LG LCS500UN Service Manual Download Page 10

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2-1

SECTION 2 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

1. SYSTEM CONTROL ERROR CORRECTION FLOW CHART

No power?

Something wrong with the system control?

YES

F301 Inside of CN302

YES

Checked the Fuse?

CN302(1, 2, 3)

YES

Checked the Back up

Vdd and Gnd?

IC301(15, 14)

YES

Checked the Regulator

Back up Vdd ?

IC402(30, 47, 50, 99, 100)

YES

Checked the Main

Micom Vdd?

IC402(20, 51, 97, 98)

YES

Checked the Main

Micom GND?

X401, X402

YES

Checked the Main

Micom X-tal?

IC401, IC402(90)

Checked the Main

Micom Reset?

Q301, R408, IC402(38)

YES

Checked the ACC in?

SW402, IC402(87)

YES

Checked the detachable

switch?(LCF Series only)

IC402(53, 54),

LCS Series : PN901(16, 17)

LCF Series : PN902(9, 10)

YES

Checked the Front

Panel KEY input?

IC402(56)

YES

Checked the Main Micom

B+ Detect ?

Summary of Contents for LCS500UN

Page 1: ...CEMBER 2010 CAR CD MP3 WMA RECEIVER SERVICE MANUAL MODEL LCS500UN CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com Internal Use Only MODEL LCS500UN SERVICE MANUAL ...

Page 2: ... 2 11 6 USB ERROR CORRECTION FLOW CHART 2 14 7 BLUETOOTH ERROR CORRECTION FLOW CHART OPTIONAL 2 16 8 AUX ERROR CORRECTION FLOW CHART 2 17 WAVEFORMS 2 18 CIRCUIT VOLTAGE CHART 2 20 INTERNAL BLOCK DIAGRAM OF ICs 2 23 1 IC301 HA13173AH 2 23 2 IC801 TB2946HQ 2 25 3 IC802 BD3702FV 2 26 4 IC901 MC5502 2 27 WIRING DIAGRAM 2 29 BLOCK DIAGRAM 2 31 CIRCUIT DIAGRAMS 2 33 1 MAIN CIRCUIT DIAGRAM 2 33 2 FRONT C...

Page 3: ...he 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 whi...

Page 4: ...harges 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 comparab...

Page 5: ...Distortion 1 0 Usable Sensitivity 28 dBµV CD Frequency Response 20 Hz 20 kHz S N Ratio 80 dB Distortion 0 12 Channel Separation 1 kHz 55 dB AUX Frequency Response 20 Hz 20 kHz S N Ratio 80 dB Distortion 0 1 Channel Separation 1 kHz 45 dB Max Input Level 1 kHz 1 1 V Bluetooth optional TX POWER 4 dBm Frequency Range 2402 2480 MHz Version Bluetooth Specification 2 0 EDR USB Version USB 1 1 Line OUT F...

Page 6: ...ves sound quality H DISP Press it you can check the clock time Press and hold it you can turn off the display light I S Releases a disc J Opens the front panel K Mute Temporarily stops the sound L Returns to the previous step M W X Skip Search Seek Tune N FUNC In each mode sets playback items O X Plays and pauses playback P INT Intro scan Q RPT Repeat function R SHF Shuffle S Numeric buttons Selec...

Page 7: ... Completion When Upgrade finished the display shows up DOWN OK After a while the audio set is reset automatically Caution If power is off on the way of upgrading firmware the set can t be recovered Therefore pay lots of attention for power not to be off BLUETOOTH FIRMWARE UPGRADE OPTIONAL 1 Insert the burned disc into the LCS700 LCF800 and wait until DOWNLOAD is on LCD 2 Press 1 key for about 1 s ...

Page 8: ...cted to the audio set via its shapes matched each other We need power supply for operation of audio set Voltage 12 15 V Current Over 2 A Before connection between set and power supply adjust voltage level to 15 V typically It is okay up to 12 V Power Supply has a variety of shapes and capacity of voltage and current At first check these things HOW TO CONNECT AUDIO SET TO POWER SUPPLY ...

Page 9: ...1 8 ...

Page 10: ...ulator Back up Vdd IC402 30 47 50 99 100 YES NO Checked the Main Micom Vdd IC402 20 51 97 98 YES YES NO Checked the Main Micom GND X401 X402 YES NO Checked the Main Micom X tal IC401 IC402 90 NO Checked the Main Micom Reset Q301 R408 IC402 38 YES NO Checked the ACC in SW402 IC402 87 YES NO Checked the detachable switch LCF Series only IC402 53 54 LCS Series PN901 16 17 LCF Series PN902 9 10 YES NO...

Page 11: ...ble to Volume control OK YES EV901 IC402 82 83 LCS Series PN901 6 7 LCF Series PN902 18 19 YES NO Checked the Encoder Volume YES IC402 9 10 IC802 25 26 NO Checked the Volume IC Control 1B Not available to Key Control OK YES LCS Series SW901 SW917 LCF Series SW901 SW913 YES NO Checked the Tact switch YES IC402 53 54 LCS Series PN901 16 17 LCF Series PN902 9 10 NO Checked the Key line 1C ...

Page 12: ...el Mute input YES IC402 14 15 IC802 15 NO Checked the Mute Control 1D Not available to ANT Motor Type Control OK YES D430 IC301 12 13 IC402 33 NO Checked the ANT control YES 1E Not available to Remote Power AMP control OK YES CN302 8 Q320 Q319 IC402 36 NO Checked the Remote control YES 1F ...

Page 13: ...C802 15 IC402 15 YES NO Checked the E VR Mute Control IC802 1 2 3 4 5 6 7 9 18 19 20 21 22 23 YES YES NO Checked the E VR Signal in out IC801 1 2 8 13 18 24 YES NO Checked the Power IC Ground IC801 23 NO Checked the Power IC Vdd IC801 4 22 IC402 22 32 YES NO Checked the Power IC Control IC801 3 5 7 9 11 12 14 15 17 19 21 23 YES NO Checked the Power IC Signal in out CN302 11 12 13 14 15 16 17 18 YE...

Page 14: ...ntorl YES 2A No Sound External AMP OK YES IC802 18 19 20 21 22 23 NO Checked the Line Out Signal YES Q603 Q604 Q605 Q606 Q608 IC402 15 NO Checked the Line Out AMP Mute Control YES JK601 NO Checked the Line Out AMP Signal in out YES 2B No output Beep sound OK YES YES IC402 80 IC802 14 NO Checked the Beep Control 2C ...

Page 15: ...ng all the pin of IC Prevent crack of solder line Keep changed IC We request that you send it to HQ 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 O...

Page 16: ... LCD901 10 NO Checked the LCD Driver Ground YES LCS Series IC901 57 IC402 79 NO Checked the LCD Driver Reset YES LCS Series IC901 61 LCF Series LCD901 6 NO Checked the LCD Driver OSC YES LCS Series IC402 44 46 74 79 PN901 2 8 18 19 IC901 57 62 63 64 LCF Series IC402 44 46 74 79 PN902 7 8 17 23 LCD901 2 3 4 5 NO Checked the LCD Driver data interface YES LCS Series IC901 1 55 LCD Check the short NO ...

Page 17: ...mer control input YES IC301 4 Q303 IC402 61 NO Checked the RED LED Vdd YES YES LCS Series LD921 LD945 LCF Series LD921 LD936 NO Checked the RED LED OK YES IC301 4 Q304 IC402 43 NO Checked the BLUE GREEN LED Vdd YES LCS Series LD951 LD975 LCF Series LD951 LD966 NO Checked the BLUE GREEN LED 3A ...

Page 18: ...to LCD Lighting control OK YES CN302 7 IC301 9 NO Checked the Dimmer control input YES 3B YES IC301 4 Q302 IC402 49 NO Checked the White LED Vdd YES LCS Series LD991 LD992 LCF Series LD990 LD993 NO Checked the White LED ...

Page 19: ...K YES IC101 6 22 NO Checked the Tuner Vdd YES IC301 10 11 IC402 40 D417 NO Checked the Tuner Vdd control YES IC101 5 10 17 23 NO Checked the Tuner Ground YES IC802 15 IC402 15 NO Checked the E VR Mute Control YES IC101 18 19 IC402 3 4 NO Checked the I2C data YES IC101 8 9 NO Checked the Audio Signal YES ...

Page 20: ...7 81 102 104 116 117 NO Checked the CD DSP Ground YES IC504 7 8 20 NO Checked the Motor DRV Vdd YES CN520 19 NO Checked the CD DSP Reset YES X501 4 2336 MHz NO Checked the CD DSP X tal YES CN506 2 NO Checked the Disc in load switch YES CN520 21 23 NO Checked the Loading Motor Control YES CN506 1 NO Checked the 12 8 cm sense switch Fig 1 2 Fig 3 4 Fig 1 2 5A 5B 5C ...

Page 21: ...r Loading Control YES CN520 1 3 4 5 NO Checked the CD DSP Control YES IC501 111 IC504 15 16 NO Checked the Focus Control YES YES IC501 82 NO Checked the RF signal out check Fig 1 2 Fig 3 4 YES IC501 107 IC504 11 12 NO Checked the Spindle motor Control YES IC503 109 IC504 13 14 NO Checked the SLED Control YES IC501 113 IC504 17 18 NO Checked the tracking Control 5A ...

Page 22: ...2 13 Fig 3 4 CD no sound OK YES IC501 46 47 NO Checked the DSP signal out YES No ejected the CD OK YES IC402 54 NO Checked the Eject key YES CN520 21 23 NO Checked the Loading Motor Control YES 5B 5C ...

Page 23: ...IC302 YES NO Checked the USB Vdd YES IC501 4 5 7 9 12 44 49 51 74 77 81 102 104 116 117 NO Checked the USB interface IC Ground YES CN520 19 NO Checked the USB interface IC Reset YES X501 NO Checked the USB interface IC X tal YES IC501 52 53 NO Checked the D D Port YES IC501 52 53 NO Checked the USB indication Port ...

Page 24: ...4 77 81 102 104 116 117 NO Checked the CD DSP Ground YES CN520 19 NO Checked the USB interface IC Reset YES X501 NO Checked the DSP X tal CN520 1 3 4 5 NO Checked the DSP Control YES 6A USB no sound OK YES IC501 52 53 NO Checked the CD DSP signal out YES 6B OK ...

Page 25: ...ist NO Checked the BT phone list YES CN403 13 NO Checked the BT module Vdd YES CN403 14 NO Checked the BT module 5 V YES IC402 1 2 71 72 NO Checked the BT module data interface YES No sound OK YES CN403 13 NO Checked the BT Vdd YES CN403 1 2 3 NO Checked the BT audio data YES YES IC802 3 4 NO Checked the E VR signal in out 7A ...

Page 26: ...K Something wrong With the AUX YES LCS Series JK903 IC802 7 9 CN901 15 17 19 PN901 3 4 5 LCF Series JK903 IC802 7 9 CN971 20 21 22 PN902 20 21 22 NO Checked the AUX Signal input YES See the Sound Error correction Process NO Checked the E VR Power AMP YES ...

Page 27: ...OTH MODULE CN403 IC402 PIN71 IC402 PIN72 2 MICOM IC402 DISPLAY LCS SERIES CN901 LCF SERIES CN902 IC402 PIN46 IC402 PIN44 IC402 PIN74 IC402 PIN79 3 MICOM IC402 TUNER IC IC101 IC402 PIN4 IC402 PIN3 4 MICOM IC402 VOLUME IC IC802 IC402 PIN9 IC402 PIN10 ...

Page 28: ...2 SWITCHING CONDITION FOR UNLOADING CN506 PIN2 CN506 PIN1 CN506 PIN8 CN506 PIN11 LOADING S W 12 8 S W CHUCKING S W LIMIT S W Fig 3 MOTOR CONTROL SIGNAL FOR LOADING CN520 PIN21 CN520 PIN23 CN506 PIN9 CN506 PIN10 LO LO REW FEW LO LO REW FEW Fig 4 MOTOR CONTROL SIGNAL FOR UNLOADING CN520 PIN21 CN520 PIN23 CN506 PIN9 CN506 PIN10 2 CDP PART ...

Page 29: ... AMSELOUT2 6 8 IC301 PIN PIN NAME VOLTAGE TUNER MODE CD MODE B T MODE USB MODE 1 GND 0 0 0 0 2 FREG_B 13 6 3 FREG_F 1 24 4 ILL_8 4 8 4 8 4 8 4 8 4 5 CTL4 FREG 5 6 CD_8 V 8 8 8 8 7 DSP_3 3 V 3 3 3 3 3 3 3 3 8 BACK UP 14 1 14 1 14 1 14 1 9 CTL3 ILL 5 5 5 5 10 AUDIO_8 4 V 8 4 8 4 8 4 8 4 11 CTL1 6 7 10 5 5 5 5 12 EXT P ANT 13 8 13 8 13 8 13 8 13 CTL2 P ANT 5 5 5 5 14 VDD_5 6 V 5 6 5 6 5 6 5 6 15 BACK...

Page 30: ...N PIN NAME VOLTAGE 1 DI 0 2 AGND 0 3 DO 0 4 LCH 0 5 CLK 0 6 AGND 3 259 7 LOAD_SW 0 8 RCH 4 99 9 LG2TA 4 98 10 AGND 4 98 11 CE 0 12 8 V 0 13 TA2LG 8 05 14 3 3 V 0 15 GND 0 16 GND 4 78 17 GND 0 18 GND 5 19 RESET 4 98 20 GND 0 21 FEW_IN 4 99 22 GND 5 02 23 REW_IN 0 24 GND 4 76 25 8 12 4 76 26 GND 1 54 27 RESERVED 2 52 28 GND 2 52 29 CHUK_SW 5 06 30 GND 0 02 CN403 PIN PIN NAME VOLTAGE 1 BT_L 2 5 2 AGN...

Page 31: ...2 22 ...

Page 32: ...ge detect TSD VREF CDOUT VREF EXTOUT VBUP DSPOUT CTL 2 2 5V CTL 3 2 5V CTL 4 2 5V 15 FREG F RFREG3 FREG B 13 12 11 10 9 8 7 6 5 4 3 2 1 14 3 5V DBUP CBUP 100uF CVDD 10uF CDSP 10uF CAUDIO 10uF CCD 0 1uF CEXT 10uF CILM 0 1uF CFREG 10uF QFREG RFREG1 RFREG2 DEXT1 DEXT2 C1 100uF C2 0 1uF INTERNAL BLOCK DIAGRAM OF ICs ...

Page 33: ...hermal shut down prevents thermal damage to the IC All outputs except VDD pin14 and FREG pin2 3 are switched off when the circuit operates revert to the original state when the tem perature drops to a certain level Note3 Overvoltage protection circuit The overvoltage protection circuit surge protector turns off all outputs without Vdd when VB voltage is more than about 21V And the overvoltage prot...

Page 34: ...VCC1 VCC2 TAB Ripple C2 B C3 C5 9 Out1 11 C1 8 7 PW GND1 Out1 IN1 5 Out2 12 C1 2 3 PW GND2 Out2 IN2 17 Out3 15 18 19 PW GND3 Out3 IN3 21 Out4 14 C1 24 23 PW GND4 Out4 IN4 13 16 C1 C6 4 Stby 25 22 Mute C4 R1 Play Mute RL RL RL RL Pre GND AC GND Offset short ...

Page 35: ... of 1ch 12 EN2 E negative input terminal of 2ch 13 EP2 E positive input terminal of 2ch 14 MIN Mixing input terminal Terminal Terminal Description No Name 15 MUTE External compulsory mute terminal 16 LRST Level meter reset terminal 17 LOUT Output terminal for Level meter 18 OUTS2 Subwoofer output terminal of 2ch 19 OUTS1 Subwoofer output terminal of 1ch 20 OUTR2 Rear output terminal of 2ch 21 OUTR...

Page 36: ...2 27 4 IC901 MC5502 4 1 PIN CONFIGURATION 4 2 BLOCK DIAGRAM ...

Page 37: ...O LCD Segment output pins 52 SEG52 COM0 O LCD Segment output pin or LCD Common output pin SEG52 in 1 3 Duty use COM0 in 1 4 Duty use 53 55 COM1 COM3 O LCD Common output pins 57 INH I Display off control input pin INH VSS Display forced off INH VDD Display on 58 59 VLC1 VLC2 I O LCD power supply 61 OSC I O Oscillator output pin 62 CE I Chip enable input pin 63 SCK I Shift clock input pin 64 SI I Se...

Page 38: ...02 30PIN CN520 ANT LINE OUT 4CH SK101 JK601 POWER HARNESS CN302 B ACC Phone Mute Dimmer Speaker Out Power Ant 8PIN CN301 8PIN CN599 MICOM DSP USB Tuner Signal 17PIN CN519 Pick Up 11PIN CN506 Motor External AMP LCS SERIES 1LINE LCD VA TYPE LCF SERIES 3LINE LCD VA TYPE 3PIN CN405 Wired Remocon ...

Page 39: ...LEVEL METER I2C RR SW 87F14C8A CTL4 Vref 10 USB SW_OUT B BACK UP VOLUME UP DN BACK UP 14 4V BT MODULE LBMX 2CC9B VDD_3 3V T AUDIO 8 4V F VOLUME1 MUTE VDD TIMER SPD C SVDD 30 47 50 99 100 PIN 40mA F AGND 78K0 CPU 6 SL SWITCH1 LD F PWR_5V B DETACT VDD_5V B RR LINE OUT BLOCK MIX USB FLMD0 FRONT BLOCK CD_LOAD_SW Total 71 SPD LED 8 4V REMOCON_5V SWITCH2 LIMIT_SW LCD 8 4V WDT CLOCK 240KHz SL INPUT GAIN ...

Page 40: ...CIRCUIT DIAGRAMS 1 MAIN CIRCUIT DIAGRAM 2 33 2 34 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 EBY60748501 LCF600 LCS500 2010 06 17 ...

Page 41: ...2 FRONT CIRCUIT DIAGRAM 2 35 2 36 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 FRONT EBY60748801 LCS700 500 300 2009 12 04 ...

Page 42: ...2 37 2 38 3 CDP 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 CDP EBY60708101 LCF600 LCS500 2010 06 17 ...

Page 43: ...PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD 2 39 2 40 TOP VIEW BOTTOM VIEW ...

Page 44: ...2 FRONT P C BOARD 2 41 2 42 TOP VIEW BOTTOM VIEW ...

Page 45: ...3 CDP P C BOARD TOP VIEW BOTTOM VIEW 2 43 2 44 ...

Page 46: ...290 290A A43 A46 A45 A26 A50 274 279 281 282 LCD901 280 284 285 277 283 453 258 255 257 254 A42 256 252 253 450 294 293 451 451 451 298 456 452 451 451 451 297 292 250 251 454 451 CDP CABLE1 A41 276 Accessory Loc No Loc No Loc No 801 808 818 Loc No 900 Loc No 835 Loc No 850 450 ...

Page 47: ...3 3 3 4 2 MECHANISM PICK UP SECTION 2 1 A26 A03 ...

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