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3-7

Power AMP part check

YES

Check each LINE registor output voltage.

IC700 : R701, 702, 726, 727

NO

Check each

IC700, 701, 702, 703

PIN1,17, 18, 19, 36 +12V

input.

Refer to SMPS troubleshooting.

YES

YES

YES

NO

P7905_3PIN : +12V,

PIN13, 14, 15 : 35V.

YES

Replace the coils

YES

NO

Check output line coil.

Check PWM modulator input.

Each IC PIN4, 6, 14, 16

YES

Power IC700, 701, 702, 703

PIN20, 27, 29, 34 output.

Check each IC700, 701, 702, 703

PIN21, 26, 29, 34 input voltage.

OK

9. POWER AMP PART CHECK

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Summary of Contents for MDD262

Page 1: ...HOME THEATER SERVICE MANUAL MODEL MDD262 MDS262V CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL MDD262 MDS262V SERVICE MANUAL P NO AFN32840846 FEBRUARY 2007 http biz lgservice com ...

Page 2: ...S6838 3 13 2 HA12237F 3 14 3 PS9829B 3 15 4 PT6324 3 15 5 STR S6757IF1905 3 16 6 TAS5142 3 17 7 U1739EJ2V1UD00 KF2_E 3 18 WIRING DIAGRAM 3 20 BLOCK DIAGRAM 3 22 1 SMPS BLOCK DIAGRAM 3 22 2 MAIN FRONT BLOCK DIAGRAM 3 24 SCHEMATIC DIAGRAMS 3 26 1 SMPS SCHEMATIC DIAGRAM 3 26 2 MAIN SCHEMATIC DIAGRAM 3 28 3 AMP SCHEMATIC DIAGRAM 3 30 4 DECK SCHEMATIC DIAGRAM 3 32 5 FRONT SCHEMATIC DIAGRAM 3 34 PRINTED...

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: ...lume control knob 8 PUSH EJECT position TAPE 1 9 PUSH EJECT position TAPE 2 10 RECORD RECORD PAUSE REC button TUN buttons AUTO TUNING REWIND FAST FORWARD TAPE SCAN TEMPO buttons CD PRESET buttons TAPE REVERSE PLAY button OPTIONAL TAPE FORWARD PLAY button STOP STOP button 11 MIC JACKS MIC1 MIC2 ø6 3 mm OPTIONAL 12 MIC VOLUME knob 13 Remote control sensor 14 OPEN CLOSE OP CL button DISC SKIP D SKIP ...

Page 7: ...ARKER SEARCH MUTE buttons TEMPO SCAN KEY CON b SKIP 17 VOLUME buttons 18 TITLE button Use the TITLE button to display the title screen included on DVD video discs 19 DISPLAY button 20 DIMMER button 21 SLEEP button 22 DISC SKIP D SKIP button REMOTE CONTROL PRESET PRESET PRESET PRESET SETUP SETUP TEMPO TEMPO MENU MENU REPEA REPEAT MARKER MARKER SEARCH SEARCH REPEA REPEAT A B A B PROG MEMO PROG MEMO ...

Page 8: ...3 Signal to noise ratio audio More than 75dB 1kHz MTT 111 Signal to noise ratio video More than 55dB 1kHz NORMAL SPEED Dynamic range audio More than 75dB Wow Flutter 0 25 Video output 1 0V p p 75Ω MTT 111 JIS WTD S video output Y 1 0V p p 75Ω F F REW Time 120sec C 60 C 0 3V p p 75Ω Frequency Response 250 8000Hz Component Video output Y 1 0V p p 75Ω Signal to Noise Ratio 43dB Pb Pr 0 7V p p 75Ω Cha...

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

Page 10: ... 264 452 458 450 450 290 290 454 450 450 A00 257 255 259 A43 A44 253 453 253 254 252 450 450 450 CABLE4 CABLE3 CABLE1 CABLE5 CN201 P9701 P9702 260 MAIN SMPS 291 B M A L C O O D K H L J D I M A41 450 CABLE2 P5701 DVD FRONT 252 450 282 258 2 1 2 2 SECTION 2 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION ...

Page 11: ...011 013 022 025 015 023 BRASS MOTOR PULLEY MAYBE CHANGED FORWOW FLUTTERWHEN NECESSARY RING FW MAYBE ADDED FORWOW FLUTTERWHEN NECESSARY RING FW MAYBE ADDED FORWOW FLUTTERWHEN NECESSARY 2 3 2 4 TAPE DECK MECHANISM EXPLODED VIEW 1 TAPE DECK MECHANISM A R A S RIGHT A R DECK ...

Page 12: ...2 5 2 6 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 TAPE DECK MECHANISM A R A S LEFT A S DECK ...

Page 13: ...7 166 417 167 416 177 175 172 180 417 170 419 417 418 418 169 A30 A26 181 432 431 435 430 430 438 035 021 035A 036 430 012A 012A 012A 439 025 024 030 156 155 153 173 169A 169B 169C 168 163 162 441 440 422 DVD MECHANISM EXPLODED VIEW ...

Page 14: ...A80A A80R A80L A80BR A80BL WIRE80 WIRE81 850 855 856 857 858 860 861 863 859 851 853 852 854 862 2 9 2 10 SPEAKER EXPLODED VIEW MODEL MDS262V FRONT SPEAKERS ...

Page 15: ...2 11 2 12 MEMO MEMO ...

Page 16: ...2 13 PACKING ACCESSORY VIEW ...

Page 17: ...901 NO NO NO YES Check short of P9701 P9702 line Replace the fuse Check the DC V of C905 If DC V is over 400V NO Check BD901 LF901 902 Check the DC V of C981 C945 If DC V is 6 1V NO Check short of P9702 line YES YES Chcek the DC V of C950 C951 If DC V is in 35 5V NO Check short of P9701 line Chcek the DC V of C909 C903 C921 If DC V is in 14 19V and it is steady YES ...

Page 18: ...cuit Trouble shooting NO OK 4 MICOM PART CHECK I MICOM part check I OK OK YES YES Check P SENS P7904 _PIN6 NO Refer to SMPS troubleshooting YES YES YES Check both end voltage of IC101 KIA7042 Check if input voltage of IC101 KIA7042 is over 5V YES NO Check the periphery of IC101 KIA7042 NO YES Check if IC101 KIA7042 of output voltage is over 4 3V Check voltage of IC100 78KO KF2_PIN1 NO Replace IC10...

Page 19: ...0_PIN19 20 59 are 5V NO NO YES YES Check if voltage of P7904_PIN5 is 5 6V NO Refer to SMPS troubleshooting YES YES YES OK YES Check both end voltage of D101 YES YES Check D101 NO Check if output of D101 1SR35 is 5V YES YES YES YES Check IC101 Q102_collector 0 6V LOW OK Check if output of IC101 KIA7042 is over 4 3V OK NO Replace IC101 NO Replace D101 YES Check Q102 OK NO Replace Q102 ...

Page 20: ...3 4 Check IC100 78KOKF2 _ PIN 22 24 OK YES YES Refer to micom troubleshooting Check micom voltage 5V PIN22 DATA PIN24 CLK NO NO YES Replace micom Check micom NO YES OK 6 IC103 KS4CD21CS CHECK ...

Page 21: ...tion NO If voltage is not 5V check input and output of D319 1SR35 YES Check P3702 connection and power Pin1 FL 22 Pin2 FL 26 Pin3 VKK over 26V YES YES YES YES OK OK 76 PIN DO Check DATA in Check IC100 NO IC100 75 PIN STB 77 PIN 4PIN DI 78 PIN 1PIN CLK Check data output IC100 Check IC301 DATA communication PIN PIN 75PIN 3PIN STB 76PIN 2PIN D 78PIN 1PIN CLK Check IC301 PT6324 voltage Pin50 VKK 26V P...

Page 22: ... and voltage NO Check X601 12 288MHz Replace X601 OK NO OK YES YES NO Replace FB614 NO Check IC605_ PIN2 output YES OK YES OK Replace IC605 NO Check R680 470Ω output Replace R680 NO Check IC604 PS9829 DATA input Check each LINE registor output NO Check IC604 PS9829 DATA input 78 PIN DATA 79 PIN CLK Check PWM modulator output FL 75 74 FR 71 70 NO NO Check DVD ASS Y PS9829 communication P7403 Refer ...

Page 23: ...17 18 19 36 12V input Refer to SMPS troubleshooting YES YES YES NO P7905_3PIN 12V PIN13 14 15 35V YES Replace the coils YES NO Check output line coil Check PWM modulator input Each IC PIN4 6 14 16 YES Power IC700 701 702 703 PIN20 27 29 34 output Check each IC700 701 702 703 PIN21 26 29 34 input voltage OK 9 POWER AMP PART CHECK ...

Page 24: ...YES YES Check IC200 BU4052 _ PIN4 11 input waveform Check IC200 BU4052 _PIN16 VDD PIN8 VSS power Refer to SMPS troubleshooting NO NO YES Replace IC801 OK YES YES Check IC801 MC4580 _PIN 2 6 input waveform Check IC801 MC4580 _PIN4 VSS PIN8 VDD power Check IC200 BU4052 _ PIN3 13 output waveform Check JK800 connection ...

Page 25: ...output waveform and IC601 BU4052 _PIN2 15 input waveform Check TUNER module voltage PIN2 9V YES YES YES YES NO Check TUNER module TU601 operation YES Check IC801 MC4580 _ PIN4 VSS PIN8 VDD power YES NO Check IC801 MC4580 _ PIN2 6 input waveform Replace IC200 Replace IC200 Replace IC801 Check IC200 BU4052 _PIN1 12 input waveform OK ...

Page 26: ...YES YES NO Check IC200 BU4052 _PIN2 15 input waveform Check IC200 BU4052 _ PIN16 VDD PIN8 VSS power YES NO Check IC801 MC4580 _ PIN2 6 input waveform YES Replace IC200 Replace IC200 Replace IC200 Check IC200 BU4052 _PIN3 13 output waveform and IC601 BU4052 _ PIN2 15 input waveform YES TAPE PCB ASS Y OK ...

Page 27: ...201_PIN32 39 and B deck head input IC201_PIN34 37 YES YES YES YES Check IC201_ PIN5 26 signal output Check IC201 HA12237 _PIN16 12V input Check A B deck head input NO Refer to SMPS troubleshooting Check IC202_PIN10 HIGH NO Check IC201_PIN14 mute operation Replace IC201 NO YES OK Check IC201 YES Replace IC202 NO YES OK OK Check IC202 ...

Page 28: ...nput Check P2203_PIN5 3 input and PIN8 erase input YES YES YES YES YES Check L203_PIN2 3 oscillation Check IC604 PS9829 _PIN49 52 PWM output Check Q205 D1304 _ base HIGH Replace IC201 NO NO Check IC201_ PIN10 21 output Check IC100_PIN23 HIGH NO Refer to PWM modulation troubleshooting OK YES Replace IC202 YES OK OK ...

Page 29: ...Huffman Decoder ROM DRAM Interface RAM Video Processor TV Encoder VDAC HDMI I F Display OSD SPU Controller Scaler DeIntelacer 16 K Cache 32 Bit RISC Processor Audio ADC Serial Audio Interface Audio DAC USB DVD Descrambler Transport ATAPI Servo Controller RF 8051 µController DSC ECC Digital PLL ...

Page 30: ...3 14 2 HA12237F ...

Page 31: ...e Converter Input Output MUX Serial Audio Output Interface Down Mixer Mixer 4 Band EQ Bass Manager Main Volume Trim Volume Serial Audio Output Interface PWM Modulator POP NR Power Supply Output Mapper PLL Reset Power Down Automatic Gain Limiter 4 PT6324 SG1 KS1 SG2 KS2 SG3 KS3 SG4 KS4 SG5 KS5 SG6 KS6 SG7 KS7 SG7 KS7 SG8 KS8 SG9 KS9 SG10 KS10 SG11 KS11 SG12 KS12 SG13 KS13 SG14 KS14 SG15KS15 SG16 KS...

Page 32: ...6757IF1905 4 Vcc Start Stop Burst OSC Protection latch DRIVE Reg Delay Burst Control BSD OCP GND S D FB FB OCP BD SS OLP BD Q Q S S R R MaxON R Q S OLP Reg Iconst Soft Start Counter Bottom Selector 5 7 6 3 2 1 OVP ...

Page 33: ...l PVDD GVDD 12 V VDD 12 V GND Hardwire OC Limit M1 M3 PVDD Power Supply Decoupling 32 V 12 V GND VAC PWM_A PWM_C PWM_D PWM_B VALID M2 Left Channel Output Right Channel Output Input HúBridge 1 Input H Bridge 2 GVDD VDD VREG Power Supply Decoupling 4 PVDD_A B C D GND_A B C D GVDD_A B C D 4 4 VDD GND VREG AGND OC_ADJ Bootstrap Capacitors 2nd Order L C Output Filter for Each Half Bridge SD OTW Output ...

Page 34: ...t timer event counter 00 TO00 TI010 P01 TO01 TI011 P06 TI000 P00 TI001 P05 TOH0 P15 TOH1 P16 TI50 TO50 P17 TI51 TO51 P33 RxD0 P11 TxD0 P10 RxD6 P14 TxD6 P13 SI10 P11 SO10 P12 SI11 P03 SO11 P02 SCK11 P04 SCK11 P05 SIA0 P143 SOA0 P144 SCKA0 P142 STB0 P145 BUSY0 P141 EXSCL0 P62 SDA0 P61 SCL0 P60 AVREF RxD6 P14 LINSEL INTP0 P120 INTP1 P30 to INTP4 P33 INTP5 P16 INTP6 P140 INTP7 P141 AVSS ANI0 P20 to A...

Page 35: ...3 19 MEMO ...

Page 36: ...D appear at FLD Does DISK1 appear at FLD Does it appear DVD ERROR at FLD Func Power ON Does AUX FM 87 5 AM USB appear at FLD YES Check connector P7501 Check connector P400 P4004 P401 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 P5701 NO NO NO NO YES OK Reconnect it ...

Page 37: ... works properly Check the related circuit of ES6698FD IC501 PIN133 134 137 138 139 140 NO YES ES8380 VIDEO outputs properly Check the cable connection between DVD PCB and MD MECHA Check the MD mecha NO NO YES Does tray move inside when it is at closed position OPEN_SW CLOSC_SW signals on PIN401 are OK Check the output signal of ES8380 to IC401 for control OPEN CLOSE NO YES OPEN CLOSE signals on IC...

Page 38: ...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 YES Check the motor driver IC401 Proper F F outputs NO Check cable connection with pick up head ...

Page 39: ...ed circuit of laser power transistor Collector voltage of power transistor is OK Q405 Q406 NO YES YES YES C D Check cable connection between P400 and pick up head Check the SPINDLE related circuit on ES8380 Does SPINDLE rotate Proper SPINDLE signal on ES8380 NO Check the SPINDLE control of motor driver IC404 SPIN SPIN output properly NO NO YES YES YES Check the cable connection between P400 and MD...

Page 40: ...O Proper FOO signal on IC401 NO NO YES YES YES D E Check cable connection between P400 and MD Check the related circuit between IC401 and ES8380 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 41: ... are OK during playing DISK Audio signal data on P8380 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 ES8380 video signal data TEST END Picture signal data on ES8380 is OK NO NO ...

Page 42: ...5701 NO Check the HRST signal Check the USB PART and DVD PART line NO NO Check the USB DATA LINE P5301 Check the IC501 ES8380 Check DATA LINE PIN 98_USB_NO 99_PO OK YES Checking or USB display check NO YES Check the USB JACK POWER supply Check P5301 Reading OK check NO ...

Page 43: ...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 44: ...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 45: ...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 46: ...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 47: ...4 12 8 TRACKING SIGNAL 1 Tro 2 Tr 3 Tr 9 RF WAVEFORM ...

Page 48: ...4 13 10 DISK TYPE JUGEMENT WAVEFORM 1 F 2 FDO 3 SVRRF DVD CD ...

Page 49: ...4 14 MEMO ...

Page 50: ...4 15 4 16 SCHEMATIC DIAGRAMS 1 MPEG SCHEMATIC DIAGRAM ...

Page 51: ...4 17 4 18 2 SERVO SCHEMATIC DIAGRAM ...

Page 52: ...3 INTERFACE SCHEMATIC DIAGRAM 4 19 4 20 ...

Page 53: ...4 21 4 22 DVD P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAM ...

Page 54: ...4 23 4 24 DVD P C BOARD BOTTOM VIEW ...

Page 55: ...4 25 4 26 MEMO MEMO ...

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