LG MDS64V Service Manual Download Page 21 | Manualshive

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3-6

9. POWER AMP PART CHECK

YES

Refer to SMPS troubleshooting

NO

P7905 pin3:+12V

pin13,14,15:32V

YES

Check each line resistor output voltage

NO

YES

Check each input

IC700 pin22,23,44:+12V

Replace the coil

NO

YES

Check output

line coil

POWER AMP PART CHECK

OK

YES

Check each IC700

pin27,26,32,35,40,41 input voltage

YES

Check PWM modulator input

each pin6,8,16,18

YES

POWER output IC700 pin28,31,36,39

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Summary of Contents for MDS64V

Page 1: ... 2009 DVD Mini Hi Fi System SERVICE MANUAL MODEL MDD64K MDS64V CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com Internal Use Only MODEL MDD64K MDS64V SERVICE MANUAL ...

Page 2: ...2 1 MECHANISM EXPLODED VIEW 2 3 SPEAKER EXPLODED VIEW 2 9 PACKING ACCESSORY VIEW 2 10 SECTION 3 ELECTRICAL PART TROUBLESHOOTING GUIDE AUDIO PART TROUBLESHOOTING GUIDE 3 1 DVD PART TROUBLESHOOTING GUIDE 3 10 WAVEFORMS OF MAJOR CHECK POINT 3 17 WIRING DIAGRAM 3 21 BLOCK DIAGRAMS 3 22 CIRCUIT DIAGRAMS 3 25 CIRCUIT VOLTAGE CHART 3 49 PRINTED CIRCUIT DIARGAMS 3 53 SECTION 4 REPLACEMENT PARTS LIST 4 1 C...

Page 3: ...ser 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 cleaning the lens surface the...

Page 4: ...ore replacing a component part first disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench 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 preve...

Page 5: ... 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 comparable conductive materials 7 Immediately be...

Page 6: ...e position and make changes with Rmc key Press STOP key FLD write ok Remote control 0 Front STOP push same timing FLD E2P CLR Completed NAME OPT 0 OPT 1 OPT 2 OPT 3 OPT 4 OPT 5 OPT 6 OPT 7 OPT 8 OPT 9 DETECT NEW EEPROM OPTION EDIT SCREEN HEX 19 0A A0 DD 00 19 83 20 10 00 SERVICE INFORMATION FOR EEPROM ...

Page 7: ... the following steps 1 When the USB device is inserted at the USB function the screen is changed into downloading screen 2 When downloading is completed the message Completed is displayed at the top left on the screen 3 Turn on the power press the SETUP button of the remote controller on the USB FUCTION When the SETUP window is displayed on the screen move down once to select the DISPLAY menu Go t...

Page 8: ... Frequency response audio 40 20 000 Hz Signal to noise ratio audio More than 75 dB 1 KHz Signal to noise ratio video More than 55 dB 1 KHz Dynamic range audio More than 80 dB Video output 1 0 V p p 75 Ω Component Video output Y 1 0 V p p 75 Ω Pb Pr 0 7 V p p 75 Ω Cassette tape player F F REW Time 120 sec C 60 Frequency Response 250 8000 Hz Signal to Noise Ratio 43 dB Channel Separation 50 dB P B 4...

Page 9: ...1 8 ...

Page 10: ... 263 270 271 272 273 268L 269L 269R 268R 262 253 276 253 257 A42 A43 CABLE5 464 464 451 CABLE6 CABLE7 464 464 464 A44 274 277 275 277 T 464 464 464 464 FRONT 293 464 CABLE8 266A 266B U 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 SECTION 2 EXPLODED VIEWS 2 1 2 2 1 CABINET ...

Page 11: ... 1 TAPE DECK MECHANISM A S A S RIGHT A S DECK BRASS MOTOR PULLEY MAYBE CHANGED FORWOW FLUTTERWHEN NECESSARY RING FW MAYBE ADDED FORWOW FLUTTERWHEN NECESSARY 001 002 006 007 008 016 017 018 019 020 003 A00 009 009 A02 A01 011 013 022 025 015 023 ...

Page 12: ...2 5 2 6 2 TAPE DECK MECHANISM A S A S LEFT A S DECK RING FW MAYBE ADDED FORWOW FLUTTERWHEN NECESSARY 013 011 009 009 003 008 015 022 023 024 016 017 018 019 020 007 A03 A00 ...

Page 13: ...151 155 159 170 163 162 177 172 167 166 175 180 137 012 012 A01 A02 012 430 164 173 165 153 156 153A 169A 169B 169C 035 430 430 010 181 A26 3 MECHANISM DECK EXPLODED VIEW DVM H1713 2 7 2 8 ...

Page 14: ...2 9 4 SPEAKER EXPLODED VIEW ᆞFRONT SPEAKER MDS64V 653 654 651 653 652 655 A60R A60L A61R A61L A62R A62L 656 ...

Page 15: ...G ACCESSORY VIEW 801 Instruction Ass y 808 Battery 824 AM Loop antenna 825 FM wire antenna 900 Remote Control 811 RCA Cable 1Pin Black 803 Packing 804 Bag 802 Caja 803 Packing 801S Song Book Micro Phone 827 Disc 832 ...

Page 16: ...ne Check short of P9701 P9702 line NO Check short of P9701 line NO Replace IC901 902 YES Check the DC V of C905 if DC V is over 400V NO YES Check the DC V of C909 C903 C921 If DC V is in 14 19V and it is steady Check IC901 902 YES YES Check the DC V of C981 C945 If DC V is 6 1V YES Check the DC V of C950 C951 If DC V is in 31 68V YES OK SECTION 3 ELECTRICAL PART ...

Page 17: ...K CHECK Check the pin3 of P9702 if DC V is over 28V YES OK OK OK NO Replace IC101 KIA7042 NO YES YES YES YES Check if IC101 of out put voltage is over 4 3V YES Check voltage of IC100 LC87Fxxx pin4 YES Refer to SMPS troubleshooting MICOM PART CHECK I NO Check P SENS P7904_pin6 NO Check both end voltage of IC101 KIA7042 Check If input voltage of IC101 is over 5V Check the periphery of IC101 KIA7042 ...

Page 18: ...4MHz Check the operation Check P SENS P7904_pin6 Check both end voltage of D101 Check If output of D101 is 5V YES Check D101 MICOM PART CHECK II NO Replace D101 YES OK YES OK 6 IC103 S24CS16A01 PART CHECK YES YES YES YES pin93 DATA pin94 CLK Check MICOM NO Check MICOM voltage 5V CHECK IC100 PIN93 94 NO Replace MICOM NO Refer to MICOM troubleshooting OK OK ...

Page 19: ...L 26 pin23 FL 22 pin22 VKK over 26V pin19 5 6V Check IC501 ET6315 voltage pin30 VKK 26V pin13 43 5V OK OK NO Replace IC501 NO If voltage is not 5V check input and output of L502 YES Check IC501 Check CN304 connection YES YES Check each pin voltage OK YES NO YES YES Check IC102 IC501 data communication 3pin 9pin STB 2pin 7pin DATA 4pin 8pin CLK OK NO Replace IC102 NO IC102 pin2 3 4 check data Input...

Page 20: ...24 25 26 DATA input PWM wave Check PWM modulator output FL pin75 74 FD pin71 70 check other output Check IC604 PS9830 VDD pin voltage 3 10 22 29 39 47 56 65 72 87 94 check X601 pin2 3 3V OK Replace X601 NO YES Check X601 12 288MHz OK Refer to DVD troubleshooting NO Check P7403 DVD assy communication Check each line resistor output NO Check IC604 PS9830 DATA input Replace R671 R670 R665 NO YES Chec...

Page 21: ... Check each line resistor output voltage NO YES Check each input IC700 pin22 23 44 12V Replace the coil NO YES Check output line coil POWER AMP PART CHECK OK YES Check each IC700 pin27 26 32 35 40 41 input voltage YES Check PWM modulator input each pin6 8 16 18 YES POWER output IC700 pin28 31 36 39 ...

Page 22: ...ck P7501 pin6 L CH pin8 D CH Check IC801 MC4580 pin4 12V pin8 12V Check IC201 pin6 12V pin7 3 3V Refer to SMPS troubleshooting Check P201 connection Check IC501 ES8390 pin55 input data Check IC501 ES8390 output data Check CN202 pin4 5 5V pin11 12 3 3V Check IC201 pin13 RST pin11 MCLK pin9 YES YES YES YES YES YES YES YES YES YES YES YES NO NO Check IC200 BU4052 pin7 12V pin16 12V Each function outp...

Page 23: ...head input IC201_pin34 37 Check IC201 HA12237 _pin16 12V input YES Check IC201_ pin5 26 output signal YES Check IC201 pin14 mute operation YES Check IC201 Check A B DECK head input TAPE PLAY PART CHECK NO Replace head wire and tape DECK mechanism NO Replace IC201 YES OK YES OK NO Check IC202_pin10 HIGH YES Check IC202 NO Replace IC202 YES OK ...

Page 24: ... Check IC201_ pin10 21 output Check IC100_ pin23 HIGH TAPE REC PART CHECK NO Replace IC201 Replace IC202 YES OK NO Check L203_pin2 3 oscillation Check Q205 D1304 _ base HIGH NO Check IC202_pin4 HIGH YES OK OK YES YES YES YES YES Check IC201_pin7 24 record input YES Check P2203_pin5 3 input and pin8 erase input YES ...

Page 25: ...201 YES Check DVD MD module YES POWER ON Does DVD CD appear at FLD YES YES Does no disc or time are appeared at FLD YES Check connector P7501 Check the voltage of each pin on P201 Does it appear DVD error at FLD Does AUX FM 87 5 AM USB appear at FLD Func Check connector P400 OK DVD ELECTRICAL TROUBLESHOOTING GUIDE POWER ON ...

Page 26: ...M works properly Check the related circuit of ES8390 IC501 pin133 134 137 138 139 140 NO YES ES8390 VIDEO outputs properly NO Check the MD mecha NO Check the cable connection between DVD PCB and MD MECHA Does tray move inside when it is closed position YES YES OPEN_SW CLOSE_ SW Signals on P406 are ok Check the output signal of ES8390 to IC401 for control OPEN CLOSE NO YES OPEN CLOSE signals on IC4...

Page 27: ...inner side when it is at outer position YES YES YES SLED signal is OK Check the MD NO YES Motor Driver DRV_MMUTE pin 3 High A NO Check Focus connection on ES8390 and motor driver IC NO Check cable connection with pick up head Optical lens is moving for searching focus YES YES Proper Focus outputs to motor driver Check the motor driver IC401 NO YES Proper F F outputs B ...

Page 28: ...CDLD output properly Check the related circuit of laser power transistor NO YES Collector voltage of power transistor is ok Q405 Q406 Put disc in tray B NO Check the SPINDLE related circuit on ES8390 NO Check the cable connection between P400 and MD Does SPINDLE rotate YES YES YES Proper SPINDLE signal on ES8390 Check the SPINDLE control of motor driver IC401 NO SPIN SPIN output properly C Laser o...

Page 29: ... C D from MD Check the related circuit of ES8390 FOCUS signal NO YES Proper FOD signal on IC401 NO Check the related circuit between IC401 and ES8390 NO Check cable connection on pick up head Tracking ok YES YES YES Proper TRD signal on IC401 Check the tracking control on motor driver IC401 NO T T output properly Check RF signal waveform NO Disc play C D ...

Page 30: ... and CN201 NO YES Check the MAIN PCB All outputs are ok during playing disk YES YES Audio signal data on ES8390 is ok For example composite video Check the video mute TR Q507 ES8390 video signal data NO Picture signal data on ES8390 is ok D TEST END ...

Page 31: ...201 NO Check the HRST signal Check Searching or USB Display YES YES Check the USB and DVD part YES Check the USB part supply CN205 NO Check the USB data line CN205 Check Reading OK YES YES Check the ES8390 Check DATA LINE pin98_USB_NO 99_PO YES TURN ON USB OK ...

Page 32: ... 17 1 WHEN POWER ON RESET DATA ETC WAVEFORM WAVEFORMS OF MAJOR CHECK POINT SPI DI SPI DO TX LCS3 FLASH 1 2 3 4 IC501 pin 72 IC501 pin 46 IC501 pin 47 IC503 pin 1 HRST 5V D D 5 6 IC501 pin 91 IC501 pin 90 ...

Page 33: ... 3 STARTING ACTION WAVEFORM IN MD DEVICE 4 FOCUS WAVEFORM AT CD SL Driver STBY SLEGN SL 11 12 IC401 pin 18 IC401 pin 17 F F 13 14 IC401 pin 3 IC401 pin 4 open UP sw DOWN sw close 7 8 9 10 IC401 pin 11 IC501 pin 63 IC501 pin 59 IC401 pin 10 ...

Page 34: ...D 6 AT POWER ON SPINDLE SIGNAL AT MD DECK 7 TRACKING SIGNAL Q405 DVD_LD Q406 CD_LD 15 16 Q405 Q406 Sclavijad Sclavija Sclavija 17 18 19 IC401 pin 21 IC401 pin 15 IC401 pin 16 Tro Tr Tr 20 21 22 IC401 pin 7 P400 pin 16 P400 pin 17 ...

Page 35: ...3 20 9 DISK TYPE JUGEMENT WAVEFORM 8 RF WAVEFORM DVD F FDO SVRRF 23 24 25 P400 pin 18 IC401 pin 6 IC401 pin 23 CD F FDO SVRRF 26 27 28 P400 pin 18 IC401 pin 6 IC401 pin 23 ...

Page 36: ...GRAM 13P 23P 11P 5P 2CH AUX JACK TUNER MODULE 3CD CHANGER MD MAIN PCB DOUBLE DECK MECHANISM 18P 3P 36P FRONT PCB SMPS PCB 15P 8P 6P 10P 10P R PB PR CO MPONENT DVD PCB 12P 6P 8P POWER KEY PHONE B to B 8P B to B 10P MIC ...

Page 37: ...F5N C8A AUDIO MICOM AMP_PRT SD PDN PWM_RST DATA CLK S 24CS16A01 EEPROM EEPROM DATA CLK DVD_RST CS CLK DI DO 5345_RST CLK DATA TUNER DECK A DECK B HA12237F Cassette Deck ASP BU2090 EXPANDER DECK S W AUX BU4052 AUDIO S W SCLK SDIO SEN RST GAIO2 MAIN AUDIO IN 4052_A B TUNER AUX IN L R L R ERASE REC L R MIC S4308 MIC USB H P D D MIC SIG FLT DISPLAY PT6302 FLT DRIVER VFD_STB DO CLK TAPE_A B HALL_A B LE...

Page 38: ...US SLED SPINDLE TRACKING AMP_STBY SLED F T LOAD SPINDLE M DECK MECHANISM MOTOR DRIVE IC IP9011 MICOM I F SCI SDA DMA 0 11 DB 0 15 DSCK CKE CS0 RAS0 SPI_CS CLK DI KO PWM I F CE CLK DI DO MRST LRCK BCK ADATA 0 3 USBP USBN Aux IN TUNER CS5345 POWER I F 3 8V 12V 3 3V REG 3 3V 5V USB CON Component Composite Y G Pb B Pr R Composite MCLK BCK LRCK DATA MIC I F FRONT PTB TAPE ...

Page 39: ...3 24 ...

Page 40: ... ORIGINAL DESIGN BE MODIFIED OR ALTERED WITH OUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS 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 CHANG...

Page 41: ...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 MPEG EBY57026801_ 1 REV4 1 2009 03 13 1 8 9 2 3 4 5 6 WAVEFORM 2 MPEG CIRCUIT DIAGRAM 3 27 3 28 ...

Page 42: ... 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 SERVO EBY57026801_ 2 REV4 1 2009 03 13 11 17 25 28 12 18 19 13 14 23 26 24 27 22 21 15 16 20 7 10 WAVEFORM 3 30 3 SERVO CIRCUIT DIAGRAM 3 29 ...

Page 43: ...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 I O EBY57026801_ 3 REV4 1 2009 03 13 3 31 3 32 4 I O CIRCUIT DIAGRAM ...

Page 44: ...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 MICOM INTERFACE EBY59807101_ 1 REV7 1 2009 03 13 3 33 3 34 5 MICOM INTERFACE CIRCUIT DIAGRAM ...

Page 45: ...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 PWM EBY59807101_ 2 REV7 1 2009 03 13 3 35 3 36 6 PWM CIRCUIT DIAGRAM ...

Page 46: ...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 AMP EBY59807101_ 3 REV7 1 2009 03 13 3 37 3 38 7 AMP CIRCUIT DIAGRAM ...

Page 47: ...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 DECK EBY59807101_ 4 REV7 1 2009 03 13 3 39 3 40 8 DECK CIRCUIT DIAGRAM ...

Page 48: ...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 EBY60660201 REV4 4 2009 03 10 9 FRONT CIRCUIT DIAGRAM 3 41 3 42 ...

Page 49: ...10 HEADPHONE CIRCUIT DIAGRAM 3 43 3 44 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 HEADPHONE EBY60660301 REV5 1 2009 03 10 ...

Page 50: ...11 MIC CIRCUIT DIAGRAM 3 45 3 46 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 MIC EBY60660401 REV5 1 2009 03 10 ...

Page 51: ...12 KEY CIRCUIT DIAGRAM 3 47 3 48 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 KEY EBY60660501 REV2 2 2009 03 10 ...

Page 52: ... EE Mode V IC 200 BU4052 1 0 01 2 0 01 3 0 01 4 0 01 5 0 01 6 0 01 7 6 29 8 0 01 9 0 01 10 0 01 11 0 01 12 0 01 13 0 01 14 0 01 15 0 01 16 5 96 IC801 MC4580 1 0 06 2 0 04 3 0 04 4 12 23 5 0 04 6 0 06 7 0 06 8 11 58 IC802 MC4580 1 0 01 2 0 01 3 0 03 4 11 28 5 0 03 6 0 02 7 0 01 8 11 26 IC103 M24C16 1 0 01 2 0 01 3 0 01 4 0 01 31 1 11 32 3 35 33 1 17 34 0 42 35 0 29 36 3 35 37 0 02 38 1 5 39 0 04 40...

Page 53: ... 16 25 0 26 1 23 27 2 21 28 1 56 IC502 SDRAM 1 3 39 2 0 6 3 3 39 4 0 71 PIN NO PB Mode V 5 0 71 6 0 7 0 91 8 0 71 9 3 38 10 0 86 11 0 94 12 0 13 0 92 14 3 38 15 0 02 16 0 17 3 3 18 3 2 19 3 26 20 0 09 21 0 03 22 0 09 23 0 09 24 0 55 25 0 56 26 1 6 27 3 38 28 0 01 29 1 38 30 1 53 31 1 79 32 1 38 33 2 62 34 0 35 0 02 36 0 02 37 3 38 38 1 45 39 0 02 40 0 41 0 01 42 0 83 43 3 38 44 0 89 45 0 77 46 0 0...

Page 54: ...3 53 3 54 PRINTED CIRCUIT BOARD DIARGAMS 1 1 MAIN P C BOARD DIAGRAM TOP VIEW ...

Page 55: ...1 2 MAIN P C BOARD DIAGRAM BOTTOM VIEW 3 55 3 56 ...

Page 56: ...3 57 3 58 2 1 DVD P C BOARD DIAGRAM TOP VIEW ...

Page 57: ...2 2 DVD P C BOARD DIAGRAM BOTTOM VIEW 3 59 3 60 ...

Page 58: ...3 61 3 62 3 SMPS P C BOARD DIAGRAM NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 59: ...3 63 3 64 4 FRONT P C BOARD DIAGRAM 6 KEY P C BOARD DIAGRAM OPTIONAL PART 5 HEADPHONE P C BOARD DIAGRAM 7 MIC P C BOARD DIAGRAM ...

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