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Daewoo DV6T812N Service Manual
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Daewoo DV6T812N Service Manual

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S/M No. : VTB812NET0
Service Manual
MODEL: DV6T812N
DV6T512N
 Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
Nov. 2002

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Summary of Contents for Daewoo DV6T812N

  • Page 1 : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr Nov. 2002...
  • Page 2 CONTENTS SPECIFICATIONS........................2 ADVANTAGES OF THIS PRODUCT ..................3 TROUBLE SHOOTING ........................5 WAVEFORMS...........................23 CIRCUIT DIAGRAM .........................25 PCB CIRCUIT BOARD ........................31 INSTRUMENT DISASSEMBLY......................34 ELECTRICAL PARTSLIST ........................40...

  • Page 3: Specifications

    SPECIFICATIONS Power AC 120V, 60Hz Consumed electricity 24W (supplementary 2.5W) Weight 5.7kg Dimension (WxHxD) 430mmx91mmx355.5mm Operative temperature +5°C~35°C Installation condition Horizontal / Relative humidity under 80% Received channels VHF: 2-13 CH / UHF: 14-69 CH / Cable: 1-125 Signal type NTSC COLOR Antenna Input/output U/V-mixed: 75Ω...

  • Page 4: Advantages Of This Product

    ADVANTAGES OF THIS PRODUCT • DVD, VCD, CD, CD-R(MP3), CD-RW, VHS playback function • DVD one-touch record function • Watching DVD for recording broadcast • Integrated REMOTE (VCR, DVD) • Ultra power savings : less than 3W for stand-by mode •...
  • Page 5 ADVANTAGES OF THIS PRODUCT • Slow Forward / reverse (DVD) playback • Fast Forward / reverse playback • Search of title, chapter, and time in DVD disc, and search of track and time in VCD and CD • Various TV aspect (DVD) 4:3 for Pan and Scan, 4:3 for Letter Box, and 16:9 for Wide •...

  • Page 6: Trouble Shooting

    TROUBLESHOOTING 1. POWER CIRCUIT CAUTION You must use insulated transformer during the first part test of POWER circuit. No power Exchange POWER CORD POWER cord is ok? Is 200V~140V voltage Check F801. obtained at C805 +? Output voltage of 2 Check IC601,IC701.
  • Page 7 TROUBLESHOOTING 2. SYSTEM CIRCUIT A. LED DISPLAY No LED display. Is 5V obtained at IC701 Check R705, L601. pin #9, 25? Oscillation at IC701 pin #1? Exchange IC701. Specific GRID/SEG doesn’t function. GRID output at PORT of Check IC 701 pin #22~24, 27, IC701? 28, 30, 31.
  • Page 8 TROUBLESHOOTING B. No power compensation. No power compensation. Voltage of power fail (IC601 Check R625. pin#100) at micom is 0.7V over? More than 3.2V is maintained for 1 minutes at IC601 pin#37 Check RESET circuit. during Power Cord Open. Exchange IC601. C-1.
  • Page 9 TROUBLESHOOTING C-2. Bad playback quality (2) Noise appears on the Full Recheck step C-1 (Bad playback screen. playback quallty (1)). Are SW pulse and HA SW Are there SW, HA SW pulse at Check IC601. normal? IC601 pin #16, 18? Check PCB Pattern.
  • Page 10 TROUBLESHOOTING E. No CASSETTE Loading Cassette tape isn’t inserted. Is 5V voltage obtained at Check at ON/OFF 12. Loading parts IC604 pin#82? Check (D822, Q821). Is 13V voltage obtained at Check D851 and POWER circuit. Capstan Motor pin#8? Connect Capstan and Loading Motor. Is 12V voltage obtained at Each Check connector and Capstan Motor.
  • Page 11 TROUBLESHOOTING G. DRUM Motor stops DRUM Motor stops. Is 13V voltage obtained at Check ON/OFF 13V P603 pin#8? (D851, Q856). Is DRUM PWM fit to IC 601 Check DRUM PG/FG(IC 601 90). pin#76? Is 1.2V voltage obtained at Check R657, R658,C661,C668. P603 pin#12? Check Capstan Motor and DRUM Motor.

  • Page 12: Video Circuit

    TROUBLESHOOTING 3. VIDEO circuit A. EE screen doesn’t appear EE screen doesn’t appear. Is Video signal input at IC301 Check LINE JACK and IF circuit. pin#48,50,52,54? Check DVD circuit. Is 5V obtained at IC301 Check POWER 5V. pin#54, 42, 55, 72? Check IC301 Is signal output at IC301 pin #70,62,68,69.
  • Page 13 TROUBLESHOOTING B. Playback picture doesn’t appear Playback picture doesn’t appear. Is Envelope output at IC301 Is 5V obtained at IC301 Check POWER 5V. pin#79? pin#91? Is SW Pulse input at IC301 Check IC601 pin#18. pin#70? Check and Replace HEAD. Is Y signal output at IC301 Is 5V obtained at IC301 Check POWER 5V.
  • Page 14 TROUBLESHOOTING C. No recording No recording. Check EE MODE. Is FM signal output at IC301 Is signal input at IC301 pin# pin#78? 48, 50, 52, 54? Is 5V obtained at IC301 Check POWER circuit. pin#91? Check PB(H) circuit Is IC301 pin#80 PB(H) LOW? Is VIDEO SW Pulse input at Check IC601 pin#18.
  • Page 15 TROUBLESHOOTING D. No OSD(On Screen Display) appears No OSD appears. Is 5V obtained at IC601 pin# Check POWER circuit. 53, 98, 99? Is Video signal output at IC601 Is Video signal input at IC601 Replace IC601. pin#52? pin#50? Check IC 601. Check IC 601.
  • Page 16 TROUBLESHOOTING F. No DVD Video EE screen doesn’t appear Is signal output at P101 Check FFC CABLE & DVD pin# 13? Module Is signalat IC301 pin#54? Check PCB Pattern Remark previous 3-A No COMPONENT signal at JK102 Is signal output at P101 pin Check FFC CABLE &DVD #19,20,21? Module...
  • Page 17 TROUBLESHOOTING 4. AUDIO A. No sound in E-E mode A. a.1 RF E-E No sound in RF E-E mode Is 12V obtained at IC251 pin#34? Check POWER circuit. Is 5V obtained at IC251 pin#40? Is there Audio at IC251 pin#2, Check IC101 and RF101 3 in RF mode? Block(Ad2).
  • Page 18 TROUBLESHOOTING A. b. LINE1 E-E No sound in LINE1 E-E mode. Is 12V obtained at IC251 pin#34? Check POWER circuit. Is 5V obtained at IC251 pin#40? Is Audio signal at IC251 Check Input LINE1 pin#6, 7 in LINE1 mode? JACK Is Audio signal output at IC251 Are CLK and DATA obtained at Replace IC251...
  • Page 19 TROUBLESHOOTING A. c. LINE2 E-E No sound in LINE2 E-E mode. Is there Audio at IC252 Check Input LINE2 JACK. pin#4,11 in LINE2 mode? Is 12V obtained at IC252 Is LINE2 Audio signal output Check POWER circuit. pin#16? at IC252 pin#3,13? IC601 pin#20 is H? Check IC601.
  • Page 20 TROUBLESHOOTING A. d. DVD E-E No sound in DVD E-E mode. Is there DVD Audio at P101 Check DVD module. pin#1, 3? Is 12V obtained at ICD04 Check POWER circuit. pin#8? Is DVD Audio signal output Check ICD04. at ICD04 pin# 1,7? Is DVD signal output at IC601 pin#20 is L, Check IC601.
  • Page 21 TROUBLESHOOTING B. No Hi-Fi playback audio (PLAY MODE) Is the voltage at IC251 pin#44 Check DRUM connector over 3.2V ? and DRUM Is A.SW Signal input at IC251 Check A.SW at IC601 pin#19 pin#41? Is there Playback Audio signal Replace IC251. at IC251 pin#19,20? Is thereAudio at IC252 Check signal circuit IC251...
  • Page 22 TROUBLESHOOTING c. No HIFI playback in record/playback mode(REC MODE) Check IC101(MPX) Block. Check ICD04(DVD) Block Check Input LINE1 JACK. at IC251 pin#2, 3, 6, 7, 10, Check Input LINE2 JACK. 11, 8, 9. Check ICD02(DVD) Block. Is there Audio signal? REC 'H' BASE voltage at Check IC601 pin#22 Q201 is 5V?
  • Page 23 TROUBLESHOOTING E. No NORMAL AUDIO playback in record/playback mode(Check in REC mode) No Normal Audio playback in record/playback mode Check IC101(MPX) Block. Check ICD04(DVD) Block Check Input LINE1 JACK. at IC251 pin#2, 3, 6, 7, 10, Check Input LINE2 JACK. 11, 8, 9 Is there Audio signal? Check ICD02(DVD) Block.

  • Page 24: Waveforms

    WAVEFORMS 1. VIDEO SP IC301-88.89 3.0Vp-p EP IC301-94.95 2.2 Vp-p 1V/10msec/cm REC IC301 63 or 61 & IC302 14 IC301 63 or 61 & IC302 14 (IC604-3) (IC301 -70) (IC301 -70) 0.5/5msec/cm 0.5/5msec/cm SP PLAY/REC EP PLAY/REC...
  • Page 25 WAVEFORMS 2. AUDIO 2-1 AUDIO(Mono) P201-2 2-2 AUDIO(HI-Fl) Q901-collector...
  • Page 26 WAVEFORMS 3. SERVO/SYSCON (IC601-18) 5Vp-p (IC601-77) 5Vp-p (IC601-76) 5Vp-p (IC601-94) 3Vp-p 2V/5msec/cm sec/cm sec/cm 1V/5msec/cm REC/PLAY REC/PLAY REC/PLAY (IC601-97) 4.4Vp-p (IC601-90) 25Vp-p&5Vp-p (IC601-87) 2.5Vp-p (IC601-38) 2.6Vp-p 1V/5msec/cm 1V/5msec/cm 1V/0.2msec/cm 0.5V/0.1µ sec/cm PLAY REC/PLAY REC/PLAY REC/PLAY...

  • Page 27: Circuit Diagram

    CIRCUIT DIAGRAM 1. POWER SUPPLY SCHEMATIC DIAGRAM (DVD COMBO FREE)
  • Page 28 CIRCUIT DIAGRAM 2. VIDEO/AUDIO SCHEMATIC DIAGRAM(HI-FI)
  • Page 29 CIRCUIT DIAGRAM 3. SERVO & SYSCON SCHEMATIC DIAGRAM...
  • Page 30 CIRCUIT DIAGRAM 4. DIGITAL AUDIO SCHEMATIC DIAGRAM...
  • Page 31 CIRCUIT DIAGRAM 5. HI FI & SW CIRCUIT DIAGRAM...
  • Page 32 CIRCUIT DIAGRAM 6. INPUT/OUTPUT SCHEMATIC DIAGRAM...

  • Page 33: Pcb Circuit Board

    PCB CIRCUIT BOARD 1-1 . VCR (MAIN)
  • Page 34 PCB CIRCUIT BOARD 1-2. POWER...
  • Page 35 PCB CIRCUIT BOARD 1-3. LOGIC...

  • Page 36: Instrument Disassembly

    INSTRUMENT DISASSEMBLY 1. DECK DISASSEMBLY Perform all disassembly procedures in the order presented. When reassembling, use the reverse procedure. Make sure that all leads/ wiring are routed correctly when reassembling. A. LEG REMOVAL Remove 2 screws, then remove LEG FIG. 1 B.
  • Page 37 INSTRUMENT DISASSEMBLY C. PANEL FRONT DISASSEMBLY @ Remove 2 Hooks at left and right sides, Simultaneously, remove panel. ! Remove 3 Hooks at bottom FIG. 3 D. LOGIC PCB DISASSEMBLY Remove 7 Hooks, then remove Logic PCB FIG. 4...
  • Page 38 INSTRUMENT DISASSEMBLY E. DECK AND MAIN PARTS DISASSEMBLY ! Remove 6 screws, then remove DECK @ Remove 4 screws, then remove LOADER # Remove 3 screws, then remove POWER PCB FIG. 5...
  • Page 39 INSTRUMENT DISASSEMBLY F. MAIN PCB DISASSEMBLY @ Remove 1 screws, then remove MAIN PCB ! Remove 3 screws FIG. 6...
  • Page 40 INSTRUMENT DISASSEMBLY G. MAIN CHASSIS DISASSEMBLY ! Remove 6 screws, then remove MAIN CHASSIS FIG. 7...
  • Page 41 INSTRUMENT DISASSEMBLY H. Explode view...

  • Page 42: Electrical Partslist

    CORD POWER AS USA KKP-10W YH396 BHF-1528F C246 HCBK122KBA C CHIP CERA 50V X7R 1200PF K 1608 Z001 PVMPMSN645 PCB MAIN AS DV6T812N-QJ C247 HCBK122KBA C CHIP CERA 50V X7R 1200PF K 1608 IC603 14SEK24D08 IC EEPROM S-24C08ADP-01(8K DIP) C253...
  • Page 43 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C622 HCBK223KBA C CHIP CERA 50V X7R 0.022MF K 1608 R203 HRFS334JBA R CHIP 1/16 330K OHM J 1608 C624 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608 R204 HRFS201JBA R CHIP 1/16 200 OHM J 1608...
  • Page 44 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R292 HRFS201JBA R CHIP 1/16 200 OHM J 1608 R654 HRFS103JBA R CHIP 1/16 10K OHM J 1608 R293 HRFS201JBA R CHIP 1/16 200 OHM J 1608 R655 HRFS103JBA R CHIP 1/16 10K OHM J 1608 R294 HRFS133JBA...
  • Page 45 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C108 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 C303 CEXF1H109A C ELECTRO 50V RSM 1MF (4X7) TP C115 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 C304 CEXF1H109A C ELECTRO 50V RSM 1MF (4X7) TP C120 CEXF1C331V C ELECTRO...
  • Page 46 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK L110 5CPX688K2T COIL PEAKING 0.68UH(BLU-SILV) C103 CBZP1C103M C CERA SEMI 16V Y5S 0.01MF M (AXIAL) L201 5CPX680J2T COIL PEAKING 68UH(BLU-BLK) C106 CBZF1E223Z C CERA SEMI 25V Y5V 0.022MF Z L202 5CPX680J2T COIL PEAKING 68UH(BLU-BLK)
  • Page 47 U001 97P65319MA PCB MAIN 330*246*1.6T R262 RD-AZ680J- R CARBON FILM 1/6 68 OHM J Z003 PVLAMSN645 PCB LOGIC MANUAL AS DV6T812N-QJ R263 RD-AZ242J- R CARBON FILM 1/6 2.4K OHM J D702 DPL0A434G- LED LAMP PL0A434G ORANGE BULK R264 RD-AZ680J- R CARBON FILM...
  • Page 48 97P65319UA PCB UNION 330*246*1.6T/3 C831 CMXL1J104K C MYLAR MEU 63V 0.1MF K Z800 PVPWMSN645 PCB POWER MANUAL AS DV6T812N-QJ C833 CEXF1E221V C ELECTRO 25V RSS 220MF (8X11.5) TP C801 CL2EE3104M C LINE ACROSS AC 275V 0.1MF M PCX2 335M C834...

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