LG MDS902S, Service Manual

Page 1: ...ERVICE MANUAL MODEL MDV902 MDS902V MDS902S MDS902W CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL MDV902 MDS902V MDS902S MDS902W SERVICE MANUAL P NO AFN35036903 JULY 2007 http biz lgservice com ...

Page 2: ...AF330W20FT 3 14 4 AF350W01FT 3 16 WIRING DIAGRAM 3 18 BLOCK DIAGRAM 3 20 SCHEMATIC DIAGRAMS 3 22 1 SMPS POWER SCHEMATIC DIAGRAM 3 22 2 SUB SMPS POWER SCHEMATIC DIAGRAM 3 24 3 AUDIO MAIN SCHEMATIC DIAGRAM 3 26 4 DECK SCHEMATIC DIAGRAM 3 28 5 USB AUX2 HEADPHONE AMP SCHEMATIC DIAGRAM 3 30 6 I O JACK SCHEMATIC DIAGRAM 3 32 7 AMP SCHEMATIC DIAGRAM 3 34 8 WOOFER AMP SCHEMATIC DIAGRAM 3 36 9 FRONT SCHEMA...

Page 3: ...e adjustment point and installation screws should absolutely 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 ca...

Page 4: ...ed 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 pick up to come in contact with clothing in order to preve...

Page 5: ...harges 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 comparabl...

Page 6: ...UAL TUNING CD SKIP SKIP CLOCK ADJUST b KEY CON KEY CONTROL 8 HEADPHONE Jack PHONES ø6 3mm 9 GAME LINK connector VIDEO IN AUDIO L R USB connector 10 PUSH EJECT position TAPE 1 PUSH EJECT position TAPE 2 11 MIC VOLUME knob MIC VOL MIC Jacks MIC1 MIC2 ø6 3mm OPTIONAL 12 OAO button 13 AUTO TUNING DOWN UP button REWIND FAST FORWARD TEMPO DOWN TEMPO UP PRESET DOWN UP button STOP CLEAR button BACKWARD PL...

Page 7: ...MENU button Use the MENU button to display the menu screen included on DVD video discs 9 STOP PAUSE STEP PLAY buttons 10 PROG MEMO REPEAT REPEAT A B buttons 11 EQ OAO FEMALE AUDIO MALE SUBTITLE S TITLE SHADOW CLEAR buttons 12 ECHO VOL buttons 13 MIC VOL buttons 14 RDS PTY buttons OPTIONAL 15 XDSS SURROUND SURR ZOOM RETURN buttons 16 MARKER SEARCH MUTE buttons SCAN TEMPO KEY CON b SKIP 17 VOLUME bu...

Page 8: ...SPEED Signal to noise ratio video More than 55dB 1kHz Wow Flutter 0 25 Dynamic range audio More than 75dB MTT 111 JIS WTD Video output 1 0V p p 75Ω F F REW Time 120sec C 60 S video output Y 1 0V p p 75Ω Frequency Response 125 8000Hz C 0 3V p p 75Ω Signal to Noise Ratio 43dB Component Video output Y 1 0V p p 75Ω Channel Separation 50dB P B 45dB R P Pb Pr 0 7V p p 75Ω Erase Ratio 55dB MTT 5511 SPEAK...

Page 9: ...1 8 MEMO ...

Page 10: ...46U 454 266 450 450 453 265 450 292 450 261 293 274 268 270 271 A43 450 289 A00 291 450 277 281 451 282 455 A46J 276 453 296 450 278 301 283 456 450 283 450 453 A47 456 454 450 A46 450 274 269 CABLE5 A56 454 280 450 290 454 454 454 279 457 450 FAN 294 305 A52 285 CABLE1 260 259 265 450 288 255 250 450 450 CABLE6 248 A51 450 302 275 A41 A26 CABLE2 CABLE4 CABLE3 2 1 2 2 SECTION 2 EXPLODED VIEWS CABI...

Page 11: ...2 3 2 4 TAPE DECK MECHANISM EXPLODED VIEW 1 TAPE DECK MECHANISM A R A S LEFT A R DECK A00 001 003 009 009 011 013 A02 002 008 007 006 021 019 018 017 A01 023 025 015 022 037 020 ...

Page 12: ...2 5 2 6 2 TAPE DECK MECHANISM A R A S RIGHT A S DECK A00 003 009 011 013 009 A03 023 022 015 020 021 019 018 017 016 025 007 008 ...

Page 13: ...5 164 417 166 167 417 416 177 172 175 180 417 430 430 162 168 419 155 417 173 153 418 156 170 163 440 441 036 012A 012A 021 430 435 431 024 025 439 432 030 181 418 169A 169B 169C 169 A30 012A 035 438 035A DVD MECHANISM EXPLODED VIEW ...

Page 14: ...53 854 855 856 859 863 858 867 865 861 860 862L 859 866 WIRE81 858 A80AL A80BL A80R 850R 857 851 852 853 854 856 855 859 863 858 867 865 861 860 862R 859 866 WIRE80 858 A80AR A80BR SPEAKER EXPLODED VIEW 1 MODEL MDS902V FRONT SPEAKERS ...

Page 15: ...2 11 2 12 A60L 650L 651 654 652 653 658 659 656 657 660 662 661 WIRE61 A60BL 655 654 A60AL A60R 650R 651 654 652 653 658 659 656 657 660 662 661 WIRE60 A60BR 655 654 A60AR 2 MODEL MDS902S REAR SPEAKERS ...

Page 16: ...2 13 2 14 A B B A A90 A90A 950 951 952 953 954 955 960 961 962 957 956 963 966 WIRE90 WIRE91 958 959 A90B 964 965 3 MODEL MDS902W SUBWOOFER ...

Page 17: ...2 15 2 16 MEMO MEMO ...

Page 18: ...2 17 PACKING ACCESSORY SECTION ...

Page 19: ...CE FUSE CHECK BD901 TO PIN IMPEDANCE LOW IMPEDANCE CHANGE ASSY CHECK C986 VOLT 5 6V CHECK LINE SHORT CHECK CONNECTION CN902 CN903 NO SOUND INSERT POWER CORD AFTER 10 SECONDS CHECK THE AMP MODULE SHORT CHECK C961 C951 VOLT OVER 40V CHANGE FR971 972 974 975 CHECK C958 C968 VOLT OVER 9V PORTECTION CHECK NO SOUND LISTS DISPLAY INSERT POWER CORD AFTER 1 MINUTE ...

Page 20: ...4 6PIN 5 1V CHECK MAIN PCB PATTERN CUTTING AND SHORT CHECK IC304 KIA7042 CHANGE µ COM IC302 1PIN 4 4V CHECK NO YES FRONT PN304 35PIN 5 1V CHECK YES YES FRONT IC304 RESET IC STATE CHECK IC304 INPUT VOLTAGE 5V OVER STATE CHECK AND OUTPUT VOLTAGE 4V OVER STATE CHECK NO 3 VKK CHECK VKK CHECK YES YES CN710 10PIN DC 32V CHECK SMPS TROUBLESHOOTING CONSULT NO IC301 50PIN VOLTAGE CHECK ...

Page 21: ...302 CHANGE MICOM IC302 CHANGE IC302 CHANGE RESET IC302 10PIN CHECK LOW HIGH Q302 Q303 STATE CHECK NO NO YES YES YES YES P SENS CHECK NO P SENS TROUBLESHOOTING CONSULT X301 X302 CHANGE TR Q302 Q303 CHANGE IC302 VDD 19 20 59 PIN VOLTAGE CHECK PN304 34PIN 5 6V MI CHECK NO NO NO YES X301 9 8304MHz X302 32 768KHz VIBRATION SIGNAL CHECK NO YES YES MAIN CN710 6PIN CHECK SMPS TROUBLESHOOTI NG CONSULT ...

Page 22: ... FAULTY IS CHANGE EACH PART TR CHANGE 6 MUTING TROUBLESHOOTING MUTE STATE EXPEND IC IC501 502 STATE EXPEND IC OK YES YES D553 D551 1SS133 CHANGE D553 D551 1SS133 CHECK 16PIN VDD VOLTAGE CHECK NO NO YES YES YES PCB PATTERN CHECK MICOM IC302 39 44PIN CHECK CLK1 2 3 EXP CLK CHECK NO NO YES YES YES PCB PATTERN CHECK MICOM IC302 72PIN CHECK 2 EXP DATA CHECK NO NO YES YES EXPEND IC FAULTY IS CHANGE 4PIN...

Page 23: ...HANGE YES IC502 4PIN REC SW LOW STATE REC IC502 4PIN REC SW HIGH CHECK Q212 C HIGH CHECK NO YES Q213 C LOW CHECK YES IC502 13PIN REC BAIS HIGH CHECK YES L203 4 7mH COIL VIBRATION CHECK YES IC601 7 32 INPUT REC SIGNAL CHECK YES IC601 3 36PIN INPUT SIGNAL CHECK DECK HEAD WIRE CONNECTION STATE CHECK NO IC601 NJW1190 TROUBLESHOOTING CONSULT 8 FUNCTION MODE HAS NO SOUND NJW1190 IC601 YES IC601 17 22PIN...

Page 24: ...G CONSULT YES NO IC601 17 22PIN OUTPUT SIGNAL CHECK AUX OUTPUT JK601 SIGNAL INPUT CHECK CD YES YES IC601 NJW1190 TROUBLESHOOTING CONSULT YES NO IC601 17 22PIN OUTPUT SIGNAL CHECK MAIN PCB PATTERN CHECK YES NO IC601 4 35PIN SIGNAL INPUT CHECK CD OUTPUT PN709 6 8PIN SIGNAL CHECK and CD TROUBLESHOOTING CONSULT ...

Page 25: ... 73 71 70 72 TU101 2PIN 9V VOLTAGE CHECK TU101 6 7 8 9PIN CHECK PLL CE PLL DI CLK PLL DO TU101 3 5 SIGNAL CHECK NO NO NO IC601 2 37PIN SIGNAL INPUT CHECK NO YES YES TUNER MODULE CHANGE MAIN PCB PATTERN CHECK IC601 17 22PIN OUTPUT SIGNAL CHECK NO IC601 NJW1190 TROUBLESHOOTING CONSULT ...

Page 26: ... YES IC402 6PIN 10 4V CHECK YES YES IC402 7PIN SIGNAL OUTPUT CHECK YES IC402 2PIN SIGNAL INPUT CHECK IC402 3PIN SIGNAL OUTPUT CHECK YES CHANGE IC408 BETWEEN DVD PCB IC408 AND CN307 PATTERN CHECK YES DVD PCB IC501 125 126PIN CHECK NO BETWEEN IC408 1PIN AND IC501 125 126 PATTERN CHECK YES DVD PCB IC407 OUTPUT 18 19 14 15PIN OUTPUT CHECK YES DVD PCB IC406 INPUT 5 6 2 3PIN CHECK YES DVD PCB IC406 OUTP...

Page 27: ...ING NO IC601 19 20 SDA SCA PULSE WAVE CHECK VOL UP DOWN TURN CHECK IC601 CHANGE NO FUNCTION INPUT PORT SIGNAL CHECK NJW1190 TROUBLESHOOTING YES SMPS VOLTAGE CHECK CONSULT YES NO IC601 24PIN VOLTAGE INPUT CHECK IC601 17 22PIN WAVE OUTPUT CHECK YES IC601 OK 9 IC601 NJW1190 TROUBLUSHOOTING ...

Page 28: ...ECK PROTECTION HIGH SMPS VOLTAGE AND AMP ON OFF STATE CHECK YES NO PN702 3PIN PROTECTION CHECK HIGH LOW SMPS TROUBLESHOOTING CONSULT YES NO IC701 3 20 5 18 EACH 65V 65V CHECK SMPS TROUBLESHOOTING CONSULT YES NO IC701 9 14 9V CHECK IC701 11PIN AMP ON OFF HIGH CHECK IC701 6 17 OUTPUT SIGNAL CHECK IC701 12PIN PROTECTION LOW CHECK IC701 10 13 INPUT SIGNAL CHECK YES OK 10 AMP MODULE TROUBLESHOOTING ...

Page 29: ...E 0 6V OVER CHECK L203 2 3PIN OCSILLATION CHECK NO NO NO IC201 7 24PIN INPUT CHECK NO YES Q204 CHANGE Q204 COLLECTOR LOW NO YES L203 CHANGE Q203 CHANGE NO YES YES OK IC502 4PIN STATE CHECK YES Q213 212 STATE CHECK INPUT LINE CHECK IC201 10 21PIN OUTPUT CHECK NO IF NO SIGNAL CHANGE THE IC IC201 IC601 EACH INPUT TUNER 2 37 TAPE 3 36 CD 4 35 AUX 5 34PIN SIGNAL INPUT CHECK NO REC INPUT CHECK ...

Page 30: ...OVER CHECK L203 2 3PIN OCSILLATION CHECK NO NO NO IC201 7 24PIN INPUT CHECK NO YES Q204 CHANGE Q204 COLLECTOR LOW NO YES L203 CHANGE Q203 CHANGE NO YES YES OK IC502 4PIN STATE CHECK YES Q213 212 STATE CHECK INPUT LINE CHECK IC201 10 21PIN OUTPUT CHECK NO IF NO SIGNAL CHANGE THE IC IC201 IC601 EACH INPUT TUNER 2 37 TAPE 3 36 CD 4 35 AUX 5 34PIN SIGNAL INPUT CHECK NO REC INPUT CHECK ...

Page 31: ...3 13 INTERNAL BLOCK DIAGRAM OF ICs 1 HA12237F BLOCK DIAGRAM ...

Page 32: ...3 14 2 NJW1190 BLOCK DIAGRAM 3 AF330W20FT 3 1 PIN CONFIGURATION ...

Page 33: ...3 15 3 2 BLOCK DIAGRAM 3 3 PIN DESCRIPTION ...

Page 34: ...3 16 4 AF350W01FT 4 1 PIN CONFIGURATION 4 2 BLOCK DIAGRAM ...

Page 35: ...3 17 4 3 PIN DESCRIPTION ...

Page 36: ...3 18 3 19 WIRING DIAGRAM ...

Page 37: ...3 20 3 21 BLOCK DIAGRAM ...

Page 38: ...RIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER 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 1 Shaded parts are critical for safety Replace only with specified part number 2 Volta...

Page 39: ...ONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER 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 IMPORTANT SAFETY ...

Page 40: ...3 26 3 27 3 AUDIO MAIN SCHEMATIC DIAGRAM ...

Page 41: ...3 28 3 29 4 DECK SCHEMATIC DIAGRAM ...

Page 42: ...3 30 3 31 5 USB AUX2 HEADPHONE AMP SCHEMATIC DIAGRAM ...

Page 43: ...3 32 3 33 6 I O JACK SCHEMATIC DIAGRAM ...

Page 44: ...3 34 3 35 7 AMP SCHEMATIC DIAGRAM ...

Page 45: ...3 36 3 37 8 WOOFER AMP SCHEMATIC DIAGRAM ...

Page 46: ...3 38 3 39 9 FRONT SCHEMATIC DIAGRAM ...

Page 47: ...3 40 3 41 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP VIEW ...

Page 48: ...3 42 3 43 MAIN P C BOARD BOTTOM VIEW ...

Page 49: ...3 44 3 45 2 SMPS POWER P C BOARD 3 SUB SMPS POWER P C BOARD ...

Page 50: ...3 46 3 47 4 FRONT P C BOARD TOP VIEW ...

Page 51: ...3 48 3 49 FRONT P C BOARD BOTTOM VIEW ...

Page 52: ...3 50 3 51 5 AMP P C BOARD TOP VIEW BOTTOM VIEW ...

Page 53: ...3 52 3 53 6 WOOFER AMP P C BOARD MEMO ...

Page 54: ... DISK1 APPEAR AT FLD DOES IT APPEAR DVD ERROR AT FLD PUSH KARAOKE DVD BUTTON MICOM IC302 CHANGE YES DOES AUX FM 87 5 APPEAR AT FLD YES CHECK CONNECTOR PN709 CHECK CONNECTOR P4703 P4004 CN709 CHECK AN AUDIO MICOM OR INTERFACE RECONNECT P4703 DOES NO DISC OR TIME ARE APPEARED AT FLD NO NO CHECK THE VOLTAGE OF EACH PIN ON CN709 NO NO NO NO YES OK RECONNECT IT ...

Page 55: ...DRAM WORKS PROPERLY CHECK THE RELATED CIRCUIT OF ES6698FD IC501 PIN133 134 137 138 139 140 NO YES ES8381 VIDEO OUTPUTS PROPERLY CHECK THE CABLE CONNECTION BETWEEN DVD PCB AND MD MECHA CHECK THE MD MECHA NO NO YES DOES FIRST TRAY MOVE INSIDE WHEN IT IS AT CLOSED POSITION OUT_SW IN_ SW SIGNALS OK CHECK THE OUTPUT SIGNAL OF ES8381 TO IC401 FOR CONTROL OPEN CLOSE NO YES OPEN CLOSE SIGNALS ON IC401 ARE...

Page 56: ...CHECK THE RELATED CIRCUIT OF SLED AND MOTOR DRIVER IC IC401 SLED SIGNAL IS OK NO B C CHECK THE CABLE CONNECTION WITH MECHA CHECK FOCUS CONNECTION ON ES8381 AND MOTOR DRIVER IC OPTICAL LENS IS MOVING FOR SEARCHING FOCUS PROPER FOCUS OUTPUTS TO MOTOR DRIVER NO NO YES YES YES CHECK THE MOTOR DRIVER IC401 PROPER F FOUTPUTS NO CHECK CABLE CONNECTION WITH PICK UP HEAD ...

Page 57: ...CUIT OF LASER POWER TRANSISTOR COLLECTOR VOLTAGE OF POWER TRANSISTOR IS OK Q405 Q406 NO YES YES C D CHECK CABLE CONNECTION BETWEEN PDM01 AND PICK UP HEAD CHECK THE SPINDLE RELATED CIRCUIT ON ES8381 DOES SPINDLE ROTATE PROPER SPINDLE SIGNAL ON ES8381 NO CHECK THE SPINDLE CONTROL OF MOTOR DRIVER IC404 SPIN SPIN OUTPUT PROPERLY NO NO YES YES YES CHECK THE CABLE CONNECTION BETWEEN PDM03 AND MD ...

Page 58: ... PROPER FOO SIGNAL ON IC401 NO NO YES YES YES D E CHECK CABLE CONNECTION BETWEEN PDM01 AND MD CHECK THE RELATED CIRCUIT BETWEEN IC401 AND ES8381 CHECK THE TRACKING CONTROL ON MOTOR DRIVER IC401 TRACKING OK DISC PLAY PROPER TRO SIGNAL ON IC401 NO T T OUTPUT PROPERLY NO NO NO YES YES YES YES CHECK CABLE CONNECTION ON PICK UP HEAD CHECK RF SIGNAL WAVEFORM ...

Page 59: ...UTS ARE OK DURING PLAYING DISK AUDIO SIGNAL DATA ON CN709 IS OK NO NO YES YES E CHECK THE MAIN PCB FOR EXAMPLE COMPOSITE VIDEO CHECK THE VIDEO MUTE TR Q411 OUTPUT OF VIDEO BUFFER IC IC407 AND ES8381 VIDEO SIGNAL DATA TEST END PICTURE SIGNAL DATA ON ES8381 IS OK NO NO ...

Page 60: ...CN709 NO CHECK THE HRST SIGNAL CHECK THE USB PART AND DVD PART LINE NO NO CHECK THE USB DATA LINE P4302 CHECK THE IC501 ES8381 CHECK USB DATA LINE PIN 122 123 OK YES SEARCHING OR USB DISPLAY CHECK NO YES CHECK THE USB JACK POWER SUPPLY CHECK P4302 READING OK CHECK NO ...

Page 61: ...4 8 WAVEFORMS 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 62: ...4 9 2 OPEN CLOSE WAVEFORM AT POWER ON 1 open 2 UP sw 3 DOWN sw 4 close 3 STARTING ACTION WAVEFORM IN MD DEVICE 1 Driver STBY 2 SLEGN 3 SL 4 SL At Power on ...

Page 63: ...4 10 4 FOCUS WAVEFORM AT CD 1 F 2 F NO DISK 5 FOCUS WAVEFORM AT DVD 1 Q401 DVD_LD 2 Q402 CD_LD INSERT CD ...

Page 64: ...4 11 6 AT POWER ON SPINDLE SIGNAL AT MD DECK 1 Spind 2 Spin 3 Spin 7 AT FIRST ACTION FOCUS SIGNAL A B C D 1 A 2 B 3 C 4 D ...

Page 65: ...4 12 8 TRACKING SIGNAL 1 Tro 2 Tr 3 Tr 9 RF WAVEFORM ...

Page 66: ...4 13 10 DISK TYPE JUGEMENT WAVEFORM 1 F 2 FDO 3 SVRRF DVD CD ...

Page 67: ...4 14 MEMO ...

Page 68: ...4 15 4 16 SCHEMATIC DIAGRAMS 1 MPEG SCHEMATIC DIAGRAM ...

Page 69: ...4 17 4 18 2 SERVO SCHEMATIC DIAGRAM ...

Page 70: ...4 19 4 20 3 USB SCHEMATIC DIAGRAM ...

Page 71: ...4 21 4 22 4 INTERFACE SCHEMATIC DIAGRAM ...

Page 72: ...4 23 4 24 DVD P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAM ...

Page 73: ...4 25 4 26 DVD P C BOARD BOTTOM VIEW ...