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Normal IR.VFD & Front
pannel key functions?

Communications between

IR.VFD Front pannelkey & MT1389

is normally?

Check communication lines on

MT1389.

NO

YES

Check the cable connection on

Front pannel.

TEST END

YES

Normal Audio output
when disc playback?

Audio PWM IC received

correct data stream?

Check connection between MT1379

& Audio PWM IC.

Normal Audio PWM IC

out?

Check the related

circuit of Audio PWM IC.

Check Audio filter,amplify,mute

circuit.

NO

NO

NO

YES

YES

YES

E

NO

www.freeservicemanuals.info

2/10/2016

Published in Heiloo, Holland

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Summary of Contents for LGDVT418

Page 1: ...DVD CD RECEIVER SERVICE MANUAL P N 3829RDT044U AUGUST 2004 MODEL LGDVT418 SERVICE MANUAL MODEL LGDVT418 CD R RW www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 2: ...RAMS 2 7 WIRNG DIAGRAMS 2 21 PRINTED CIRCUIT DIARGAMS 2 23 SECTION 3 DVD PART DVD PART ELECTRICAL TROUBLESHOOTING GUIDE 3 1 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 3 8 BLOCK DIAGRAM 3 21 DVD PART SCHEMATIC DIAGRAMS 3 25 SECTION 4 EXPLODED VIEWS 4 1 SECTION 5 SPEAKER PART 5 1 SECTION 6 REPLACEMENT PARTS LIST 6 1 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 3: ...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 cleaning the lens surface therefore a cotto...

Page 4: ... disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench 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 ...

Page 5: ...evices 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 comparable conductive materials 7 Immediat...

Page 6: ... 1 5 SPECIFICATIONS www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 7: ... 1 6 MEMO www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 8: ...INITIAL READ WORK DOES IT PLAY YES NO YES YES OK NO YES NO NO CHECK POWER SUPPLY CIRCUIT CHECK LASER CIRCUIT CHECK TRACKING SERVO CIRCUIT TURN POWER ON CHECK FOCUS CIRCUIT CHECK DISC DOES IT OUTPUT AUDIO YES NO CHECK AUDIO CIRCUIT 1 Power check flow SECTION 2 AUDIO PART www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 9: ... Check if IC101 PIN 17 46 72 90 is high 5V Check if IC101 PIN26 is High Replace IC101 Does CD DVD appear at FLD Reconnet it Refer to SMPS OK Refer to oscillator Circuit Check DVD Reset Waveform Check IC101 Reset Wavefrom Check 5V line Check Power dection Circuit Does LOADING appear at FLD Does no Disc or Time appear at FLD Check if DVD an Audio Micom Interface is OK Check power Check DVD Module Ch...

Page 10: ... 2 3 3 FRONT CIRCUIT 1 2 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 11: ... 2 4 4 FRONT CIRCUIT 2 2 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 12: ... BLOCK DIAGRAM 2 5 2 6 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 13: ...2 7 2 8 SCHEMATIC DIAGRAMS FRONT SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 14: ...2 9 2 10 MICOM SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 15: ...2 11 2 12 I O SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 16: ...2 13 2 14 DSP SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 17: ...2 15 2 16 AMP SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 18: ...2 17 2 18 SMPS WIDE SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 19: ...2 19 2 20 POWER SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 20: ...2 21 2 22 WIRING DIAGRAMS www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 21: ...2 23 2 24 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD COMPONENT SIDE www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 22: ...2 25 2 26 MAIN P C BOARD SOLDER SIDE www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 23: ...2 27 2 28 FRONT P C BOARD SOLDER SIDE FRONT P C BOARD COMPONENT SIDE www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 24: ...2 29 2 30 POWER P C BOARD www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 25: ...2 31 2 32 MEMO MEMO www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 26: ... 3 1 1 Power check flow ELECTRICAL TROUBLESHOOTING GUIDE SECTION 3 DVD PART www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 27: ...ED at Inner Side SLED Moves to Inner Positi on NO YES YES Reci eve OPEN CLOSE Key 1 Execute Pressed Key IR Key 2 System operation Routine Loop NO 1 Stop Playback Open Tray 2 Display tray open message LOGO Receive CLOSE Key NO YES YES 1 Judge whether have disc and disc type 2 Jump to related disc reading procedure www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 28: ...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 NO YES Connect to PC RS232 Cable and update the FLASH memory code Update FLASH successfully A YES 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 Memory related circuit www freeservicem...

Page 29: ...perly Check the related circuit of MT1389 Have TV signal output 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 Normal TROUT TRIN signals Check the load OPEN CLOSE switch Normal TRCLOSE TROPEN signal Normal LOAD LOADsignal Check the cable connection between main PCBA and loader Check the Tray control IO pi...

Page 30: ...cuit of FMSO SL and SL output properly Check the amp circuit on motor driver Check the cable connection with MECHA Do not put in disc and tray close C Optical Lens has movements for searching Focus Proper FOSO outputs to motor driver Check FOSO connection on MT1389 and motor dirver Proper F F outputs Check the amp circuit on motor dirver Check cable connect on with pick up head www freeservicemanu...

Page 31: ...NO NO YES NO YES YES NO LD01 or LD02 output properly Check the laser power circuit on MT1336 and connecting to power transistor Collector voltage of power transistor is OK Check the related circuit on laser power transistor Check cable connection between transistor ouput and pick up head Put disc in Laser off Disc ID is correct Proper RFL signal on MT1389 Check the related circuit on MT1389 RFL si...

Page 32: ... the tracking control amp circuit on motor driver Check cable connection on pick up head Disc is play Check RFO RFLVL signal waveform NO NO YES YES YES Focus ON OK Proper signals on A B C D of MT1389 Check connections between MT1389 and pick up head Check FEO signal on MT1389 Check FOSO signal on MT1389 Check the FOSO connection on MT1389 and motor driver YES NO www freeservicemanuals info 2 10 20...

Page 33: ...able connection on Front pannel TEST END YES Normal Audio output when disc playback Audio PWM IC received correct data stream Check connection between MT1379 Audio PWM IC Normal Audio PWM IC out Check the related circuit of Audio PWM IC Check Audio filter amplify mute circuit NO NO NO YES YES YES E NO www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 34: ...TAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 MT1379 main clock is at 27MHz X501 2 MT1336 reset is high active www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 35: ... 3 10 FIG 1 3 FIG 1 4 3 RS232 waveform during procedure Downloading 4 Flash R W enable signal during download Downloading www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 36: ... 3 11 FIG 2 1 FIG 3 1 2 SDRAM CLOCK 1 MT1379 main clock is at 27MHz X501 3 TRAY OPEN CLOSE SIGNAL www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 37: ... 3 12 FIG 4 1 FIG 5 1 4 SLED CONTROL RELATED SIGNAL NO DISC CONDITION 5 LENS CONTROL RELATED SIGNAL NO DISC CONDITION www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 38: ... 3 13 FIG 6 1 FIG 7 1 6 LASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION 7 DISC TYPE JUDGEMENT W VEFORM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 39: ... 3 14 FIG 7 2 DVD FIG 7 3 CD www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 40: ... 3 15 FIG 7 4 CD FIG 8 1 DVD 8 FOCUS ON W VEFORM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 41: ... 3 16 FIG 8 2 CD FIG 9 1 9 SPINDLE CONTROL W VEFORM NO DISC CONDITION www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 42: ... 3 17 10 TRACKING CONTROL RELATED SIGNAL System checking FIG 10 1 DVD FIG 10 2 CD www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 43: ... 3 18 FIG 11 1 DVD FIG 12 1 11 MT1389 AUDIO OPTICAL AND COAXIAL INPUT SPDIF 12 MT1389 VIDEO OUTPUT WAVEFORM 1 100 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 44: ... 3 19 ADAT0 3 FIG 12 2 FIG 13 1 2 COMPOSITE VIDEO SIGNAL 13 MT1389 AUDIO OUTPUT TO PWM IC www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 45: ... 3 20 FIG 14 1 14 AUDIO OUTPUT FROM PWM IC www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 46: ...D VD18 VD33 3V3M IC605 MM1623XFBE VIDEO BUFFER RS232_TXD IECDAOUT COAXIAL SPDIF D2_T 1 3 SCART_16 9 RGB_SEL 3V3M CDLD DVDLD SVREF21 5V 8V HOMESW INSW OUTSW ROMDATA 0 7 5 2VA IC101 AUDIO MICOM M_REQ POWER BOARD VFD_RXD S_REQ 5 2VA 8V DMUTE IIC VFD DAC_SCK IC603 4M 16BIT 4Bank SDRAM VD33D MA 00 11 DMCLK CSJ BA0 BA1 DQM WEJ CASJ RASJ IIC VFD DAC_TXD IC601 MTK MT1389 12V 12V 5V YC_MIX VIDEO_SW SER 0 2...

Page 47: ... LOAD LOAD LD0 1 LDO 2 IOA MDI 1 ALPC V20 PICKSEL LIMIT TRIN TROUT TRCLOSE STBY V1P4 IC603 4M x 16bit SDRAM MA 0 11 DQM0 DQM1 WE CAS RAS CS BA0 BA1 SDCLK SDCKE DQ 0 15 FLASH ROM PRD PWR PCE AD 0 7 A 0 20 EEP ROM SCL SDA RS232C MTK RXD TXD X501 27MHz X TAL IC601 MT1389 DVDPLAYER ONE CHIP www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 48: ...M IC603 SDRAM 64M DCLK WE CAS RAS CS DCKE MA 0 10 DQM0 DQM1 DQ 0 15 X501 27MHz SCL SDA Y2 Y Y3 Color Y4 Y Y5 Cb Y6 Cr ASPECT 16 9 ACLK ALRCK ABCK MUTE VSCK VSDA ASDTA 0 3 ASTB SCL SDA ASPDIF PWR PCE PRD A 0 20 AD 0 7 VFD_SCK VFD_TXD M_REQ SCKO TXDO M REQ URST S_REQ VFD_RXD www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 49: ...IC303 Digital POWER IC IC304 Digital POWER IC CVBS COMPONENT R G B Y Pb Pr SUPER VIDEO Y C R G B Y Pb Pr Y C DAC RESET ACLK SCL SDA DAC RESET ACLK SCL SDA ADATA1 ADATA2 ADATA3 A V JACK MPEG MPEG MPEG 5 1CH BOARD FRONT R REAR R FRONT L REAR L CENTER WOOFER AUDIO L AUDIO R ADATA3 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 50: ...3 25 3 26 DVD PART SCHEMATIC DIAGRAMS MPEG SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 51: ...3 27 3 28 SERVO SCHEMATIC DIAGRAM www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 52: ...CTION A50 250 305 263 A47 262 A44 260 261 285 280 284 281 A26 322 A46 TU101 288 A43A 283 282 A43 NOTE Refer to SECTION 6 REPLACEMENT PARTS LIST in order to look for the part number of each part www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 53: ...4 3 4 4 DECK MECHANISM EXPLODED VIEW www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 54: ... 5 1 SECTION 5 SPEAKER PART MODEL LHS T6749W 658 659 654 657 656 655 656 655 650 651 652 656 653 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 55: ... 5 2 MODEL LHS T6749C 755 756 757 755 759 758 751 750 752 754 753 752 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 56: ... 5 3 MODEL LHS T6749T 863 864 867 865 866 857 858 861 856 860 859 862 853 855 854 853 852 850 851 www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

Page 57: ... 5 4 MEMO www freeservicemanuals info 2 10 2016 Published in Heiloo Holland ...

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