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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

NO

YES

YES

YES

YES

NO

NO

Check Pickup.

YES

NO

Check related circuit

of SLED and IC401.

YES

NO

Proper focus

outputs to motor

driver?

Check focus
connection on ES8380
and IC401.

Check P401

connection to Pickup.

YES

NO

Check IC401.

Check P400

connection to pickup.

NO

YES

NO

Check laser power cir-
cuit between ES8380
and Q405, Q406.

YES

NO

Replace the F901.

(Use the same Fuse)

Check P400 connec-

tion to pickup.

Does SLED

move to inner

side when it is at

outer side?

Motor Drive

DRV_MUTE pin

is High?

Do not put

disc and press

switch close?

SLED signal

is OK?

Optical

Lense is moving to

searching focus.

Proper F+& F-

outputs?

Laser turn on

when reading

disc?

DVDLD or

CDLD output

properly?

Pin collector

of Q405& Q406

is OK?

YES

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Summary of Contents for XB12

Page 1: ...RVICE MANUAL P NO AFN35036924 SEPTEMBER 2007 MINI HOME THEATER SERVICE MANUAL MODEL XB12 XBS12V Website http biz lgservice com Internal Use Only CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Page 2: ...CIFICATION 1 7 SECTION 2 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 2 1 SPEAKER EXPLODED VIEW 2 5 PACKING ACCESSORY VIEW 2 7 SECTION 3 ELECTRICAL ELECTICAL TROUBLESHOOTING GUIDE 3 1 WAVEFORMS OF MAJOR CHECK POINT 3 10 INTERNAL BLOCK DIAGRAM OF ICs 3 15 WIRING DIAGRAM 3 23 BLOCK DIAGRAM 3 25 SCHEMATIC DIAGRAMS 3 29 PRINTED CIRCUIT DIAGRAMS 3 39 SECTION 4 REPLACEMENT PARTS LIST REPLACEMENT PARTS ...

Page 3: ...ely 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 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When clea...

Page 4: ...ench 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 1MΩ 6 Care should be taken not to permit the laser p...

Page 5: ...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 co...

Page 6: ...ard Reader etc Portable Device Portable in cable 1 DISPLAY WINDOW 2 POWER FUNC function select button DVD CD PORTABLE FM AM optional USB 3 STOP MO ST SET PLAY PAUSE TUNING Tuner CD SKIP SCAN TUNING Tuner CD SKIP SCAN Volume control knob 4 PORTABLE IN Jack Using PORTABLE device 5 USB port USB Function Compatible Devices To Remove the USB from the unit 6 TIMER CLOCK 7 DISC door ALL ALL ...

Page 7: ...1 16 15 14 13 9 10 11 12 5 6 7 8 RDS RDS PTY PTY 1 POWER 2 FUNCTION SELECT 3 NUMERIC buttons 0 9 4 EQ EQUALIZER Effect XDSS plus 5 SOUND MODE AUDIO SUBTITLE RETURN 6 SETUP 7 left right up down PRESET TUN SELECT ENTER 8 MENU Accesses the menu on a DVD disc 9 PROG MEMO REPEAT REPEAT A B 10 STOP MO ST 11 CLEAR ZOOM MARKER SEARCH SLEEP RDS PTY OPTIONAL 12 VOLUME 13 SKIP 14 TITLE 15 DISPLAY 16 MUTE ...

Page 8: ... and right navigation keys in circulation 3 When entering in version setting mode following option settings can be changed by pushing up or down navigation keys 4 When entering in version setting mode all keys except navigation key and enter key works normal but FLD shows option setting info continuously 5 When Option setting is done push ENTER key then FLD displays WRITE OK 6 Then to change to E2...

Page 9: ...108 0 MHz Intermediate Frequency 10 7 MHz Signal to Noise Ratio 60 55 dB Mono Stereo Frequency Response 140 10000 Hz AM optional Tuning Range 522 1620 kHz or 520 1720 kHz Intermediate Frequency 450 kHz Signal to Noise Ratio 30 dB Frequency Response 140 1800 Hz Output Power Front 5 W 5 W 6 THD 10 Frequency Response 30 20000 Hz Signal to noise ratio 75 dB Speaker Name L R XBS12V Type Bass Reflex1Way...

Page 10: ...0 A43 450 FRONT CABLE3 253 452 A03 265 450 A46 MAIN 290 291 267 450 453 A40 305 453 270 450 272 275 276 273 NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE CABLE2 CABLE1 450 255 CABINET AND MAIN FRAME SECTION SECTION 2 EXPLODED VIEWS ...

Page 11: ...Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 3 2 4 ...

Page 12: ... 2 5 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only MODEL XBS12V SPEAKER EXPLODED VIEW A80A A80B 851 A80 850 852 853 854 855 856 WIRE80 ...

Page 13: ...lectronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 808 Battery 900 Remote Control 801 Instruction Ass y 803 Packing 803 Packing 804 Bag 802 Box 825 Antenna FM PACKING ACCESSORY VIEW ...

Page 14: ... 2 8 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 15: ...01 NO Replace the R901 NO Is the D911 normal NO Replace the D953 NO Replace the IC950 NO Check or Replace the D911 Is the F901 Normal YES NO Replace the PC901 YES NO Replace the D952 Is the D952 Normal YES NO Replace the D955 Is the D955 Normal YES Power Line of Main PCB is short Is the BD901 Normal YES Is the R901 Normal YES YES YES YES IS the D953 normal Is there about 2 5V at the IC950 Pin1 Is ...

Page 16: ...IC951 NO Check or Replace the D952 NO Check the P CTL H signal from µ com YES Is the IC953 pin4 H YES Check or Replace the IC953 No 3 3V YES NO Check or Replace the D955 NO Check the P CTL H signal from µ com Is the Vcc 4 2V supplied to IC952 pin 1 YES YES Check or Replace the IC952 No 5 0 V No 9V YES Is the Vcc 5 6V supplied to IC951 pin 1 Is the IC951 pin4 H Is the Vcc 10 5V supplied to IC953 pi...

Page 17: ... YES NO CONNECTOR CHECK NO SMPS CHECK IC104 PIN49 NO CHANGE IC104 P SENSE P1702 PIN4 CHECK CHECK OUTPUT FROM IC701 YES YES YES CHECK PATH FROM IC701 TO IC702 CHECK IC701 PIN1 9V CHECK IC702 PIN3 10V AUDIO AB NORMAL CHECK INPUT FOR IC702 PIN4 12 NO CHECK OUTPUT JK701 CHECK PATH FROM IC702 TO JK701 NO NO NO CHECK SMPS CHECK SMPS NO NO CHECK OUTPUT IC702 ...

Page 18: ...nal Input JK101 YES Check Output IC701 Pin12 17 Check Input for IC701 Pin4 25 Tuner YES NO Check TU701 Pin3 5 YES Check Output IC701 Pin12 17 Check Input for IC701 Pin5 24 DVD USB For XB YES NO ES8380 Pin117 123 124 1 NO Check IC507 Pin9 5V YES Check Output IC507 Pin7 10 YES Check Input for IC701 Pin6 23 YES Check Output IC701 Pin12 17 Check Input for IC507 Pin1 2 3 4 ...

Page 19: ...SE SIGNAL CHECK X101 OSCILLATION REPLACE IC104 NO REFER TO P SENSE CHECK NO CHANGE X101 NO CHECK RESET CIRCUIT NO CHECK P1702 PIN1 MICOM IC104 TROUBLESHOOTING CHECK IC701 PIN1 9V YES YES CHECK CONTROL FUNCTION NO CHECK CLK DATA BY CHANGE FUNCTION FROM TUNER TO PORTABLE NO CHANGE IC701 NO CHECK SMPS IC701 TROUBLESHOOTING CHECK IC104 PIN53 RESET CHECK IC104 CLK DATA PIN14 15 ...

Page 20: ...CHECK SMPS FMAM TUNER CHECK DVD USB CHECK TUNER OPERATION Power On YES NO YES YES NO YES NO NO ES8380 operates properly Check path between Flash ROM and ES8380 Check path between SDRAM and ES8380 Check Pin133 134 137 138 13 9 140 of ES8380 NO Replace Flash ROM IC502 NO Replace SDRAM IC503 NO Replace ES8380 IC501 Show Logo Does Flash ROM operates properly Does SDRAM operates properly ...

Page 21: ...ion to Pickup YES NO Check IC401 Check P400 connection to pickup NO YES NO Check laser power cir cuit between ES8380 and Q405 Q406 YES NO Replace the F901 Use the same Fuse Check P400 connec tion to pickup Does SLED move to inner side when it is at outer side Motor Drive DRV_MUTE pin is High Do not put disc and press switch close SLED signal is OK Optical Lense is moving to searching focus Proper ...

Page 22: ...le related circuit on ES8380 NO Check SPINDLE control of IC401 Check P401 connection with pickup Does spindle rotate Proper spindle signal on ES8380 YES Proper SPIN SPIN YES NO YES NO Check connection between P400 to pickup NO Check related circuit of ES8380 Focus Signal Check P400 connec tion with pickup Focus On OK Proper signal on A B C D from pickup YES Proper FOD signal on IC401 pin5 YES ...

Page 23: ...0 NO Check Tracking control on IC401 Check P400 connec tion with pickup Track On OK Proper TRO signal on IC401 YES T T output properly YES YES NO Check RF Signal Waveform Disc Play YES NO Video Output OK NO Check picture signal data on ES8380 pin110 and check mute signal on Q503 Video Output OK NO Refer on DVD USB Function Audio Abnormal Checking All output OK All output OK ...

Page 24: ...s Inc All right reserved Only for training and service purposes LGE Internal Use Only WAVEFORMS OF MAJOR CHECK POINT 1 WHEN POWER ON RESET DATA ETC WAVEFORM 1 RESET DVD 2 RX 3 TX 4 LCS3 FLASH Playing at USB function 1 HRST 2 5V 3 D 4 D ...

Page 25: ...onics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 OPEN CLOSE WAVEFORM AT POWER ON 3 STARTING ACTION WAVEFORM IN MD DEVICE 1 Limit SW 2 OPEN 3 CLOSE 1 SLO from MPEG 2 SLED 3 SLED At Power on ...

Page 26: ... 3 12 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 4 FOCUS WAVEFORM 1 FDO 2 F 3 F INSERT CD INSERT DVD 1 FDO 2 F 3 F ...

Page 27: ...007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 5 AT POWER ON SPINDLE SIGNAL AT MD DECK 6 AT FIRST ACTION FOCUS SIGNAL A B C D 1 Spind 2 Spin 3 Spin 1 A 2 B 3 C 4 D ...

Page 28: ... 3 14 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 7 TRACKING SIGNAL 8 RF WAVEFORM 1 Tro 2 Tr 3 Tr ...

Page 29: ... 3 15 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 9 DISK TYPE JUGEMENT WAVEFORM DVD 1 F 2 FDO 3 SVRRF CD ...

Page 30: ... 3 16 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only INTERNAL BLOCK DIAGRAM OF ICs IC78960NW E 1 BIOCK DIAGRAM ...

Page 31: ... 3 17 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only IC78960NW E 2 PIN CONFIGURATION ...

Page 32: ... control Standby control IR PLA Bus interface Port 0 Port 1 SIO0 SIO1 Timer 0 Timer 1 Timer 4 Timer 5 Port 2 Port 7 Port 8 ADC ALU Flash ROM PC ACC B register C register PSW RAR RAM Stack pointer Watchdog timer CF RC Xítal MRC Clock generator UART2 On chip Debugger ROM correct PWM2 3 UART1 Base timer Port C Timer 6 INT0 to INT7 Noise filter Port 3 Timer 7 ...

Page 33: ...21 20 19 18 17 48 41 16 15 14 13 12 11 10 9 8 7 6 5 4 1 2 3 33 4 35 7 38 0 43 45 47 46 P70 INT0 T0LCP AN8 P71 INT1 T0HCP AN9 P72 INT2 T0IN NKIN P73 INT3 T0IN RES XT1 AN10 XT2 AN11 VSS1 CF1 CF2 VDD1 P80 AN0 P81 AN1 P82 AN2 P10 SO0 P11 SI0 SB0 P32 UTX1 P33 URX1 P34 UTX2 P35 URX2 P36 P37 P27 INT5 T1IN P26 INT5 T1IN P25 INT5 T1IN P24 INT5 T1IN INT7 P23INT4 T1IN P22 INT4 T1IN P21 INT4 T1IN P20 INT4 T1I...

Page 34: ...Only for training and service purposes LGE Internal Use Only PT6524 1 BIOCK DIAGRAM COMMON DRIVER CLOCK GENERATOR SEGMENT DRIVER LATCH SHIFT REGISTER ADDRESS DETECTOR VDD1 COM1 DI CLK CE COM2 COM3 COM4 SG51 SG50 SG13 SG12 P12 SG2 P2 SG1 P1 VDD2 INH OSC VDD VSS ...

Page 35: ...P12 SG8 P8 SG 13 SG9 P9 SG 14 SG10 P10 SG 15 SG11 P11 SG 16 17 18 19 20 21 22 23 28 24 29 25 30 26 31 27 32 38 33 39 34 40 35 41 36 42 37 43 44 45 46 47 48 54 49 55 50 56 51 57 52 58 53 59 60 61 62 63 64 SG17 SG18 SG19 SG20 SG21 SG24 SG29 SG23 SG28 SG22 SG25 SG30 SG26 SG31 SG27 SG32 SG38 SG33 SG39 SG34 SG40 SG35 SG41 SG36 SG42 SG37 SG43 SG44 SG45 SG46 SG47 SG48 COM3 SG49 COM4 SG50 VDD SG51 VDD1 CO...

Page 36: ... 3 22 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 37: ... 3 23 3 24 WIRING DIAGRAM LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 38: ... PWM IC 9V 78R09 5V P SENS 5 6VA KIA278R05 P7102 FEED BACK 3 3V 278R33 RECTIFICATION SMOOTHING CIRCUIT BLOCK DIAGRAM 1 SMPS BLOCK DIAGRAM Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 39: ...d Only for training and service purposes 3 27 3 28 SANYO MICOM IC PT6524 LCD DRIVER IC LCD DISPLAY LC78692N SANYO DSP IC AM5810 SERVO IC TDA7266SA AMPLIFIER IC CD PICK UP TDA7468D FUNCTION IC PORTABLE INPUT TUNER MODULE LCD DATA CLK A_MUTE AMP_STBY 2 MAIN FRONT BLOCK DIAGRAM ...

Page 40: ...EMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF FER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmeter durin...

Page 41: ... Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 3 31 3 32 2007 08 24 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 2 MAIN SCHEMATIC DIAGRAM ...

Page 42: ...pyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2007 08 24 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 3 FRONT SCHEMATIC DIAGRAM ...

Page 43: ...E Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 2007 08 24 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 4 MPEG SCHEMATIC DIAGRAM ...

Page 44: ...08 24 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 5 MOTOR SERVO SCHEMATIC DIAGRAM Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 45: ...t 2007 LG Electronics Inc All right reserved Only for training and service purposes NOTES Warning NOTES Parts that are shaded are critical NOTES with respect to risk of fire or NOTES electricial shock PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD ...

Page 46: ... 3 41 3 42 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 FRONT P C BOARD TOP VIEW ...

Page 47: ... 3 43 3 44 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes FRONT P C BOARD BOTTOM VIEW ...

Page 48: ... 3 45 3 46 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

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