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3-2

ELECTRICAL TROUBLESHOOTING GUIDE

Is 5.6V present at collector
of Q126?

No 3.3VA

YES

Is 3.3V present at emitter
of Q121?

YES

Is 3.3VA section working?

YES

Is 3.3VA section working?

YES

No 5V

No 3.3VA.

Replace Q126.

Check FR101

Replace Q121.

YES

Is there a DC voltage at
Cathode of D105 or D107?

YES

NO

NO

NO

NO

Check D105/D106/D107/
D108 and replace.

Replace IC101.

1. POWER CHECK FLOW

A.

B.

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Summary of Contents for DV286

Page 1: ...ER SERVICE MANUAL MODELS DVX286 DV286 DV286K CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODELS DVX286 DV286 DV286K SERVICE MANUAL P N AFN31629357 JANUARY 2007 http biz lgservice com ...

Page 2: ...CONTENTS SECTION 1 SUMMARY SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL SECTION 4 MECHANISM DP 11 SECTION 5 REPLACEMENT PARTS LIST ...

Page 3: ...RODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES SERVICE INFORMATION FOR EEPROM 1 5 SPECIFICATIONS 1 6 ...

Page 4: ...ONLY POTENTIAL SOURCE OF X RAYS IN CURRENT T V RECEIVERS IS THE PICTURE TUBE HOWEVER THIS TUBE DOES NOT EMIT X RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND UNDER CERTAIN CIRCUMSTANCES MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVEL...

Page 5: ...panels Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components The following techniques should be use...

Page 6: ... once Change will be applied when power OFF ON Use arrow key F D G E to move to approprite position and make changes DVD LOGO Status NO Disk status Remotecontrol Pause key 1 4 7 2 in order MODEL NAME HEX OPT 1 00 OPT 2 00 OPT 3 00 OPT 4 00 OPT 5 00 OPT 6 00 OPT 7 00 OPT 8 00 DETECT NEW EEPROM OPTION EDIT SCREEN ...

Page 7: ...1 0 V p p 75Ω negative sync RCA jack x 1 Pb Pr 0 7 V p p 75Ω RCA jack x 2 AUDIO OUT 2 0Vrms 1 KHz 0 dB 600Ω RCA jack L R x 1 Scart to TV DIGITAL OUT COAXIAL 0 5V p p 75Ω RCA jack x 1 Scart model only SYSTEM Laser Semiconductor laser wavelength 650 nm Signal system PAL NTSC Frequency response DVD PCM 96kHz 8Hz to 44kHz DVD PCM 48 kHz 8Hz to 22kHz CD 8Hz to 20kHz Signal to noise ratio More than 90dB...

Page 8: ...2 1 SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 2 1 CABINET AND MAIN FRAME SECTION 2 2 2 DECK MECHANISM SECTION DP 11 2 3 3 PACKING ACCESSORY SECTION 2 4 ...

Page 9: ...0 463 461 462 462 463 460 250 462 A48 A43 462 A44 A49 A42 A41 A46 P101 P8601 CABLE1 CN903 A47 300 A26 283 452 280 279 276 261 261 260 262 320 467 465 261 KARAOKE MAIN SMPS 5 1CH SCART KEY TIMER 2 2 EXPLODED VIEWS 1 CABINET AND MAIN FRAME SECTION 275 ...

Page 10: ...2 3 2 DECK MECHANISM SECTION DP 11 A26 A02 439 018 013 017 014 001 002 003 020 016 015B 015A 435 015 019 440 432 012A 010 439 431 435 030 024 025 036 A03 430 021 012A 012 012 026 A01 ...

Page 11: ...2 4 3 PACKING ACCESSORY SECTION ...

Page 12: ...ICTURE 3 22 3 CN202 CONNECTOR PICTURE 3 22 4 CN601 CONNECTOR PICTURE 3 23 5 CN602 CONNECTOR PICTURE 3 23 6 CN605 CONNECTOR PICTURE 3 24 7 CN703 CONNECTOR PICTURE 3 24 8 CN704 CONNECTOR PICTURE 3 25 9 P101 CONNECTOR PICTURE 3 25 BLOCK DIAGRAMS 3 26 1 OVERALL BLOCK DIAGRAM 3 26 2 POWER SUPPLY BLOCK DIAGRAM 3 27 3 SERVO BLOCK DIAGRAM 3 28 4 MPEG MEMORY BLOCK DIAGRAM 3 29 5 VIDEO BLOCK DIAGRAM 3 30 6 ...

Page 13: ... 3 3V present at emitter of Q121 YES Is 3 3VA section working YES Is 3 3VA section working YES No 5V No 3 3VA Replace Q126 Check FR101 Replace Q121 YES Is there a DC voltage at Cathode of D105 or D107 YES NO NO NO NO Check D105 D106 D107 D108 and replace Replace IC101 1 POWER CHECK FLOW A B ...

Page 14: ...tion SLED at inner side SLED moves to inner position 1 Judge whether have disc and disc type 2 Jump to related disc reading procedure Recieve OPEN CLOSE Key 1 Execute pressed Key IR key 2 System operation routine loop 1 Stop playback open Tray 2 Display tray open message LOGO Receive CLOSE Key NO YES YES NO YES YES NO NO 2 SYSTEM OPERATION FLOW ...

Page 15: ...PCBA YES NO Make sure the main PCBA don t short on VCCs and switch it on YES Is 3 3V and 1 8V DC outputs normal on main PCBA Check the regulators or related diodes YES NO Connect to PC RS232 cable and update the FLASH memory code Update FLASH successfully 1 Check 27MHz system clock 2 Check system reset circuit 3 Check FLASH R W enable signal PRD RWR 4 Check RS232 SIGNALS 5 Check FLASH Memory relat...

Page 16: ...ck the related circuit of MT1389E Have TV signal output NO YES Check the filtering and amp circuit of TV signal Check AV cable connection to TV set Does tray move inside when it is not at closed position NO Normal TROUT TRIN signals NO YES Check the load OPEN CLOSE switch Normal TRCLOSE TROPEN signal NO YES Check the tray control I O pins on MT1389E IP9008 Normal LOAD LOAD signal NO YES Check the ...

Page 17: ...cuit of FMSO SL and SL output properly NO YES Check the amp circuit on motor driver Check the cable connection with MECHA Optical Lens has movements for searching focus Do not put in disc and tray close NO Proper FOSO outputs to motor driver NO YES Check FOSO connection on MT1389E and motor dirver Proper F F outputs NO YES Check the amp circuit on motor dirver C Check cable connect on with pick up...

Page 18: ...ble connection between transistor ouput and pick up head Disc ID is correct NO Laser off Put disc in NO Proper RFL signal on MT1389E NO YES Check the related circuit on MT1389E RFL signal Check LDO1 LDO2 signal YES YES Does spindle rotate NO Proper DMSO signal on MT1389E NO YES Check DMSO related circuit on MT1389E SP SP output properly NO YES Check the spindle control amp circuit of motor driver ...

Page 19: ...driver Check FOSO signal on MT1389E Track on OK NO NO Normal TEO Signal on MT1389E NO YES Check the related circuit on MT1389E YES YES YES T T output properly NO YES Check the tracking control amp circuit on motor driver Properly TRSO signal on MT1389E NO YES Check the TRSO connection on MT1389E and motor dirver Check cable connection on pick up head Disc is play Check RFO RFLVL signal waveform E ...

Page 20: ... audio DAC Normal audio DAC out NO Check the related circuit of audio DAC Check audio filter amplify mute circuit Normal IR VFD Front pannel key functions NO NO Communications between IR VFD Front pannel key MT1389E is normally NO YES Check communication lines on MT1389E YES YES TEST END Check the cable connection on Front pannel ...

Page 21: ...ND WAVEFORMS ON SYSTEM TEST AND DEBUGGIBG 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 MT1389E main clock is at 27MHz X601 FIG 1 1 1 1 2 MT1389E reset is low active FIG 1 2 2 3 4 3 3 3V PWR_CTL IC602 RESET TIME 4 2 ...

Page 22: ...3 11 3 RS232 waveforn during procedure Downloading FIG 1 3 5 6 TXD RXC 5 6 4 Flash R W enable signal during download Downloading FIG 1 4 7 8 PRD PWR 7 8 IC602 ...

Page 23: ...3 12 2 SDRAM CLOCK FIG 2 1 9 9 DCLK 128MHz Vp p 2 2 Vmax 2 7V IC603 3 TRAY OPEN CLOSE SIGNAL FIG 3 1 10 11 12 13 11 IC601 10 12 13 TRIN TROUT TRCLOSE TROPEN ...

Page 24: ...DISC CONDITION FIG 4 1 14 15 16 17 14 16 17 15 FMSO 1 9V 1 4V 1 1V STBY 3 3V SL 4 2V 2 8V 1 2V SL 4 2V 2 8V 1 5V 5 LENS CONTROL RELATED SIGNAL NO DISC CONDITION 18 19 20 18 20 19 FOSO 1 5V 1 4V 1 3V F 3 2V 2 7V 2 2V F 3 2V 2 7V 2 2V FIG 5 1 ...

Page 25: ...ASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION FIG 6 1 21 22 23 22 23 21 MDI1 0V 180mV LD02 3 3V 2 3V LD01 3 3V 2 3V IC601 7 DISC TYPE JUDGEMENT WAVEFORM 24 25 26 25 26 24 F FE RFL CN201 IC601 FIG 7 1 DVD ...

Page 26: ...3 15 FIG 7 2 DVD F FE RFL FIG 7 3 CD F FE RFL ...

Page 27: ...3 16 FIG 7 4 CD F FE RFL 8 FOCUS ON WAVEFORM 27 28 29 30 27 28 29 30 FE FOSO F F IC601 FIG 8 1 DVD ...

Page 28: ...3 17 FIG 8 2 CD FE FOSO F F 9 SPINDLE CONTROL WAVEFORM NO DISC CONDITION 31 32 33 31 32 33 DMSO 1 4V 1 8V SP 3 6V 2 4V SP 3 6V 4 8V FIG 9 1 ...

Page 29: ...3 18 10 TRACKING CONTROL RELATED SIGNAL SYSTEM CHECKING 34 35 36 37 34 35 36 37 TE TRSO T T TE TRSO T T IC601 CN201 FIG 10 2 CD FIG 10 1 DVD ...

Page 30: ...3 19 11 MT1389E AUDIO OPTICAL AND COAXIAL OUTPUT SPDIF FIG 11 1 38 38 IC601 12 MT1389E VIDEO OUTPUT WAVEFORM 1 100 FIG 12 1 ...

Page 31: ...3 20 2 COMPOSITE VIDEO SIGNAL FIG 12 2 13 AUDIO OUTPUT FROM MT1389E FIG 13 1 ...

Page 32: ...3 21 CONNECTOR PICTURE 1 FULL CONNECTOR PICTURE ...

Page 33: ...3 22 CN201 22PIN 2 CN201 CONNECTOR PICTURE CN202 9PIN 3 CN202 CONNECTOR PICTURE ...

Page 34: ...3 23 CN601 12PIN 4 CN601 CONNECTOR PICTURE CN602 10PIN 5 CN602 CONNECTOR PICTURE ...

Page 35: ...3 24 CN703 12PIN 7 CN703 CONNECTOR PICTURE CN605 5PIN 6 CN605 CONNECTOR PICTURE ...

Page 36: ...3 25 CN704 9PIN P101 10PIN 8 CN704 CONNECTOR PICTURE 9 P101 CONNECTOR PICTURE ...

Page 37: ...3 26 BLOCK DIAGRAMS 1 OVERALL BLOCK DIAGRAM ...

Page 38: ...3 27 2 POWER SUPPLY BLOCK DIAGRAM ...

Page 39: ...3 28 3 SERVO BLOCK DIAGRAM ...

Page 40: ...3 29 4 MPEG MEMORY BLOCK DIAGRAM ...

Page 41: ...3 30 5 VIDEO BLOCK DIAGRAM ...

Page 42: ...3 31 6 AUDIO BLOCK DIAGRAM ...

Page 43: ...3 32 MEMO ...

Page 44: ... 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 CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SER...

Page 45: ...3 35 3 36 2 SYSTEM MPEG CIRCUIT DIAGRAM ...

Page 46: ...3 37 3 38 3 SERVO CIRCUIT DIAGRAM ...

Page 47: ...3 39 3 40 4 AV JACK CIRCUIT DIAGRAM ...

Page 48: ...3 41 3 42 5 KARAOKE USB CIRCUIT DIAGRAM 8 9 TOOL ...

Page 49: ...3 43 3 44 6 TIMER KEY CIRCUIT DIAGRAM 4 7 TOOL ...

Page 50: ...3 45 3 46 7 TIMER KEY CIRCUIT DIAGRAM 5 TOOL ...

Page 51: ...3 47 3 48 8 TIMER KEY CIRCUIT DIAGRAM 8 TOOL ...

Page 52: ...3 49 3 50 9 TIMER KEY CIRCUIT DIAGRAM 9 TOOL ...

Page 53: ... 620 213 1 619 214 1 306 215 0 89 216 3 2 PIN NO VOLTAGE IC602 1 3 04 2 0 4 3 0 4 4 3 16 5 3 11 6 0 6 7 1 7 8 1 05 9 0 10 0 3 11 3 23 12 3 25 13 3 25 14 3 25 15 1 68 16 0 17 3 03 18 1 83 19 0 20 2 25 21 2 14 22 2 1 23 1 85 24 0 25 2 05 26 0 27 0 28 0 29 1 58 30 0 31 1 48 32 0 33 1 29 34 0 35 0 9 36 0 37 0 3 38 1 56 39 1 13 40 1 62 PIN NO VOLTAGE 41 0 42 1 05 43 0 44 0 8 45 2 1 46 0 47 0 4 48 0 45 ...

Page 54: ...3 53 3 54 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 55: ...3 55 3 56 2 KEY P C BOARD 4 TOOL 5 TOOL 7 TOOL 8 TOOL 9 TOOL 3 TIMER P C BOARD 4 TOOL 5 TOOL 7 TOOL 8 TOOL 9 TOOL 4 KARAOKE P C BOARD KARAOKE MODEL ONLY 4 TOOL 5 TOOL 7 TOOL 8 TOOL 9 TOOL WITHOUT ...

Page 56: ...3 57 3 58 5 SMPS P C BOARD 6 SUB SCART OPTIONAL PART 430mm 7 SUB 5 1CH OPTIONAL PART 430mm ...

Page 57: ...3 59 3 60 MEMO MEMO ...

Page 58: ...y Disc 4 3 1 1 1 Plate Clamp 4 3 1 1 2 Magnet Clamp 4 3 1 1 3 Clamp Upper 4 3 2 TRAY DISC 4 3 3 BASE ASSEMBLY SLED 4 4 3 1 Gear Feed 4 4 3 2 Gear Middle 4 4 3 3 Gear Rack 4 4 4 RUBBER REAR 4 4 5 FRAME ASSEMBLY UP DOWN 4 5 6 BELT LOADING 4 5 7 GEAR PULLEY 4 5 8 GEAR LOADING 4 5 9 GUIDE UP DOWN 4 5 10 PWB ASSEMBLY LOADING 4 5 11 BASE MAIN 4 5 EXPLODED VIEW 1 DECK MECHANISM EXPLODED VIEW 4 7 ...

Page 59: ... Gear Rack 1 Screw 4 3 9 1 2 7 11 Rubber Rear 4 3 1 2 7 12 Frame Assembly 1 Screw Bottom 4 4 Up Down 1 2 13 Belt Loading 1 Locking Tab 4 4 1 2 13 14 Gear Pulley 4 4 1 2 13 14 15 Gear Loading 1 Locking Tab 4 4 1 2 7 12 16 Guide Up Down 4 4 13 14 1 2 13 17 PWB Assembly 1 Locking Tab Bottom 4 4 Loading 1 Hook 2Screw 1 2 7 12 13 14 15 18 Base Main 2 Locking Tabs 4 4 16 17 TOP VIEW WITH TRAY BOTTOM VIE...

Page 60: ...ounterclockwise direction and then lift up the Plate Clamp 1 1 2 Magnet Clamp 1 1 3 Clamp Upper 2 TRAY DISC FIG 4 2 1 Insert and push a Driver in the emergency eject hole A at the right side or put the Driver on the Lever B of the Gear Emergency and pull the Lever B in direction of arrow so that the Tray Disc is ejected about 15 20mm 2 Pull the Tray Disc until it is separated from the Base Main co...

Page 61: ...4 4 3 BASE ASSEMBLY SLED FIG 4 3 1 Release 4 Screw S2 2 Disconnect the FFC Connector C1 3 1 Gear Feed 3 2 Gear Middle 3 3 Gear Rack 1 Release the Scerw S3 4 RUBBER REAR FIG 4 3 FIG 4 3 ...

Page 62: ...lock the Locking Tab L4 in direction of arrow B and then separate the Gear Pulley from the Base Main 8 GEAR LOADING FIG 4 4 9 GUIDE UP DOWN FIG 4 4 1 Move the Guide Up Down in direction of arrow A as Fig A 2 Push the Locking Tab L5 down and then lift up the Guide Up Down to separate it from the Base Main Note When reassembling place the Guide Up Down as Fig C and move it in direction arrow B until...

Page 63: ...4 6 MEMO ...

Page 64: ...1 002 003 020 439 018 013 017 015B 015A 440 019 012 015 012 432 030 010 439 431 435 021 430 024 025 036 012A 012A 026 016 435 014 A01 A02 A03 A00 4 7 4 8 EXPLODED VIEW 1 DECK MECHANISM EXPLODED VIEW DP 11 ...

Page 65: ...4 9 4 10 MEMO MEMO ...

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