LG DK854 Page 22 Service Manual Download

Page: 22 / 69

3-9

LGE Internal Use Only

YES

Check the laser power circuit

on MT1389L and connecting

to power transistor.

Check cable connection

between transistor ouput

and pick-up head.

Laser off

YES

Check the related circuit

on RF signal.

Check DVD_LD &

CD_LD signal

YES

Check SPD_PWM related

circuit on MT1389L.

YES

Check the spindle control

amp circuit of motor driver

Check the cable connection

between spindle and main

PCBA.

YES

Laser

turns on when reading

disc?

DVD_LD,

CD_LD output properly?

Check the related circuit on

laser power transistor

Collector

voltage of power transistor

is OK?

Put disc in?

Disc ID is correct?

Does spindle rotate?

Proper

SPD_PWM signal on

MT1389L

& FAN_SPN- output

properly?

Proper RF signal

on OPU

ELECTRICAL TROUBLESHOOTING GUIDE

Summary of Contents for DK854

Page 1: ... MODEL DK867 DK855 DK854 DV840 CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL DK867 DK855 DK854 DV840 SERVICE MANUAL P NO AFN35874449 DECEMBER 2007 Website http biz lgservice com Internal Use Only ...

Page 2: ...nics Inc All right reserved Only for training and service purposes LGE Internal Use Only CONTENTS SECTION 1 SUMMARY SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL SECTION 4 MECHANISM DP 12V SECTION 5 REPLACEMENT PARTS LIST ...

Page 3: ... for training and service purposes LGE Internal Use Only PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES THE PROCESS OF DISC DOWNLOAD 1 5 SPECIFICATIONS 1 7 ...

Page 4: ... per the original design Be sure that the safety purpose of the polarized line plug has not been defeated 3 Soldering must be inspected to discover possible cold solder joints solder splashes or sharp solder points Be certain to remove all loose foreign particles 4 Check for physical evidence of damage or deterioration to parts and components for frayed leads or damaged insulation including the AC...

Page 5: ...Mohm Note 1 Accessible Conductive Parts include Metal 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 ...

Page 6: ...ing the cursor button and then choose a TV Aspect menu And choose 16 9 menu 4 Press the 1 3 9 7 1 3 9 numerical button Enter key on remote control to confirm the system information 5 Remember or write the model name 6 Change the program file name of new version to the model name Ex New ver program file LG_DV_LV80F7FC10EMSMIS_V014 ROM Model name LG_DV_LV81F7FC00EMS Change New ver program file like ...

Page 7: ...s on the screen Disc will emerge from DVD player automatically Take the disc out of the DVD player 11 After Disc download is completed DVD player turns off and then turns on automatically 12 Do it again the process 1 2 3 4 to confirm the version 1 6 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 8: ... 35 x 195mm W x H x D without foot Net Weight Approx 2 3kg Operating temperature 5 C to 35 C Operating humidity 5 to 90 Laser Semiconductor laser Signal system PAL NTSC OUTPUTS Video Output 1 0V p p 75Ω sync negative RCA jack x 1 Component Video Output Y 1 0V p p 75Ω sync negative RCA jack x 1 Pb Pr 0 7V p p 75Ω RCA jack x 2 Audio Output 2 0Vrms 1kHz 0dB 600Ω RCA jack L R x 1 Digital Output Coaxia...

Page 10: ...l right reserved Only for training and service purposes LGE Internal Use Only SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 2 1 CABINET AND MAIN FRAME SECTION 2 2 2 DECK MECHANISM SECTION DP 12V 2 3 3 PACKING ACCESSORY SECTION 2 4 ...

Page 11: ...ART 276 463 KARAOKE USB A43 280 279 KEY CN903 452 D A49 CABLE1 TIMER 452 452 462 A44 261 261 260 262 320 465 261 A42 A41 CABLE2 461 275 CN801 CN802 EXPLODED VIEWS 2 2 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 1 CABINET AND MAIN FRAME SECTION ...

Page 12: ... Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 DECK MECHANISM SECTION DP 12V 442 442 010 442 012 012 037 012 019 026 440 015 017 013 439 018 A02 A26 A01 001 002 003 014 015A 015B 016 020 435 A03 ...

Page 13: ...purposes LGE Internal Use Only 3 PACKING ACCESSORY SECTION 808 Battery 810 Cable Set Ass y OPTIONAL PARTS 832 Disc 806 RF Cable 811 Plug Ass y 1way Yellow 820 Plug Ass y 1way Black 801 Owner s Manual 804 Packing Sheet 803 Packing 812 Plug Ass y 2way 900 Remocon 803 Packing 802 Box Carton ...

Page 14: ...UT WAVEFORM 3 19 12 AUDIO OUTPUT FROM MT1389L 3 20 CONNECTOR PICTURE 3 21 1 ALL CONNECTOR PICTURE 3 21 2 CN201 CONNECTOR PICTURE 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 CN701 CONNECTOR PICTURE 3 24 BLOCK DIAGRAMS 3 25 1 OVERALL BLOCK DIAGRAM 3 25 2 POWER SMPS BLOCK DIAGRAM 3 26 3 SYSTEM BLOCK DIAGRAM 3 27 4 ...

Page 15: ...Main PCB DVD is short Is the FR101 normal Replace the D105 D106 D107 D108 YES NO Is the D105 D106 D107 D108 normal Check or Replace the IC101 YES NO Is the Vcc about 17V supplied to IC101 Pin2 Replace the D121 YES NO Is the D121 normal Replace the IC103 YES NO Is there about 2 5V at the IC103 Pin1 Replace the D123 YES NO Is the D123 normal Replace the D125 YES NO Is the D125 normal ELECTRICAL TROU...

Page 16: ...k or Replace the Q126 Is the Vcc 5 6V supplied to Q126 Collector Check the PWR CTL H signal from µ com YES NO Is the Vcc 12V supplied to Q126 Base ELECTRICAL TROUBLESHOOTING GUIDE No 12V Check or Replace the D125 YES YES NO Check or Replace the Q123 Is the Vcc 14V supplied to Q123 Collector Check the PWR CTL H signal from µ com YES NO Is the Vcc 12V supplied to Q126 Base ...

Page 17: ...UIDE Is 5 6V present at collector of Q126 No 3 3VA YES YES YES 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 Replace IC101 2 POWER CHECK FLOW A B Check D105 D106 D107 D108 and replace Is 3 3VA section working Is 3 3VA section working Is 3 3V present at emitter of Q121 ...

Page 18: ...ode to SDRAM 3 Reset RISC Show LOGO Tray close to closed position SLED moves to inner position 1 Judge whether have disc and disc type 2 Jump to related disc reading procedure 1 Execute pressed Key IR key 2 System operation routine loop 1 Stop playback open Tray 2 Display tray open message LOGO NO YES YES NO YES YES NO NO 3 SYSTEM OPERATION FLOW Tray closed SLED at inner side Recieve OPEN CLOSE Ke...

Page 19: ...and switch it on YES Check the regulators or related diodes YES NO Connect to PC RS232 cable and update the FLASH memory code 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 related circuit NO A YES Check the AC Voltage Power PCBA 110V or 220V Update FLASH successfully Is the DC voltage outputs OK 5V 3 3V 12...

Page 20: ... and amp circuit of TV signal Check AV cable connection to TV set NO NO YES Check the load OPEN CLOSE switch NO YES Check the Tray control IO pins on MT1389L AM5890S NO YES Check the Tray control amplifying circuit on Motor driver Check the cable connection between main PCBA and loader YES YES Show LOGO Flash memory operates properly MT1389L VIDEO outputs properly Normal OPEN_SW CLOSE_ SW signals ...

Page 21: ...HA Do not put in disc and tray close YES YES Check cable connect on with pick up head YES YES Motor Driver DR_MUTE Pin is High Is SLD_ PWM DC Level Higher than 1 65V FAN_SLD FAN_SLD output properly Does the SLED move to inner side when it is at outter position NO NO Check FOD connection on MT1389L and motor driver Proper FOD outputs to motor driver NO Check the amp circuit on motor driver Proper F...

Page 22: ...LD signal YES YES NO NO YES Check SPD_PWM related circuit on MT1389L NO YES Check the spindle control amp circuit of motor driver Check the cable connection between spindle and main PCBA YES YES Laser turns on when reading disc DVD_LD CD_LD output properly NO Check the related circuit on laser power transistor Collector voltage of power transistor is OK Put disc in Disc ID is correct Does spindle ...

Page 23: ... head Check RF signal waveform Focus on OK Proper signals on A B C D of MT1389L NO NO Check the TRD connection on MT1389L and motor driver Track on OK Disc is play Properly TRD signal on MT1389L NO Check the tracking control amp circuit on motor driver TRK TRK output properly NO NO Check the FOD connection on MT1389L and motor driver Check FOD signal on MT1389L YES Check the focus control amp circ...

Page 24: ...y mute circuit NO NO YES Check communication lines on MT1389L YES YES TEST END Check the cable connection on Front panel Normal Audio output when disc playback Audio AMP received correct data stream Commu nications between IR VFD Front panel key MT1389Lis normally Normal IR VFD Front panel key functions NO Check the related circuit of Audio AMP Normal Audio AMP out E ELECTRICAL TROUBLESHOOTING GUI...

Page 25: ... training and service purposes LGE Internal Use Only DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 MT1389L main clock is at 27MHz X601 FIG 1 1 1 1 2 MT1389L reset is active high FIG 1 2 2 3 4 2 3 4 3 3VA PWR_CTL RESET ...

Page 26: ...c All right reserved Only for training and service purposes LGE Internal Use Only 3 RS232 waveform during procedure Downloading FIG 1 3 5 6 5 6 TXD RXD 4 Flash CE enable signal and SCK signal during Downloading FIG 1 4 7 8 7 8 IC602 CE SCK ...

Page 27: ...Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 SDRAM CLOCK FIG 2 1 DCLK 128MHz Vp p 2 2 Vmax 2 7V IC603 3 TRAY OPEN CLOSE SIGNAL FIG 3 1 9 9 IC201 10 11 12 13 13 10 11 12 CLOSE_SW OPEN_SW CLOSE OPEN ...

Page 28: ...rnal Use Only 4 SLED CONTROL RELATED SIGNAL NO DISC CONDITION 5 LENS CONTROL RELATED SIGNAL NO DISC CONDITION FIG 5 1 FIG 4 1 14 15 16 17 18 19 20 SLD_PWM 1 9V 1 4V 1 1V DR_MUTE 3 3V FAN_SLD 4 2V 2 8V 1 2V FAN_SLD 4 2V 2 8V 1 5V FOD 1 8V 1 65V 1 5V FCS 3 5V 2 8V 2 0V FCS 3 3V 2 7V 1 5V 18 15 19 14 16 17 20 ...

Page 29: ... purposes LGE Internal Use Only 6 LASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION FIG 6 1 CN201 7 SPINDLE CONTROL WAVEFORM NO DISC CONDITION FIG 7 1 21 22 23 21 22 23 24 25 26 26 25 SPD_PWM 1 65V 0 3V FAN_SPN 4 5V 2 8V FAN_SPN 1V 2 8V MDI1 0V 180mV DVD_LD 3 3V 2 3V CD_LD 3 3V 2 3V 24 ...

Page 30: ...yright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 8 FOCUS ON WAVEFORM IC201 27 28 29 FOD FCS FCS 28 FIG 8 2 CD FOD FCS FCS 27 29 FIG 8 1 DVD 27 28 29 ...

Page 31: ...LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 9 TRACKING CONTROL RELATED SIGNAL SYSTEM CHECKING 30 31 32 TRD TRK TRK FIG 9 2 CD TRD TRK TRK FIG 9 1 DVD 30 32 31 30 31 32 ...

Page 32: ... 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 10 MT1389L AUDIO COAXIAL OUTPUT SPDIF 11 MT1389L VIDEO OUTPUT WAVEFORM 1 100 COLOR BAR 33 FIG 10 1 FIG 11 1 33 ...

Page 33: ...3 20 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 COMPOSITE VIDEO SIGNAL FIG 11 2 12 AUDIO OUTPUT FROM MT1389L FIG 12 1 ...

Page 35: ...3 22 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only CN201 MD 23PIN 2 CN201 CONNECTOR PICTURE CN202 MD 9PIN 3 CN202 CONNECTOR PICTURE ...

Page 36: ... 23 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only CN602 POWER 10PIN 5 CN602 CONNECTOR PICTURE CN601 FP 12PIN 4 CN601 CONNECTOR PICTURE ...

Page 37: ...4 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only CN605 KARAOKE 4PIN 6 CN605 CONNECTOR PICTURE CN701 SCART 12PIN 7 CN701 CONNECTOR PICTURE ...

Page 38: ...S_S TRACK_S VR_CD VR_DVD IOA SPDL_SENS IC702 Audio Op amp NJM4580M IC201 AM5890S 5Ch Motor Driver Pick up 3 3VA 3 3V IR Power Board Standby 5VA Motor 5V FP DATA FP STB FP CLK AC 90V 240V 50Hz 60Hz 12V Reset Circuit Built in IC201 RESET DRVSB OPEN CLOSE RFVDD33 V33A V18A V33 RFV33 To Front IC IR Receiver 27MHz IC601 MTK 1389L 5 1ch option ASDAT1_FL FR ASDAT2_RL RR ASDAT3_C W RFVDD33 MVCC CN603 DOWN...

Page 39: ...erved Only for training and service purposes LGE Internal Use Only 2 POWER SMPS BLOCK DIAGRAM 3 3V FILTER SWITCHING IC TRANS FEED B 3 3VA RECTIFIER 5 6V LPF RECTIFIER 14V LPF 12V PWR CTL 5V 5 6V M 5 6VA RECTIFIER 3 3V LPF AC100 240V RECTIFIER WITH 1389C ...

Page 40: ...D AUDIO In Interf terf ace ace IC603 16M bit SDRAM ASPDIF COAXIAL X601 X601 27M 27MHz Hz IC602 FLASH MEMORY 8 M USB KARAOKE JACK IC201 AM5890S 5Ch Motor Driver USB P RESET AL AR D_MUTE AUD AUDIO In Interf terf ace ace B_SC_ OUT R_SY_OU T CVBS Y_G_OUT RAM DAT 00 15 IR RCV IR IR Rece Receive iver FP_DATA FP_STB FP_CLK POWER_KEY SCK Hold SI SO CE WP OPTION USBN LED Driver SDCLK SDCKE DCS DBA1 DBA0 DR...

Page 41: ...ly 4 SERVO BLOCK DIAGRAM IC201 AM5890S 5Ch Motor Driver DVD A B C D RF CD A B C D E F RF PICKSEL1 SP SP M D DP11 PICK UP IM X601 IC601 MTK1389L DVDPLAYER ONE CHIP FMSO DMSO FOSO TRSO TROPEN TRCLOSE STBY F F T T LOAD LOAD 27MHz X TAL CDLD LD01 DVDLD LD02 V20 IOA TRIN TROUT ALPC SL SL MDI1 OP OP RESET Voltage detection ...

Page 42: ...ht reserved Only for training and service purposes LGE Internal Use Only 5 VIDEO BLOCK DIAGRAM MPEG 104 103 102 99 MM1692 Pr R Pb B SC Y G SY CVBS 8 9 12 13 6 14 4 11 RCA JACK Scart CVBS G B R CVBS Pr Pb Y SY SC Scart Control signal Video Drive IC ...

Page 43: ...l right reserved Only for training and service purposes LGE Internal Use Only 6 AUDIO BLOCK DIAGRAM A_L A_R MPEG MT1389L IC601 MUTE S W MUTE COAXIAL_SPDIF Coax Coaxial ial AMP AMP MC4580M MC4580M IC IC702 A out R A Out L JACK JACK FILTER BLOCK ...

Page 44: ...GE Internal Use Only WHEN SERVICING THIS CHASSIS UNDER 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 DIFFER FROM THE ACTUAL CIRCUIT ...

Page 55: ... 0 002 114 3 237 3 229 115 3 263 3 255 116 1 627 1 619 117 1 393 1 5 118 1 632 1 39 119 3 276 3 262 120 0 059 0 013 121 3 269 3 258 122 3 269 3 258 123 1 885 1 859 124 0 004 0 003 125 0 983 0 983 126 2 891 1 07 127 2 535 1 32 128 3 097 1 765 IC602 1 0 215 0 282 PIN No Disc Play 2 1 416 1 247 3 3 299 3 294 4 0 001 0 001 5 0 013 0 014 6 0 012 0 014 7 3 302 3 295 8 3 305 3 299 IC603 1 3 305 3 282 2 0...

Page 56: ...3 55 3 56 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 57: ...pyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 POWER SMPS P C BOARD TOP VIEW BOTTOM VIEW 3 5 1CH SCART P C BOARD OPTIONAL PART TOP VIEW BOTTOM VIEW ...

Page 58: ...pyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 4 KARAOKE USB P C BOARD OPTIONAL PART 4 1 4 TOOL TOP VIEW BOTTOM VIEW 4 2 5 TOOL TOP VIEW BOTTOM VIEW ...

Page 59: ...3 61 3 62 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 4 3 8 TOOL TOP VIEW BOTTOM VIEW 4 4 9 TOOL TOP VIEW BOTTOM VIEW ...

Page 60: ...c All right reserved Only for training and service purposes LGE Internal Use Only 5 KEY P C BOARD 5 1 4 TOOL TOP VIEW BOTTOM VIEW 6 TIMER P C BOARD 6 1 4 TOOL TOP VIEW BOTTOM VIEW 5 2 5 TOOL TOP VIEW BOTTOM VIEW 6 2 5 TOOL TOP VIEW BOTTOM VIEW ...

Page 61: ...LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 5 3 8 TOOL TOP VIEW BOTTOM VIEW 6 3 8 TOOL TOP VIEW BOTTOM VIEW 5 4 9 TOOL TOP VIEW BOTTOM VIEW 6 4 9 TOOL TOP VIEW BOTTOM VIEW ...

Page 62: ...CK MECHANISM DISASSEMBLY 1 Main Base 4 3 1 1 Clamp Assembly 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...

Page 63: ...ector 4 3 1 Locking Tabs 1 2 6 8 9 Gear Middle 1 2 6 8 10 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 2 Screw 1 2 7 12 13 14 15 18 Base M...

Page 64: ... 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 completely DECK M...

Page 65: ...rew 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 BASE PU RUBBER DAMPER RUBBER DAMPER RUBBER DAMPER Distinguish upper and lower sides Assemble with care Distinguish upper and lower sides Assemble with care GEAR RACK GENERAL PICK UP ASSEMBLY SPINDLE MOTOR ASSEMBLY S2 S2 S2 S2 FIG 4 3 ...

Page 66: ...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 it is locked by the Locking Tab L5 And confirm the Guide Up Down ...

Page 68: ...15 017 013 439 018 A02 A26 A01 001 002 003 014 015A 015B 016 020 435 A03 4 7 4 8 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only EXPLODED VIEW 1 DECK MECHANISM EXPLODED VIEW DP 12V ...

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