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Toshiba 20AS24 Service Manual

Color television
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FILE NO. 050-200406

SERVICE MANUAL

COLOR TELEVISION
20AS24
DOCUMENT CREATED IN JAPAN, Mar., 2004

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Summary of Contents for Toshiba 20AS24

  • Page 1: Service Manual

    FILE NO. 050-200406 SERVICE MANUAL COLOR TELEVISION 20AS24 DOCUMENT CREATED IN JAPAN, Mar., 2004...

  • 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.

  • 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: Purity And Convergence

    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 CP601 C406 R403 C435 D410 W003 CP803A D405 W002 C403 R410 W008 W007 C448_1 FB401 C434 C440_1 C401 R421 R408 W001 W062 Q402 L401 W011 C527 HS402 R542 B503 R446 HS501 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_2 R108 R105 C609 C104 C102 R129 R104 C501_2 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 C630 V_FEEDBACK AT+5V ABCL R124_1 H_OUT C629 X-RAY 0.01 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) FUSE. ATTENTION :POUR UNE PROTECTION CONTINUE LES RISQUES 4A 125V D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 4A 125V (F501). TO SOUND/AV R517_1 D505...
  • 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 LA78040N-E CD803 CP803A B2013H02-4P CP803B B2013H02-4P 2EDA3001 HEATER...
  • Page 23 SOUND/AV SCHEMATIC DIAGRAM (MAIN PCB) RCA JACK WHITE TO MICON/CHROMA/TUNER J703 (FRONT) AV1-09D-4 ACCESSORY R703 W811 AUDIO 2 AUDIO_IN A_IN UM-4 R704 V_IN VIDEO 2 BT001 VIDEO_IN R03(AB)E_2P_G RCA JACK YELLOW J702 TM101 AV1-09D-3 RC-EH020 UM-4 BT002 R03(AB)E_2P_G W807 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 8 0.5V 5ms/div 10V 5ms/div 200mV 20µs/div 0.5V 5ms/div 9 20V 20µs/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 102B 102B 102A PCB110 (CRT PCB ASS'Y) PCB010 (MAIN PCB ASS'Y) 101D 101B 101C 101A...
  • Page 27 MECHANICAL EXPLODED VIEW (PACKING DIAGRAM) 113, 114, 115, TM101...

  • Page 28: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AE003261 A3M217J720 CABINET,FRONT ASSY 101A AE001499 701WPJC339 CABINET,FRONT 101B AE001500 713WPAA046 GLASS,LED 101C AD300694 713WPAA050 GUIDE,REMOCON 101D AE001501 735WPBA807 BUTTON,FRAME AE003262 A3M217J740 CABINET,BACK ASSY 102A AE003263 702WPAA593 CABINET,BACK 102B AE001694 800WQ0A014 FELT SHEET...

  • 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 ! 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 30 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES D515 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 ! 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 D602 BZ410023 D97U09R11B...
  • Page 31 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description MISCELLANEOUS EL002 BZ614044 124120301A EYE LET XRY20X30BD ! F501 AD302166 081PC04005 FUSE 51MS040L ! FB401 AE003283 043220061F TRANSFORMER,FLYBACK FQI20B103_M FH501 AE002634 06710T0009 HOLDER,FUSE EYF-52BCY FH502 AE002634 06710T0009 HOLDER,FUSE EYF-52BCY OS101 AD301048 0773071001...
  • Page 32 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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