LG DK676X Service Manual Download Page 1

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DVD VIDEO PLAYER

SERVICE MANUAL

MODEL : DK676X/DK677X

MODE

: DK676X/DK677X

SER

VICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

Summary of Contents for DK676X

Page 1: ...DVD VIDEO PLAYER SERVICE MANUAL MODEL DK676X DK677X MODEL DK676X DK677X SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

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

Page 3: ...CT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 General Servicing Precautions Insulation Checking Prodedure Electrostatically Sensitive Devices SERVICE INFORMATION FOR EEPROM 1 5 SPECIFICATIONS 1 6 1 2 ...

Page 4: ...AYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC OPERA TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC TURE TUBE OR HIGH VOLTAGE SUPPLY AND UNDER CERTAIN CIR CUMSTANCES MAY PRODUCE RADIATION IN EXCESS OF DESIR ABLE LEVELS 2 ONLY FACTORY SPECIFIED C R T ANODE CONNECTORS MUST BE USED DEGAUSSING SHIELDS ALSO SERVE AS X RAY SHIELD...

Page 5: ... pan els 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 u...

Page 6: ...gative RCA jack x 1 SCART TO TV COMPONENT VIDEO OUT Y 1 0 V p p 75 Ω negative sync RCA jack x 1 Pb Pr 0 7 V p p 75 Ω RCA jack x 2 AUDIO OUT 2 0 Vrms 1 KHz 0 dB 600 Ω RCA jack L R x 1 SCART TO TV DIGITAL OUT COAXIAL 0 5 V p p 75 Ω RCA jack x 1 DIGITAL OUT OPTICAL 3 V p p 75 Ω Optical jack x 1 OPTIONAL SYSTEM Laser Semiconductor laser wavelength 650 nm Signal system PAL NTSC Frequency response DVD P...

Page 7: ...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 10 2 3 3 Packing Accessory Section 2 4 ...

Page 8: ...0 463 463 465 465 463 463 250 463 463 467 260 261 261 300 320 463 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 KARAOKE MODEL ONLY A41 276 OPTIONAL PART KARAOKE MODEL ONLY 279 A 5 4 3 2 1 B C D ...

Page 9: ...2 Deck Mechanism Section DP 10 2 3 001 002 003 020 439 018 013 017 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 ...

Page 10: ...n BATTERY 808 PACKING SHEET 804 PACKING OPTIONAL PARTS 803 806 820 OWNER S MANUAL RF CABLE 810 CABLE SET ASS Y 801 REMOCON 900 BOX CARTON 802 PACKING 803 811 812 PLUG ASS Y 1WAY YELLOW PLUG ASS Y 1WAY BLACK PLUG ASS Y 2WAY 832 DISC ...

Page 11: ...EFORM 3 20 13 AUDIO OUTPUT FROM AUDIO MT1389E 3 21 BLOCK DIAGRAMS 3 22 1 OVERALL BLOCK DIAGRAM 3 22 2 POWER SMPS BLOCK DIAGRAM 3 23 3 SERVO BLOCK DIAGRAM 3 24 4 MPEG MEMORY BLOCK DIAGRAM 3 25 5 VIDEO AUDIO BLOCK DIAGRAM 3 26 CIRCUIT DIAGRAMS 3 27 1 POWER SMPS CIRCUIT DIAGRAM 3 27 2 SYSTEM CIRCUIT DIAGRAM 3 29 3 SERVO CIRCUIT DIAGRAM 3 31 4 AV JACKCIRCUIT DIAGRAM 3 33 5 TIMER CIRCUIT DIAGRAM 3 TOOL...

Page 12: ...ES YES YES YES YES Is the D121 normal YES YES Is there about 2 5V at the IC103 Pin1 Is the D123 normal Is the D125 Normal Power Line of Main PCB DVD is short No 12V Check or Replace the D125 Is the Vcc 14V sup plied to Q123 Collector Check or Replace the Q123 Is the Vcc 12V sup plied to Q126 Base NO NO Check the PWR CTL H signal from µ com YES YES YES No REG 5 0V Check or Replace the D123 Is the V...

Page 13: ...ed Tray Close to Closed position 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 2 System operation flow ...

Page 14: ... YES Is 3 3V and 1 8V DC outputs normal on main PCBA YES Connect to PC RS232 Cable and update the FLASH memory code YES Update FLASH successfully YES A Replace power PCBA or AC transformer NO Repair or Replace Power PCBA NO Check the regulators or related diodes NO 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 Me...

Page 15: ...AM MT1389E and the SDRAM is damaged NO MT1389E VIDEO outputs properly Check the related circuit of MT1389E NO Have TV signal output Check AV cable connection to TV set Normal TROUT TRIN signals Check the filtering and amp circuit of TV signal NO Check the load OPEN CLOSE switch NO Normal TRCLOSE TROPEN signal Check the Tray control IO pins on MT1389E AM5869S NO Normal LOAD LOAD signal Check the ca...

Page 16: ...Check the connection line of STBY signal NO Is FMSO DC Level higher than 1 4V Check the related circuit of FMSO NO SL and SL output properly YES Check the amp circuit on motor driver Check FOSO connection on MT1389E and motor dirver NO NO Check the cable connection with MECHA Proper FOSO outputs to motor driver Proper F F outputs Check the amp circuit on motor dirver NO Check cable connect on with...

Page 17: ...ansistor is OK Check the related circuit on laser power transistor NO Check cable connection between transistor ouput and pick up head YES YES YES Check the related circuit on MT1389E RFL signal Check DMSO related circuit on MT1389E NO NO Check the spindle control amp circuit of motor driver NO Laser off Proper RFL signal on MT1389E Check LDO1 LDO2 signal Proper DMSO signal on MT1389E SP SP output...

Page 18: ...heck the FOSO connection on MT1389E and motor driver NO Check FOSO signal on MT1389E YES YES Check the TRSO connection on MT1389E and motor dirver NO Check the tracking control amp circuit on motor driver NO Normal TEO Signal on MT1389E NO Check the related circuit on MT1389E Properly TRSO signal on MT1389E T T output properly Check cable connection on pick up head Check RFO RFLVL signal waveform ...

Page 19: ...ST END NO NO YES YES YES YES Check connection between MT1389E Audio AMP IC NO Normal Audio AMP IC out YES Check the related circuit of Audio AMP IC NO Check Audio filter mute circuit Communications between IR VFD Front pannel key MT1389E is normally NO Check communication lines on MT1389E Check the cable connection on Front pannel ...

Page 20: ...C801 pin3 Is the Mic signal at the IC801 Pin 2 Is the Mic signal at the IC801 Pins3 7 normal Does the Mic signal input the IC601 Pin224 Replace IC601 Check pattern Replace the VR801 Replace IC801 Replace the mic jack Start Insert the Mic jack NO NO NO NO YES YES YES ...

Page 21: ...S AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 MT1389E main clock is at 27MHz X601 FIG 1 1 1 0V 27MHz 2 MT1389 reset is low active FIG 1 2 Reset Time 3 3VA PWR_CTL RESET ...

Page 22: ...3 12 3 RS232 waveform during procedure Downloading FIG 1 3 TXD RXD 4 Flash R W enable signal during download Downloading FIG 1 4 PRD PWR ...

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

Page 24: ...OL RELATED SIGNAL NO DISC CONDITION FIG 4 1 5 LENS CONTROL RELATED SIGNAL NO DISC CONDITION FIG 5 1 FOSO 1 5V 1 4V 1 3V F 3 2V 2 7V 2 2V F 3 2V 2 7V 2 2V FMSO 1 9V 1 4V 1 1V STBY 3 3V SL 4 2V 2 8V 1 2V SL 4 2V 2 8V 1 5V ...

Page 25: ...3 15 6 LASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION FIG 7 2 DVD 7 DISC TYPE JUDGEMENT WAVEFORM FIG 7 1 DCLK 128MHz Vp p 2 2 Vmax 2 7V F FE RFL MDI1 0V 180mV LD01 3 3V 2 3V LD02 3 3V 2 3V ...

Page 26: ...3 16 FIG 7 2 DVD FIG 7 3 CD F F FE FE RFL RFL ...

Page 27: ...3 17 FIG 7 4 CD 8 FOCUS ON WAVEFORM FIG 8 1 DVD FE FOSO F F F FE RFL ...

Page 28: ...3 18 FIG 8 2 CD 9 SPINDLE CONTROL WAVEFORM NO DISC CONDITION FIG 9 1 FOSO F DMSO 1 4V 1 8V SP 3 6V 2 4V SP 3 6V 4 8V FE F ...

Page 29: ...3 19 10 TRACKING CONTROL RELATED SIGNAL System checking FIG 10 1 DVD FIG 10 2 CD TE TRSO T T TE TRSO T T ...

Page 30: ...3 20 11 MT1389E AUDIO OPTICAL AND COAXIAL OUTPUT SPDIF FIG 11 1 12 MT1389E VIDEO OUTPUT WAVEFORM 1 100 FIG 12 1 TE TRSO T T ...

Page 31: ...3 21 2 COMPOSITE VIDEO SIGNAL FIG 12 2 13 AUDIO OUTPUT FROM AUDIO MT1389E FIG 13 1 ...

Page 32: ...TRIN TROPEN TRSO FOSO DMSO FMSO AD 0 7 V1P4 MDI1 APC AUDIO_L CN503 RS232 TXD RXD SCL 3 3VA IC503 M12L64164A SDRAM MA 00 10 BA0 DCLK DCKE CS RAS CAS WE DQM 0 1 MA11 BA1 SDA IC501 MT1389E DSP MPEG RF 12V 5V 3 3VA R L POWER BOARD 8V MGND 5V 12V AGND 3 3VA DGND PWR_CTL B Pb R Pr G Y PICKSEL IC508 CS5331A IC509 KA741 KARAOKE JACK ACL K AB CLK AL R CK AMDAT R L MIC_ON MIC_IN KARAOKE OP TION MUTE AUDIO_R...

Page 33: ...3 23 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 6VA M RECTIFIER 3 3V LPF AC100 240V RECTIFIER MT1389E ...

Page 34: ...RF CD A B C D E F RF PICKSEL SP SP IC501 MT1389E ONE CHIP Sled_s Focus_s Track_s Spindle_s DRVSB OPEN CLOSE FACT FACT TACT TACT SLED SLED CDLD DVDLD VC 2 1V CDMD DVDMD CD_DVD SW INSW OUTSW HOMESW SPDL_SENS ALPC DISC M D MT1389E 3 SERVO BLOCK DIAGRAM ...

Page 35: ...01 LD02 IOA V2 0 LIMIT TROUT TRIN TROPEN TRSO FOSO DMSO FMSO AD 0 7 V1P4 AUDIO_L CN503 RS232 SCL IC503 M12L64164A SDRAM MA 00 10 BA0 DCLK DCKE CS RAS CAS WE DQM 0 1 MA11 BA1 SDA PICK_SEL AMDAT MIC_ON MUTE AUDIO_R ADATA1 ADATA2 ADATA3 FRONT BLOCK CLK DIN DOUT SERVO BLOCK AUDIO BLOCK 2Channel 5 1Channel ASPDIF VIDEO BLOCK CVBS COMPONENT CVBS KARAOKE BLOCK SCART VGA BLOCK MT1389E IC501 MT1389E DSP MP...

Page 36: ...b_in Cy_in CYout Cbout Crout Y Pb Pr SC SUPER CVBS pin 164 Y1IN YOUT CVBSOUT KA741 Amp MIC IN Karaoke R G B H_SYNC V_SYNC VGA option CS5331A ADC DAC CS4360 AMP S4580 AMP S4580 ASDAT0 ASDAT1 ASDAT2 FRONT L REAR R REAR L CENTER 5 1 CH AMP S4580 Optical ASPDIF Pin159 Analog signal MC4580 Amp Pin184 186 Scart R G B MUTE MT1389E ...

Page 37: ...NTIL THE NEW SERVICE LITERATURE IS PRINTED NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmeter during Play mode A B C D E F G H I J K L M N O P Q R S T 14VA No Power D125 is Defective 12V No Power Q123 is Defective 5 0V No Power Q126 is Defective 5 6V No Power Q125 is Defective 3 3V No Power Q121 is Defective 3 3VA...

Page 38: ...3 29 3 30 2 SYSTEM CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 39: ...3 31 3 32 A B C D E F G H I J K L M N O P Q R S T 3 SERVO CIRCUIT DIAGRAM ...

Page 40: ...3 33 3 34 4 AV JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Page 41: ...3 35 3 36 5 TIMER CIRCUIT DIAGRAM 3 TOOL ONLY A B C D E F G H I J K L M N O P Q R S T ...

Page 42: ...3 37 3 38 6 TIMER CIRCUIT DIAGRAM 4 TOOL ONLY A B C D E F G H I J K L M N O P Q R S T ...

Page 43: ...3 39 3 40 7 TIMER CIRCUIT DIAGRAM 6 TOOL ONLY A B C D E F G H I J K L M N O P Q R S T ...

Page 44: ...3 41 3 42 8 TIMER CIRCUIT DIAGRAM 7 TOOL ONLY A B C D E F G H I J K L M N O P Q R S T ...

Page 45: ...3 43 3 44 9 TIMER CIRCUIT DIAGRAM 8 TOOL ONLY A B C D E F G H I J K L M N O P Q R S T ...

Page 46: ...3 45 3 46 10 KARAOKE CIRCUIT DIAGRAM KARAOKE MODEL ONLY A B C D E F G H I J K L M N O P Q R S T ...

Page 47: ... 139 0 024 0 048 140 0 024 1 39 141 0 042 1 12 142 1 22 1 56 143 1 463 0 998 144 1 152 0 145 0 99 3 274 146 1 763 0 147 2 551 3 259 148 0 0 149 0 0 150 3 312 0 151 0 0 152 0 1 232 153 0 1 232 154 0 1 236 155 0 0 156 0 0 035 157 0 1 609 158 0 0 159 1 610 0 160 3 282 3 268 161 1 229 1 208 162 1 234 1 208 163 0 0 164 0 47 0 38 165 3 28 3 269 166 0 0 167 3 281 3 267 168 0 418 0 331 169 0 0 294 170 0 5...

Page 48: ...3 49 3 50 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 49: ... LOCATION GUIDE 4 TOOL TOP VIEW LOCATION GUIDE 4 TOOL BOTTOM VIEW LOCATION GUIDE 6 TOOL TOP VIEW LOCATION GUIDE 6 TOOL BOTTOM VIEW LOCATION GUIDE 3 TOOL TOP VIEW LOCATION GUIDE 3 TOOL BOTTOM VIEW LOCATION GUIDE 3 TOOL TOP VIEW LOCATION GUIDE 3 TOOL BOTTOM VIEW LOCATION GUIDE 3 TOOL 4 TOOL 6 TOOL 7 TOOL 8 TOOL ...

Page 50: ...3 53 3 54 4 SMPS P C BOARD 360mm ONLY 5 SMPS P C BOARD 430mm ONLY LOCATION GUIDE 7 KARAOKE P C BOARD KARAOKE MODEL ONLY LOCATION GUIDE 6 JACK P C BOARD OPTIONAL PART LOCATION GUIDE ...

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