Toshiba 20AS23 Service Manual
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Toshiba 20AS23 Service Manual

Toshiba 20AS23 Service Manual

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FILE NO. 050-200333
SERVICE MANUAL
COLOR TELEVISION
20AS23
DOCUMENT CREATED IN JAPAN, Jul., 2003

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  • Page 1 FILE NO. 050-200333 SERVICE MANUAL COLOR TELEVISION 20AS23 DOCUMENT CREATED IN JAPAN, Jul., 2003...

  • 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: Table Of Contents

    CONTENTS SERVICING NOTICES ON CHECKING ...................... A1-1 HOW TO ORDER PARTS ........................... A1-1 IMPORTANT ..............................A1-1 CONTENTS ..............................A2-1 GENERAL SPECIFICATIONS ........................A3-1~A3-5 DISASSEMBLY INSTRUCTIONS 1.REMOVAL OF ANODE CAP ......................B1-1 2.REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ............... B2-1, B2-2 SERVICE MODE LIST ..........................

  • Page 4: 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 5 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 Language V-chip Lock On Timer CH Label Favorite CH Color Stream DVD/DTV Control Level...
  • Page 6 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 7 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 8 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 9: Disassembly Instructions

    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 10: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS When IC starts moving back and forth easily after REMOVAL AND INSTALLATION OF desoldering completely, pickup the corner of the IC using a FLAT PACKAGE IC 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 11 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin-tip Take care of the polarity of new IC and then install the new Soldering Iron. (Refer to Fig. 2-8.) IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 12: 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. Set Key Remocon Key Operations Releasing of V-CHIP PASSWORD and LOCK PASSWORD.

  • Page 13: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE 2. BASIC ADJUSTMENTS Read and perform these adjustments when repairing the 2-1: CUT OFF circuits or replacing electrical parts or PCB assemblies. Adjust the unit to the following settings. CAUTION R.DRIVE=10, B.DRIVE=10, R.BIAS=64, G.BIAS=64, • Use an isolation transformer when performing any service B.BIAS=64, BRI.CENT=100, CONT.MAX=60.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-6: VERTICAL SIZE Receive the monoscope pattern. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (06) on the remote control to select “V.
  • Page 15 ELECTRICAL ADJUSTMENTS 3. PURITY AND CONVERGENCE 3-3: STATIC 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 ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB CP806 TP022 TU001 CP803A TP023 FB401 CP802B CP801 DEGAUSS COIL CP502 S501B CD501 AC IN S501A CD101B SPEAKER CD101A MAIN PCB...

  • Page 17: Block Diagram

    BLOCK DIAGRAM TU001 11 12 CH. DOWN IC1001 AN7511 VOL. DOWN SPEAKER SOUND AMP SP1001 CH. UP VOL. UP RGB Proc.2 Q801 OSD SW CONTRAST BRIGHTNESS RED OUT POWER RGB OUTPUT Stage Chroma DRIVE Proc. Q802 CUT OFF ACC/C-BPF OS101 GREEN OUT HV BLK APC/KILLER...

  • Page 18: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE D408 C406 R403 C435 CP601 D410 W003 CP803A W002 D405 R410 W008 C403 W007 C448_1 FB401 C434 C440_1 C401 R421 R408 W001 W062 Q402 L401 W011 C527 HS402 B503 R542 HS501 R446 D509 R448 R503...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN (CHIP MOUNTED PARTS) SOLDER SIDE R703 R702 R704 R128 R101 C112_1 R610 R609 C627 C626 R627 C1004 R108 R105 C609 C104 C102 R129 R104 C501_1 R420 R003 R004 C001...
  • Page 20 MICON/CHROMA/TUNER SCHEMATIC DIAGRAM (MAIN PCB) H.CTL Q607 KTC3198 R621 220 1/4W R618 FROM/TO DEFLECTION/CRT S803X R608 CLAMP C118 1K 1/4W R110 10K 1/4W P.CON+B C101 6.3V V_OUT R109 10K 1/4W 0.01 F C630 V_FEEDBACK AT+5V ABCL R124_1 H_OUT C629 X-RAY 1 CNVSS 41 NC R.OUT...
  • Page 21 TV POWER SCHEMATIC DIAGRAM (MAIN PCB) CAUTION :FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE 4A 125V (F501) TO SOUND/AV FUSE. ATTENTION :POUR UNE PROTECTION CONTINUE LES RISQUES 4A 125V D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 4A 125V (F501).
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) CD802 CP802A B2013H02-5P CP802B B2013H02-5P 2EDA3001 FROM MICON/CHROMA/TUNER 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 CD803 CP803A B2013H02-4P CP803B B2013H02-4P 2EDA3001 HEATER...
  • Page 23 SOUND/AV SCHEMATIC DIAGRAM (MAIN PCB) ACCESSORY UM-4 BT001 R03(AB)E_2P_G TM101 UM-4 RC-EH020 BT002 R03(AB)E_2P_G RCA JACK WHITE TO MICON/CHROMA/TUNER J703 (FRONT) AV1-09D-4 R703 W811 AUDIO 2 AUDIO_IN A_IN R704 V_IN VIDEO 2 VIDEO_IN RCA JACK YELLOW J702 W807 AV1-09D-3 FROM TV POWER CD101A SPEAKER SOUND_GND...

  • Page 24: Micon/Chroma/Tuner

    WAVEFORMS MICON/CHROMA/TUNER 200V 20µs/div 1 0.5V 2ms/div 6 1V 20µs/div 10V 5ms/div 20V 20µs/div 1V 20µs/div DEFLECTION/CRT 200mV 20µs/div 8 0.5V 5ms/div 10V 5ms/div 9 20V 20µs/div 0.5V 5ms/div 50V 20µs/div 5 1V 20µs/div 10 2V 20µs/div 15 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 25: Sound/Av

    WAVEFORMS 16 50V 20µs/div SOUND/AV 0.5V 1ms/div 1V 1ms/div 200mV 500µs/div 20 500mV 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 26: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW PCB110 (CRT PCB ASS'Y) PCB010 (MAIN PCB ASS'Y) 101D 101B 101C 101A...

  • Page 27: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AE001498 A3M213C720 CABINET,FRONT ASSY 101A AE001499 701WPJC339 CABINET,FRONT 101B AE001500 713WPAA046 GLASS,LED 101C AD300694 713WPAA050 GUIDE,REMOCON 101D AE001501 735WPBA807 BUTTON,FRAME AE001502 A3M213C740 CABINET,BACK ASSY AE001503 722549A222 SHEET,RATING AD300007 7230006755 SHEET,CAUTION AE001693 723000C044...

  • Page 28: 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 ! R404 AE001556 R615U2680J R,FUSE 68 OHM 1/2W ! R408 AD301014 R4X5T6472F R,METAL 4.7K OHM 1/6W ! R409 BZ210089 R4X5T6273F R,METAL 27K OHM 1/6W ! R429...
  • Page 29 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES ! D516 AD300731 D2WXN49370 DIODE,SILICON 1N4937 D521 BZ410022 D97U06R81B DIODE,ZENER MTZJ6.8B T-77 D522 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D528 BZ410021 D97U05R61B DIODE,ZENER MTZJ5.6B T-77 D603 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D604 BZ410058 D97U08R21B...
  • Page 30 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description MISCELLANEOUS ! FB401 AE001530 043219016F TRANSFORMER,FLYBACK FQI20B103 FH501 BZ614005 06710T0006 HOLDER,FUSE EYF-52BC FH502 BZ614005 06710T0006 HOLDER,FUSE EYF-52BC OS101 AD301048 0773071001 REMOTE RECEIVER RPM7138-H5 S101 AD301450 WBL6032038 FLAT CABLE AWM2468 A WG26 4C BLACK 320MM S102 BZ614310...
  • Page 31 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...
  • Page 32 TOSHIBA FILE NO. 050-200312A SUPPLEMENT SERVICE MANUAL COLOR TELEVISION 20A23 -SUMMARY- This supplement serves as an update to the original Service Manual, file number 050-200312. Please refer to this Supplement in conjunction with the original Service Manual when servicing this model.
  • Page 33 TOSHIBA CORPORATION DIGITAL MEDIA NETWORK COMPANY VISUAL MEDIA NETWORK DIV. INTERNATIONAL CUSTOMER SERVICE & SUPPORT DEPT [11F-B] TOSHIBA BLDG. 1-1, SHIBAURA 1-CHOME, MINATOKU, TOKYO 105-8001, JAPAN FACSIMILE: (03)5444-9439 PONE: (03)3457-3536 SERVICE INSTRUCTION FILE NO. 050-200312A DATE:Nov.,2003 RANK: Product: COLOR TELEVISION...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST MFR'S VERSION A MFR'S VERSION B REF. NO. PART NO. DESCRIPTION TSB P/N PART NO. DESCRIPTION TSB P/N CAUSE V801 098Q210449 CRT W/DY A51AEZ90X24 AD302300 098Y210452 CRT W/DY A51LZM10X16N45 AE001906 Maker change of CRT. TU001 0163100002 RF UNIT ENG36A01G AD302169 0163100007 RF UNIT...
  • Page 35 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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