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Daewoo DTQ-26S1FC Service Manual

Color television
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Service Manual

CHASSIS
NTSC-M SYSTEM
:
MODEL
DAEWOO ELECTRONICS CO., LTD.
OVERSEAS SERVICE DEPT.
Color Television
:
CN-200I/A
DTQ-26S1FC/FS/FSP(CN-200I)
DTQ-29S1FCN/FSN/FSP(CN-200I)
DTQ-26S1HC/HS/HSP(CN-200A)
DTQ-29S1HC/HS/HSP(CN-200A)

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Summary of Contents for Daewoo DTQ-26S1FC

  • Page 1: Service Manual

    Service Manual Color Television CHASSIS CN-200I/A NTSC-M SYSTEM MODEL DTQ-26S1FC/FS/FSP(CN-200I) DTQ-29S1FCN/FSN/FSP(CN-200I) DTQ-26S1HC/HS/HSP(CN-200A) DTQ-29S1HC/HS/HSP(CN-200A) DAEWOO ELECTRONICS CO., LTD. OVERSEAS SERVICE DEPT.

  • Page 2: Electrical Specifications

    FEATURES FS (Frequency Synthesizer) Tuning System CATV Ready Monitor Look Design A/V IN. (Stereo) Stereo/Mono Function ELECTRICAL SPECIFICATIONS POWER INPUT FC SERIES AC 120V 60Hz FS SERIES AC 85V ~ AC 150V 60Hz FSP SERIES AC 220V 50Hz/60Hz POWER RATING 26”...
  • Page 3 CONTROL VIEW F-CONNECTOR 300 OHM-75 OHM COUPLING TRANSFORMER 75Ω FROM 75 OHM VHF ANTENNA WITH CABLE OR CABLE TV SYSTEM...
  • Page 4 1. Overview of Your Equipment Your TV comes with a remote control. The section below summarizes the buttons,controls, and terminals that you will use with your TV. 2. Your TV' s Front Panel 1. POWER Use this buttom to turn your TV on or off. Use these buttom to change channels on your TV, or to select items in the menu system.
  • Page 5 BLOCK DIAGRAM (CN-200I)
  • Page 6 BLOCK DIAGRAM (CN-200A)
  • Page 7 GENERAL ADJUSTMENTS 1. GENERAL clockwise.) 4) Rotate the RED, GREEN and BLUE BIAS controls (R917, In the majority of cases, all color televisions will need only R918, R919) counterclock wise from the maximum, set slight touch-up adjustment upon installation. Check the basic them to the position where notches in the knobs become characteristics such as height, focus and sub- basic parallel to the surface of P.C.
  • Page 8 10. PICTURE IF/AFT ADJUSTMENTS NOTE : THIS RECEIVER IS TRANSISTORIZED AND SPECIAL CARE MUST BE TAKEN WHEN SERVICING. READ THE FOLLOWING (NOTES BEFORE ATTEMPTING ALIGNMENT) Alignment requires an exacting procedure and should be undertaken only when necessary. Isolation transformer must be used to prevent shock hazard. The test equipment specified or its equivalent is required to perform the alignment properly.

  • Page 9: Trouble Shooting Charts

    TROUBLE SHOOTING CHARTS NO POWER GO TO DOES QC701(POWER ON/OFF TR) OPERATE? GO TO CHECK (7.5V R816 15K 2WATT DOES SHUT DOWN CIRCUIT OPERATE? I501 103V CHECK TP10 (MAIN B+ LINE) IF #26 NORMAL & NO OUTPUT AT #23 THEN Q402 CHANGE I501 H.
  • Page 10 NO PICTURE CHECK THE WAVE FORM OF GO TO I501 #44 (2Vp-p) GO TO COMPOSITE VIDEO INPUT I501 LA 7674 QC501 Y-OUT VIDEO DRIVE QC201 C506 CONTRAST CHECK 210V CHECK BRIGHT KINE CONTROL H. BLANKING (NORMAL) 11 14 VOLTAGES T402 #39: 5.0V D404 R522...
  • Page 11 NO SOUND(CN-200I) GO TO CHECK FOR SIGNAL AT I501 #1 GO TO CHECK MONO 100% MOD -> 0.424 Vp-p #2 9V (B+) I601 CHECK 1Vp-p CHECK EXT SOUND MUTE ON: 5V (MUTE) SIGNAL OFF:L OFF: 0V #1 9V (B+) CHECK 1Vp-p #2(0~5V) I602 #8(0~5V)
  • Page 12 NO SOUND(CN-200A) GO TO CHECK FOR SIGNAL AT I501 #1 GO TO CHECK 4.5V #30 9V (B+) CHECK MONO 100% MOD #2(9VDC) -> 0.693 Vp-p IM601 L OUT CHECK R/L OUTPUT R OUT CHECK 4.5V MUTE ON: 5V (MUTE) OFF: 0V #1 9V (B+) CHECK 1Vp-p...
  • Page 13 CH DON'T STOP GO TO GOOD CHECK INPUT SIGNAL CONDITIONS LOSS OF SIGNAL OR WEAK SIGNAL IF OUTPUT I501 8, 9 U101 LA7674 TUNER CHECK ADJUST AFT WINDOW RF AGC VTG. R113 1.6V ~ 3.4V I701 LC864616A ADJUST PIF & AFT REFER TO GENERAL ADJUSTMENTS L: NO SIGNAL...
  • Page 14 NO COLOR CHECK CENTER 3.5V TINT APC FILTER COLOR X502 CENTER I501 CHECK LA7674 CRYSTAL 3.579545MHZ CHECK COMPOSITE C506 VIDEO Q901 Q902 QC201 Emitter Q903 LUMINANCE (-Y) VIDEO B (210V) CHECK CONNECTOR P901 NO VERTICAL DEFLECTION CHECK 9V CHECK 9V CHECK VERT.OUT I501...

  • Page 15: Remote Control Does Not Operate

    ON SCREEN DISPLAY DOES NOT OPERATE CHECK FOR,60Hz / VS R, G, B, BL CHANGE / HS I701 IF OSD DOES NOT OPERATE, CHANGE I701 CHECK FOR, 15, 734Hz OSC CHECK REMOTE CONTROL DOES NOT OPERATE IL01 REMOCON SENSOR GND 5V OUT CHECK WAVE- FORM...
  • Page 16 PIN ASSIGN OF IC LC864616A(I701) 1 P10 P07 42 POWER(O) VIDEO MUTE(O) KEY OUT 2 P11 DATA(O) KEY OUT CLOCK(O) 3 P12 KEY OUT ENABLE(O) 4 P13 KEY IN 3-LAN TV/VID 5 P14 SOUND MUTE(O) KEY IN TV/VIDEO(O) 6 P15 MN/ST EEPROM KEY IN...

  • Page 17: No Power

    TROUBLE SHOOTING CHARTS NO POWER GO TO DOES QC701(POWER ON/OFF TR) OPERATE? GO TO CHECK (7.5V R816 15K 2WATT DOES SHUT DOWN CIRCUIT OPERATE? I501 103V CHECK TP10 (MAIN B+ LINE) IF #26 NORMAL & NO OUTPUT AT #23 THEN Q402 CHANGE I501 H.
  • Page 18 NO PICTURE CHECK THE WAVE FORM OF GO TO I501 #44 (2Vp-p) GO TO COMPOSITE VIDEO INPUT I501 LA 7674 QC501 Y-OUT VIDEO DRIVE QC201 C506 CONTRAST CHECK 210V CHECK BRIGHT KINE CONTROL H. BLANKING (NORMAL) 11 14 VOLTAGES T402 #39: 5.0V D404 R522...
  • Page 19 NO SOUND(CN-200I) GO TO CHECK FOR SIGNAL AT I501 #1 GO TO CHECK MONO 100% MOD -> 0.424 Vp-p #2 9V (B+) I601 CHECK 1Vp-p CHECK EXT SOUND MUTE ON: 5V (MUTE) SIGNAL OFF:L OFF: 0V #1 9V (B+) CHECK 1Vp-p #2(0~5V) I602 #8(0~5V)
  • Page 20 NO SOUND(CN-200A) GO TO CHECK FOR SIGNAL AT I501 #1 GO TO CHECK 4.5V #30 9V (B+) CHECK MONO 100% MOD #2(9VDC) -> 0.693 Vp-p IM601 L OUT CHECK R/L OUTPUT R OUT CHECK 4.5V MUTE ON: 5V (MUTE) OFF: 0V #1 9V (B+) CHECK 1Vp-p...
  • Page 21 CH DON'T STOP GO TO GOOD CHECK INPUT SIGNAL CONDITIONS LOSS OF SIGNAL OR WEAK SIGNAL IF OUTPUT I501 8, 9 U101 LA7674 TUNER CHECK ADJUST AFT WINDOW RF AGC VTG. R113 1.6V ~ 3.4V I701 LC864616A ADJUST PIF & AFT REFER TO GENERAL ADJUSTMENTS L: NO SIGNAL...
  • Page 22 NO COLOR CHECK CENTER 3.5V TINT APC FILTER COLOR X502 CENTER I501 CHECK LA7674 CRYSTAL 3.579545MHZ CHECK COMPOSITE C506 VIDEO Q901 Q902 QC201 Emitter Q903 LUMINANCE (-Y) VIDEO B (210V) CHECK CONNECTOR P901 NO VERTICAL DEFLECTION CHECK 9V CHECK 9V CHECK VERT.OUT I501...
  • Page 23 ON SCREEN DISPLAY DOES NOT OPERATE CHECK FOR,60Hz / VS R, G, B, BL CHANGE / HS I701 IF OSD DOES NOT OPERATE, CHANGE I701 CHECK FOR, 15, 734Hz OSC CHECK REMOTE CONTROL DOES NOT OPERATE IL01 REMOCON SENSOR GND 5V OUT CHECK WAVE- FORM...
  • Page 24 PIN ASSIGN OF IC LC864616A(I701) 1 P10 P07 42 POWER(O) VIDEO MUTE(O) KEY OUT 2 P11 DATA(O) KEY OUT CLOCK(O) 3 P12 KEY OUT ENABLE(O) 4 P13 KEY IN 3-LAN TV/VID 5 P14 SOUND MUTE(O) KEY IN TV/VIDEO(O) 6 P15 MN/ST EEPROM KEY IN...
  • Page 25 DESCRIPTION OF SEMICONDUCTORS LA7674 (VIF/SIF/VIDEO/CHROMA/DEFLECTION) 1. Case Outline : SDIP 52P 2. Pin Connections/Block Diagram IC501 LA7674 IF/VIDEO/CHROMA/DEF LOCK VIDEO EX A RF AGC VIDEO RF AGC AV S.W IN V TINT EX. VIN CONT TINT KILL- VIDEO COLOR BDET BLACK EXPAND SHARP...
  • Page 26 DTQ-26S1FC/FS/FSP/HC/HS/HSP EXPLODED VIEW...
  • Page 27 DTQ-29S1FCN/FSN/FSP/HC/HS/HSP EXPLODED VIEW...

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