LG MCS903AW Service Manual Download Page 25

Page: 25 / 83

3-4

Only for training and service purposes

LGE Internal Use Only

4. FLD DISPLAY PART CHECK

YES

Refer to SMPS

Troubleshooting

Replace the related part

Check CN710

assembly

Check

10 PIN

→

- 27V

11 PIN

→

20V

12 PIN

→

25V

YES

FLT turned on

Check the power of CN710

10 11 12 PIN

YES

Check the

connecting condition

and the power of P3702

40PIN: FL- 20

39PIN: FL+ 25

38PIN: VKK-28vor higher

39PIN: 5.6V

YES

Check

IC304 PT6324

power 50 PIN VKK:-28V

9.52 PIN +5V

YES

Check each pin

Check IC100

→

IC301 DATA communication

27 PIN

→

3PIN STB

26 PIN

→

2PIN D

28 PIN

→

PIN CLK

Replace the related part.

If 5V is failed, check the input and

output power of D319 1SR35

IC100

IC303

27 PIN

→

3PIN STB

28 PIN

→

1PIN CLK

Check Data output

Check the data at both terminals

of LINE R330,331,332

YES

Check the related part

YES

Check the related part

YES

FLD DISPLAY CHECK

Summary of Contents for MCS903AW

Page 1: ...903W MCS903AW SERVICE MANUAL MINI Hi Fi SYSTEM SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL MCV903 MCS903F MCS903S MCS903W MCS903AW Website http biz lgservice com Internal Use Only ...

Page 2: ...SM EXPLODED VIEW 2 3 CD MECHANISM EXPLODED VIEW 2 7 SPEAKER EXPLODED VIEW 2 9 PACKING ACCESSORY VIEW 2 13 SECTION 3 AUDIO ELECTRICAL PART AUDIO ELECTICAL TROUBLESHOOTING GUIDE 3 1 INTERNAL BLOCK DIAGRAM OF ICs 3 17 WIRING DIAGRAM 3 29 BLOCK DIAGRAMS 3 31 SCHEMATIC DIAGRAMS 3 35 PRINTED CIRCUIT DIAGRAMS 3 59 SECTION 4 CD ELECTRICAL PART CD ELECTICAL TROUBLESHOOTING GUIDE 4 1 WAVEFORMS OF MAJOR CHEC...

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: ...d 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 ...

Page 6: ...esired CD TIME Power on off CLOCK To select TUNER FM or AM fuction eXtreme Dynamic Sound System Look for radio stations automatically DEMO VOCAL FADE PORTABLE IN PHONES SET OPEN CLOSE Record from tape to tape Disc tray Skip to another track NATURAL EQ MIC VOL Starts playback Stops playback or recording Look for radio stations automatically Starts or pauses recording PORTABLE MIC 1 MIC 2 ...

Page 7: ...o Listen to your tracks in any order see Listening to the CDs Choose a desired CD see Listening to CDs Selecting the sound system You can enjoy different sounds by selecting the sound mode you want Press LINK repeatedly the display changes in the following order LINK ON SURROUND 1 SURROUND 2 VSM Virtual Sound Matrix You can select the Virtual sound Temporarily stop the sound Press the button again...

Page 8: ... to noise ratio 75dB CD player Frequency response 42 20000 Hz Signal to noise ratio 75 dB Dynamic range 80dB Cassette tape player F F REW Time 120 sec C 60 Frequency Response 250 8000 Hz Signal to Noise Ratio 43 dB Channel Separation 45 dB P B 45 dB R P Erase Ratio 50 dB MTT 5511 Speakers MCS903S MCS903F MCS903AW MCS903W Type Bass Reflex 2Way 2 Speaker Bass Reflex 2Way 2 Speaker Bass Reflex 1 Way ...

Page 9: ... must save the file to the USB storage device and disable the security software then download the file to your set Caution When downloading the file you should neither unplug the USB device change to the other function nor power off the device USB device must be unplugged when the downloading process is completed ON VFD DISPLAY SCREEN NO USB 1 INSERT USB DEVICE AT USB FUNCTION 2 WHEN COMPLETED REM...

Page 10: ... save the file to the USB storage device and disable the security software then download the file to your set Caution When downloading the file you should neither unplug the USB device change to the other function nor power off the device USB device must be unplugged when the downloading process is completed ON VFD DISPLAY SCREEN NO USB 1 INSERT USB DEVICE AT USB FUNCTION 2 WHEN COMPLETED REMOVE U...

Page 12: ...70 A43 CABLE3 CABLE1 CABLE2 A00 451 289 451 277 281 451 282 A52 285 451 451 451 305 451 278 A47 A46 451 283 301 283 453 451 453 302 451 A51 A56 A41 275 A26 280 451 288 265 274 FRONT K CABLE4 H 2 1 2 2 1 CABINET AND MAIN FRAME SECTION SECTION 2 EXPLODED VIEWS NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INF...

Page 13: ...FORWOW FLUTTERWHEN NECESSARY RING FW MAYBE ADDED FORWOW FLUTTERWHEN NECESSARY RING FW MAYBE ADDED FORWOW FLUTTERWHEN NECESSARY 2 3 2 4 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only TAPE DECK MECHANISM EXPLODED VIEW 1 TAPE DECK MECHANISM A R A S RIGHT A R DECK ...

Page 14: ... A00 RING FW MAYBEADDED FOR WOW FLUTTER WHEN NECESSARY 013 011 009 009 003 008 015 022 023 024 016 017 018 019 020 007 A03 2 5 2 6 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 15: ...164 417 166 417 167 416 177 172 175 162 168 163 440 173 153 417 418 155 419 170 441 188 189 190 418 181 A30 A35 421 186 185 417 421 184 187 2 7 2 8 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 16: ...ectronics Inc All right reserved Only for training and service purposes LGE Internal Use Only FRONT SPEAKER MCS903F SPEAKER EXPLODED VIEW 856 855 859 860 860 854 851 850 852 853 A80A A80R A80L A80BR A80BL WIRE80 WIRE81 858 857 ...

Page 17: ...right 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only REAR SPEAKER MCS903S 656 655 657 658 658 WIRE60 WIRE61 654 651 650 A60A A60R A60R A60BR A60BL 652 653 ...

Page 18: ...2 11 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only PASSIVE SUBWOOFER MCS903W 952 953 950 A90 951 958 958 956 956 957 A90B A90A 954 955 ...

Page 19: ...ht 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only PASSIVE SUBWOOFER MCS903AW 759 758 760 762 762 752 753 751 754 755 750 A70 A70A 761 A70B WIRE70 757 756 757 ...

Page 20: ...rposes LGE Internal Use Only 808 Battery Remote Control 824 ANTENNA LOOP 825 ANTENNA 900 Bag Packing 804 803 Instruction Ass y 801 Box 802 Plug Ass y 1Way 811 Plug Ass y 2Way Yellow 812 832 DISC Packing 803 806 Cable Coaxial 826 Microphone 830 AC Adaptor OPTIONAL PARTS PACKING ACCESSORY VIEW ...

Page 22: ...NO Replace the related part Is IC101 KIA7042 output 4 3V YES YES YES YES YES YES Check the IC100 87F5NC8A 4 PIN power YES Refer to SMPS Troubleshooting MICOM PART HECK I Check CN710 7PIN P SENS NO Is IC101 KIA7042 5V Is IC101 KIA7042 input 5V Check the related part of IC101 KIA7042 AUDIO ELECTRICAL TROUBLESHOOTING GUIDE SECTION 3 AUDIO ELECTRICAL PART ...

Page 23: ... YES YES YES OK Check R1A9 680 Ω Replace the related parts Check CN710 6PIN 5 6V Check the power of both D102 and D101 1SR35 Is the power of IC 100 14 40 55 89 4 8V YES NO Check IC102 KIA7031 input power Check the related part MICOM PART CHECK II NO NO Replace the related parts Check the D101 1SR35 output 5V NO NO Check replace the related part Check IC 102 KIA7031 output power NO Check the operat...

Page 24: ...aining and service purposes LGE Internal Use Only 3 MICOM PART CHECK III YES YES YES Refer to MICOM Par I II Troubleshooting Check the operation status of X101 32 768KHz and X100 9 8304MHz MICOM PART CHECK III Check the IC100 14 40 56 89 input power 4 8V or higher OK NO ...

Page 25: ...power of P3702 40PIN FL 20 39PIN FL 25 38PIN VKK 28vor higher 39PIN 5 6V YES Check IC304 PT6324 power 50 PINVKK 28V 9 52 PIN 5V YES YES Check each pin Check IC100 IC301 DATA communication PIN PIN 27 PIN 3PIN STB 26 PIN 2PIN D 28 PIN PIN CLK OK OK OK NO Replace the related part NO Replace the related part NO NO NO If 5V is failed check the input and output power of D319 1SR35 IC100 IC303 27 PIN 3PI...

Page 26: ...rnal Use Only 5 IC103 S 24CS16A01 J8T1GE CHECK YES YES YES YES 81 PIN DATA 82 PIN CLK Check the related part NO Check MICOM power 5V CHECK IC100 LC87F5NC8A 81 82 NO Replace the related parts NO Refer to micom troubleshooting NO Check the communication between both terminals of R189 190 100Ω OK OK CLK DATA ...

Page 27: ...Replace the related part NO Refer to SMPS Troubleshooting Check the M COM IC301 83PIN 84PIN communication Check the input waveform of IC200 BU4052 4 11PIN Check the output waveform of IC200 BU4052 3 13PIN NO YES Check the input waveform of IC801 MC4580 2 6PIN Check the IC801 MC4580 4PIN VSS 8PIN VDD power YES YES YES Replace the related part YES Check the output waveform of the PN709 6 PIN L_ CH 8...

Page 28: ...theTUNER module TU601 operation YES NO Check the IC200 BU4052 16PINVDD 8PIN VSS power TUNER FUNCTION PART CHECK Check the input waveform of IC200 BU4052 1 12PIN Check the input waveform of IC801 YES Replace the related part NO Check the IC801 MC4580 4PIN VSS 8PIN VDD power YES YES Replace the related part Check the output waveform of IC200 BU4052 3 13PIN Check the input waveform of IC601 BU4052 2 ...

Page 29: ...wer Check the input waveform of IC200 BU4052 2 15PIN YES NO Check the IC200 BU4052 16PINVDD 8PIN VSS power TAPE PCB ASS Y Check the output waveform of the PN709 6 PIN L_ CH 8 PIN R_ CH YES Replace the related part YES YES Replace the related part OK YES Check the output waveform of IC200 BU4052 3 13PIN Check the input waveform of IC601 BU4052 2 15PIN Check the input waveform of IC801 MIC4580 2 6PI...

Page 30: ...ace the related part Refer to SMPS Troubleshooting Replace HEAD WIRE and Mecha Check the IC201 5 26 PIN Signal Output NO NO Check the IC201 14 PIN MUTE operation Check the IC202 10 PIN HIGH operation YES Check A DECK HEAD input IC201 32 39PIN OK OK OK TAPE PLAY PART Check the related part YES YES Check the A B DECK HEAD YES Check the IC201 HA12237 16 PIN 12V input YES Check the related part YES ...

Page 31: ... the IC201 7 24 PIN REC input Replace the related part Replace the related part Check the IC201 10 21 PIN output NO Check P2203 5 3 PIN input Check 8 PIN ERASE input OK OK TAPE REC PART Check IC100 23PIN HIGH YES YES NO NO Check the IC202 4 PIN HIGH operation OK Check Q205 D1304 BASE HIGH YES YES Check the IC604 PS9829 49 52 PWM output YES YES YES YES Check the L203 2 3 PIN oscillation ...

Page 32: ...Apply JK302 JK303 and check CN301 2PIN 4PIN output Check the P312 2PIN 4PIN input Check the IC304 BA3308 8 PIN input Check the P306 15PIN output FRONT PCB Ass y Check the P7302 15PIN input MAIN PCB Ass y Check the input at both terminals of R804 812 YES Check the IC603 1 2PIN input MIC PART Check the IC304 BA3308 3PIN output NO Check IC304 6PIN 12V YES YES YES YES YES YES YES YES YES ...

Page 33: ...he related part Check each communication line resistance Refer to PS9830 Troubleshooting NO NO IC100 38PIN IC603 Check the REST operation Check the power at both terminals of FB803 YES YES YES YES YES NO Check the PS9830 input Check CN701 9PIN 5V YES OK YES YES OK OK 13 PWM MODULATION PART CHECK I PWM MODULATION PART CHECK I Refer to SMPS Troubleshooting Check CN701 9PIN 5V YES Check IC505 input 5...

Page 34: ...PIN 12 288MHz CLK input Check the IC604 87 86 PIN power 1 6V operation YES Check X601 12 288MHz Check IC505 output power 3 3V IC505 POWER CONT HIGH NO Replace the related part NO Replace the related part NO NO Check IC100 83 PIN POWER CONT HIGH NO NO NO YES YES OK OK YES YES YES OK YES OK Check the IC505 output power YES YES YES IC100 87F5NC8A 79 PWM_CLK 80 PWM_DATA 3 PWM_REST Check the output RES...

Page 35: ...art NO Checkthe assemblyandcontact oftheCDAss yand MAINAss y communication FFCWIRE NO YES OK See the CD Ass y Troubleshooting YES NO IC604 PS9830 19PIN_BCK R653 100Ω 20PIN_LRCK R654 100Ω 23PIN_SS0IND R655 100Ω Checkthewaveform atbothtil NO YES OK Replace the related part IC604 PS9830 19PIN_BCK20PIN_LRCK 23PINSS0INDinput 20PIN_LRCK 23PIN_SS0INDinput waveformcheck YES Checkthe CDAss ycommunica tionc...

Page 36: ...the related part Check the R554 553 552 output Check DA A_MUET R539 LOW and SW MUTE R540 LOW operation Replace the related part NO Replace the See the SMPS Ass y NO Check the PWM MODULATOR output FL 75 74 FR 59 58 SW 68 67 YES YES NO FL C533 FL C516 FR C535 FR C560 SW C555 SW C556 YES NO Check the operation condition of IC502 504 NO FRONT R530 518 529 532 SW Checktheoutput waveformatboth terminals...

Page 37: ...ed part Check the output waveform at both terminals of HP R854 855 865 864 YES YES YES NO OK YES OK YES OK Check HP SENS HIGH YES Check the operation condition of IC802 Check R857 861 Check the power at both terminals of R859 860 Check the IC802 12V input power FL C859 FL C860 FR C852 FR 853 YES Check the PWM MODULATOR output HP L40 41 HP R45 46 YES OK Check Q803 BASE LOWE P7302 18PIN 16PIN Check ...

Page 38: ...CN704 1 2 PIN 65 7 8PIN 65 operation YES YES Replace the SMPS Troubleshooting NO Check the power at both terminals of R744 757 65 Check the power at both terminals of R769 719 65 YES Check the power at both terminals of the said part NO Check the CN704 9PIN 9V 10PIN 9V power YES YES Replace the SMPS Troubleshooting NO Check the power at both terminals of L754 9V L753 9V YES Check the power at both...

Page 39: ...ECION LOW and HIGH LOW normal operation HIGH PROTECION Replace the related part YES YES YES IC701 Check 9PIN 9V 14PIN 9V IC701 1 6PIN R CH 17 22PIN L CH output waveform CN702 12 PIN LOW OFF HIGH ON YES YES NO Check the output LINE COIL YES NO Replace the AMP module and the said part YES Check the normal operation condition of each power OK OK ...

Page 40: ...3 19 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only INTERNAL BLOCK DIAGRAM OF ICs 2 BU4052 BIOCK DIAGRAM 1 AK5358 BIOCK DIAGRAM ...

Page 43: ...3 22 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 6 MLC3895_DSP PIN CONFIGURATION 7 IP9010_MOTOR IC BIOCK DIAGRAM ...

Page 44: ...3 23 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 8 BU9543KV_MOTOR IC PIN CONFIGURATION 9 S 24CS16A01_EEPROM IC BIOCK DIAGRAM ...

Page 47: ...3 26 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 12 A12237_DECK IC BIOCK DIAGRAM 13 DF350W01FH_WOOFER AMP IC BIOCK DIAGRAM ...

Page 50: ...4P 15P 15P 15P 12P 12P MAIN AMP PCB SUB AMP PCB Bíd to Bíd Bíd to Bíd Bíd to Bíd Bíd to Bíd 8P 13P 40P USB MIC H P FRONT PCB Portable DOUBLE DECK MECHANISM CD_KEY LED_L LED_R 8P 13P 3P 2P 12P Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 51: ... MAIN AUDIO IN 4052_A B TUNER PORTABLE IN AUX L R L R ERASE REC L R MIC BA3308 OPAMP ALC USB H P D D MIC SIG VFD PT6324 FLT DRIVER VFD_STB DO CLK HALL_A B LEAF_A B REC_MUTE PB_MUTE TAPE_A B SOL_A B MOTOR REC_BIAS TAPE REC_L R H P_L R BU9543KV RF SERVO DSP 74HC4094 EXPANDER MUTE TUR OP CL RESET MD SWITCH RESET IIC R W BUSY DATA SUBQ IIS CLK 74LC157 MUX IIS IIS IIS AK5358 AK5358 350W Power Amp FL FR...

Page 52: ...CK TUNER TUNER AMP POTABLE IN POTABLE IN DECK DECK SLED F T SPINDLE LOAD TDO SPDO FDO MD SWITCH 12MHZ 16 93MHZ FM AM MLC3890 MCS LOGIC MLC3890 MCS LOGIC RESET POWER I F 5V 12V PWM I2S SWITCH 4052 SWITCH 4052 OPAMP OPAMP L R L R L R L R DATA Address LINE MICOM BLOCK 3 3V I2S_MCK IPOD_DET IPOD_READY IPOD_TX IPOD CON1 IPOD CON2 L R Copyright 2008 LG Electronics Inc All right reserved Only for trainin...

Page 53: ... NO CIR CUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTI CAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF FER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND...

Page 54: ...UMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTI CAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF FER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMA...

Page 55: ...3 MICOM SCHEMATIC DIAGRAM 2008 01 25 1 2 3 4 5 6 7 8 9 10 11 12 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 39 3 40 ...

Page 56: ...LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 41 3 42 4 INTERFACE SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 57: ...08 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 43 3 44 5 DECK SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 58: ... LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 45 3 46 6 MAIN AMP SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 59: ...LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 47 3 48 7 WOOFER AMP SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 60: ...8 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 49 3 50 8 FRONT SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 61: ...8 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 51 3 52 9 LED_L SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 62: ...8 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 53 3 54 10 LED_R SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 63: ... LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 55 3 56 11 CD KEY SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 64: ...LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 57 3 58 12 MIC HP PT SCHEMATIC DIAGRAM 2008 01 25 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 ...

Page 65: ... right reserved Only for training and service purposes LGE Internal Use Only 3 59 3 60 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD DIAGRAM NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 71: ...pyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 71 3 72 5 1 LED L P C BOARD DIAGRAM 5 2 LED R P C BOARD DIAGRAM 6 CD KEY P C BOARD DIAGRAM ...

Page 72: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 73 3 74 7 MIC HP PT P C BOARD DIAGRAM 8 WOOFER AMP P C BOARD DIAGRAM ...

Page 74: ...acking Sled sig nal is OK NO NO NO NO Check Motor Drive IC IC807 NO Is Load OK Is Motor OK about 12 ohms NO NO OPU driving Focus and Tracking is OK Is can t see the signal at Pin 34 35 36 of IC807 NO Check Vcc of IC807 Is can t see the signal 16 O344MHz at Pin 31 of IC807 NO Check Cristal X802 Check IC801 input output and control line NO Replace IC801 NO Replace Cristal X802 Is no signal at SPK Re...

Page 75: ...Use Only 2 USB PART CHECK NO NO CHECK CN603 Plug in USB Device YES Display READ YES Display NO FILE YES YES YES Display NO USB YES Check USB_ 5V NO CHECK USB JACK JK303 YES Check USB_ D D R863 R865 NO Replace IC801 Check IC801 PIN 116 117 USB FUNCTION CHECK USB AUDIO FILE IN USB DEVICE MP3 WMA FILE IS PLAYABLE ...

Page 76: ...purposes LGE Internal Use Only WAVEFORMS OF MAJOR CHECK POINT 1 FLASH SDRAM CLK DATA ADDRESS RESET FE TE FOD RF 2 SERVO FLASH SDRAM IC802 PIN 8 21 35 IC803 PIN12 IC807 PIN30 CD 16M SERVOWAVEFORMS FE TE FOD RF BCK LRCK DATA 3 AUDIO PATH CD_ I2S IC807 PIN34 35 36 MUX_ I2S IC801 PIN88 99 100 ...

Page 77: ...ng and service purposes LGE Internal Use Only MCK BCK LRCK DATA AUDIO_L AUDIO_R 3 AUDIO PATH DAC_ I2S IC807 PIN38 39 40 41 AUDIO_ L R CE CLK DI DO 4 TUNER USB_5V D D MCK LRCK BCK DATA 5 USB 6 ADC USB D D CN803 PIN2 3 4 ADC I2S IC805 PIN11 12 10 9 TUNER SPI TUN800 PIN5 7 8 9 ...

Page 78: ...C DIAGRAM 2008 01 25 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 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only CD SCHEMATIC DIAGRAMS ...

Page 79: ...SERVO SCHEMATIC DIAGRAM Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2008 01 25 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 ...

Page 80: ...ADC SCHEMATIC DIAGRAM Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2008 01 25 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 ...

Page 81: ...Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 4 11 4 12 PRINTED CIRCUIT BOARD DIAGRAMS 1 1 CD P C BOARD DIAGRAM TOP VIEW ...

Search results

Summary of Contents for MCS903AW

Reviews:

LG MCS903AW, Service Manual, Page: 25 / 83

Search results

Summary of Contents for MCS903AW

Reviews: