
B C D E F G H I J K L M N O P Q R S T
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
B C D E F G H I J K L M N O P Q R S T
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
B C D E F G H I J K L M N O P Q R S T
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
B C D E F G H I J K L M N O P Q R S T
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
B C D E F G H I J K L M N O P Q R S T
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
( TOP VIEW ) ( BOTTOM VIEW )
2-542-53
5. DVD P.C.BOARD
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48/51
( TOP VIEW ) ( BOTTOM VIEW )
2-562-55
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49/51
2-582-57
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2. MECHANISM(PICK-UP) SECTION
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A03
3-43-3