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Toshiba 20AS22 Service Manual
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Toshiba 20AS22 Service Manual

Toshiba 20AS22 Service Manual

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FILE NO. 050-200206
SERVICE MANUAL
COLOR TELEVISION
20AS22
DOCUMENT CREATED IN JAPAN, May., 2002

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  • Page 1 FILE NO. 050-200206 SERVICE MANUAL COLOR TELEVISION 20AS22 DOCUMENT CREATED IN JAPAN, May., 2002...

  • Page 2: Servicing Notices On Checking

    SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.

  • Page 3: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 19 inch / 480.0mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.35G/0.30G Color System NTSC Speaker 1Speaker Position Bottom Size 3 Inch Impedance Sound Output 1.5 W 10%(Typical) 1.0 W NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System System M...
  • Page 4 GENERAL SPECIFICATIONS On Screen Menu Display Menu Type Character Picture Contrast Brightness Color Tint Sharpness Audio Bass Treble Balance BBE On/Off Stable Sound On/Off CH Set Up TV/CABLE(CATV) Auto CH Memory Add/ Delete Lock Language V-chip CH Label Favorite CH Color Stream DVD/DTV Control Level Volume...
  • Page 5 GENERAL SPECIFICATIONS G-10 Remote Unit RC-EH Control Glow in Dark Remocon Format Toshiba Custom Code 40-BF h Power Source Voltage(D.C) UM size x pcs UM-4 x 2 pcs Total Keys Keys Keys Power CH Up CH Down Volume Up Volume Down...
  • Page 6 GENERAL SPECIFICATIONS G-11 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type USA,ORION Type Auto Search CH Allocation Just Clock Function CH Label VM Circuit Full OSD Premiere Comb Filter Lines Auto CH Memory Hotel Lock Closed Caption Stable Sound...
  • Page 7 GENERAL SPECIFICATIONS G-13 Interface Switch Front Power System Select Main Power SW Sub Power Channel Up/Reset Channel Down/Enter Volume Up/Set Up Volume Down/Set Down MENU=Volume Up+Volume Down Rear AC/DC TV/CATV Selector Degauss Main Power SW Indicator Power Stand-by On Timer Terminals Front Video Input...

  • Page 8: Removal Of Anode Cap

    DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 1. REMOVAL OF ANODE CAP remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.

  • Page 9: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
  • Page 10 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 11: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 1 second. Remocon Key Set Key Operations Releasing of V-CHIP and LOCK PASSWORD.

  • Page 12: Before Making Electrical Adjustments

    ELECTRICAL ADJUSTMENTS BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: RF AGC Read and perform these adjustments when repairing the Place the set with Aging Test for more than 15 minutes. circuits or replacing electrical parts or PCB assemblies. Receive the VHF HIGH (63dB). Connect the digital voltmeter to the W043.
  • Page 13 ELECTRICAL ADJUSTMENTS 2-6: HORIZONTAL PHASE 2-11: SUB TINT/SUB COLOR Receive the monoscope pattern. Receive the color bar pattern. (RF Input) Using the remote control, set the brightness and Connect the oscilloscope to TP023. contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and Activate the adjustment mode display of Fig.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-13: Confirmation of Fixed Value (step No.) Please check if the fixed values of the each adjustment items are set correctly referring below. FUNCTION H VCO BRIGHT MAX BRIGHT MIN CONT CENT CONT MIN COLOR MAX COLOR MIN SHARPNESS FM LEVEL LEVEL...

  • Page 15: Purity And Convergence Adjustments

    ELECTRICAL ADJUSTMENTS 3-3: STATIC CONVERGENCE 3. PURITY AND CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator.

  • Page 16: Electrical Adjustment Parts Location Guide (Wiring Connection)

    ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CP601 FB401 CP806 TU001 J801 CP401 CRT PCB L503 CP502 S501B S501A CD101A CD101B MAIN PCB AC IN SPEAKER...

  • Page 17: Block Diagram

    BLOCK DIAGRAM TU001 CHROMA IC CH. UP IC601 M61250FP X602 3.579545MHz IC1001 AN7511 VOL. UP X' TAL AUDIO OUT MICON IC SOUND AMP SP1001 CH. DOWN RF AGC OUT IC101 OEC7072A CF601 SAW FILTER VIF IN (1) VOL. DOWN AUDIO MUTE Q606 VIF IN (2) 8.7V REG OUT...
  • Page 18 PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE S501B CP502 _A_V R500 D105_1 CD501_1 D509 C505 C526 L501 FH501 FH502 F501 S501A C502 4A125VOR250V D504 OS101 W819 C801 C503 B503 C514 D502 W821 C501 D503 R514 Q802 Q803 R509_1 C522 Q801 W012 D508...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R1001 R601 R612 R1004 R617 R1008 R628 R633 R129 R134 R104 R420 R133 IC101 C113 R118 C114 R132 R814...
  • Page 20 MICON/TUNER SCHEMATIC DIAGRAM ACCESSORY (MAIN PCB) UM-4 BT001 R03(AB)E_20_T TU001 ENV56DB6G3 UM-4 BT002 TM101 R03(AB)E_20_T 076NOEH020 R128 W835 R607 C003 R101 R126 2.7K FROM/TO CHROMA S811X OS101 PIC-37143SY TUNER+5V FROM DEFLECTION/CRT R002 R001 18K 1/2W 18K 1/2W X-RAY FROM TV POWER R143 PROTEC STANDBY_H...

  • Page 21: Chroma Schematic Diagram

    CHROMA SCHEMATIC DIAGRAM (MAIN PCB) FROM TV POWER UNREG+12V W818 Q603 KTC3203_Y R623 120 1/4W Q605 FROM SOUND/AV Q604 KTC3203_Y KTC3203_Y Q606 VIDEO_IN KTC3203_Y 11.3 SWITCHING Q607 KTC3198 D609 1SS133 CF603 R642 D605 SFSRA4M50CF00-A0 8.65 11E1-EIC 1.81 8.65 8.56 3.95 4.95 1.95 2.65 0 3.2 1.9 2.52...

  • Page 22: Tv Power Schematic Diagram

    TV POWER SCHEMATIC DIAGRAM (MAIN PCB) TO SOUND/AV 4A 125V R517 D505 CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, SOUND+B REPLACE ONLY WITH THE SAME TYPE 4A 125V (F501) SB290S FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES C518 D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 4A 125V (F501).
  • Page 23 DEFLECTION/CRT SCHEMATIC DIAGRAM CP802A CP802B (MAIN PCB) CD802 9253_010_000_000 9253_010_000_000 6032038 FROM CHROMA CLAMP CLAMP CLAMP CLAMP CLAMP G.OUT G.OUT G.OUT G.OUT G.OUT R.OUT R.OUT R.OUT R.OUT R.OUT B.OUT B.OUT B.OUT B.OUT B.OUT V-OUT IC IC401 AN5522 HEATER HEATER HEATER HEATER THERMAL PROTECTION...
  • Page 24 SOUND/AV SCHEMATIC DIAGRAM (MAIN PCB) J703 (FRONT) TO CHROMA AV1-09D-4 R703 AUDIO 2 AUDIO_IN A_IN R704 V_IN VIDEO 2 VIDEO_IN J702 AV1-09D-3 W807 FROM TV POWER SOUND_GND SOUND+B SPEAKER CD101A CH012002 SP1001 FROM MICON/TUNER CD101B S08F21 R1001 CH012003 8 OHM AUDIO_MUTE C1002_1 R1003...
  • Page 25 WAVEFORMS MICON/TUNER 11 1V 20µs/div 200mV 5ms/div 0.5V 20µs/div 12 1V 20µs/div 200mV 20µs/div 0.5V 20µs/div 1V 20µs/div 3 200mV 20µs/div 20V 20µs/div DEFLECTION/CRT 200mV 5ms/div 14 0.5V 5ms/div 9 200mV 20µs/div CHROMA 15 20V 20µs/div 0.5V 5ms/div 0.5V 2ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 26 WAVEFORMS 16 2V 20µs/div 21 50V 20µs/div 26 500mV 20µs/div 200V 20µs/div 22 50V 20µs/div SOUND/AV 10V 5ms/div 0.5V 1ms/div 10V 5ms/div 1V 1ms/div 200mV 500µs/div 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 27: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW PCB110 (CRT PCB) PCB010 (MAIN PCB)

  • Page 28: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AD301400 A3L210C720 CABINET,FRONT ASSY AD301401 701WPJB654 CABINET,FRONT AD300695 713WPAA051 GLASS,LED AD300694 713WPAA050 GUIDE,REMOCON AD301402 735WPBA389 BUTTON,FRAME AD301403 702WPAA183 CABINET,BACK AD301404 722549A073 SHEET,RATING AD300007 7230006755 SHEET,CAUTION AD300844 800WQ00038 FELT SHEET BZ710009 741WUA0019 SPRING,EARTH...

  • Page 29: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R401 BZ210089 R4X5T6273F R,METAL 27K OHM 1/6W ! R408 BZ210092 R4X5T6103F R,METAL 10K OHM 1/6W ! R409 BZ210089 R4X5T6273F R,METAL 27K OHM 1/6W ! R429 BZ210032 R6558A3R9J R,FUSE 3.9 OHM 2W R448...
  • Page 30 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES D604 BZ410021 D97U05R61B DIODE,ZENER MTZJ5.6B T-77 D605 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC D606 BZ410022 D97U06R81B DIODE,ZENER MTZJ6.8B T-77 D607 BZ410021 D97U05R61B DIODE,ZENER MTZJ5.6B T-77 D609 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D610 AD300070 D97U01201B...
  • Page 31 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description MISCELLANEOUS FH502 BZ614005 06710T0006 HOLDER,FUSE EYF-52BC OS101 BZ614290 077Q037003 REMOTE RECEIVER PIC-37143SY S101 AD300889 WHL6032038 FLAT CABLE AWM2468 AWG26 10C BLACK 320MM ! SP1001 AD300689 070Y132018 SPEAKER S08F21 TH501 BZ410056 DF20A3R0Q0 DEGAUSS ELEMENT...
  • Page 32 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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