Toshiba 20AS25 Service Manual
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Toshiba 20AS25 Service Manual

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FILE NO. 050-200501

SERVICE MANUAL

COLOR TELEVISION
20AS25
DOCUMENT CREATED IN JAPAN, Jan., 2005

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Summary of Contents for Toshiba 20AS25

  • Page 1: Service Manual

    FILE NO. 050-200501 SERVICE MANUAL COLOR TELEVISION 20AS25 DOCUMENT CREATED IN JAPAN, Jan., 2005...

  • 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: About Lead Free Solder (Pbf)

    ABOUT LEAD FREE SOLDER (PbF) Distinction of PbF PCB: PCBs (manufactured) using lead free solder will have a PbF printing on the PCB. (Please refer to figures.) Caution: • Pb free solder has a higher melting point than standard solder; Typically the melting point is 50°F~70°F(30°C~40°C) higher.

  • Page 4: Table Of Contents

    CONTENTS SERVICING NOTICES ON CHECKING ...................... A1-1 HOW TO ORDER PARTS ........................... A1-1 IMPORTANT ..............................A1-1 ABOUT LEAD FREE SOLDER (PbF) ......................A1-2 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 5: 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 6 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 7 GENERAL SPECIFICATIONS G-10 Remote Unit RC-EH Control Glow in Dark Remocon Yes[From '04 DEC O/R] 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...
  • Page 8 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 9 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 10: 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 11: 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 12 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 13: 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 2 seconds. Set Key Remocon Key Operations Releasing of V-CHIP PASSWORD.

  • Page 14: 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 15 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 16: 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 17 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 18: 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 19: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE D408 C406 CP601 R403 C435 D410 W003 CP803A W002 D405 W008 R410 W007 C403 C448_1 C434 C401 R421 FB401 R408 W001 W062 Q402 L401 R503 D506 W011 R542 HS402 HS501 B503 R446 R448 C511 Q502...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN (CHIP MOUNTED PARTS) SOLDER SIDE R702 R128 R101 IC199_1 CCD004A R610 R609 R627 R108 R105 R129 R420...

  • Page 21: Micon/Chroma/Tuner

    MICON/CHROMA/TUNER SCHEMATIC DIAGRAM (MAIN PCB) R621 220 1/4W H.CTL Q607 KTC3198 R618 FROM/TO DEFLECTION/CRT C118 R608 CLAMP 6.3V R110 1K 1/4W P.CON+B C101 R109 10K 1/4W V_OUT 0.01 10K 1/4W C630 V_FEEDBACK AT+5V ABCL R124 H_OUT C629 X-RAY 1 CNVSS 41 NC 0.01 R130...

  • Page 22: Tv Power

    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 23 DEFLECTION/CRT SCHEMATIC DIAGRAM CP802A CP802B (MAIN PCB) B2013H02-5P B2013H02-5P 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 CP803A B2013H02-4P CP803B B2013H02-4P HEATER HEATER HEATER HEATER...
  • Page 24 SOUND/AV SCHEMATIC DIAGRAM (MAIN PCB) ACCESSORY RCA JACK WHITE TO MICON/CHROMA/TUNER J703 UM-4 AV1-09AD-4 (FRONT) BT001 R703 W811 AUDIO 2 GR03X-SP2 AUDIO_IN A_IN UM-4 R704_2 V_IN VIDEO 2 TM101 BT002 VIDEO_IN RC-EH050(CT-859) 10 1/4W GR03X-SP2 RCA JACK YELLOW J702 AV1-09AD-3 W807 FROM TV POWER CD101A...

  • Page 25: Deflection/Crt

    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 50V 20µs/div 0.5V 5ms/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 26: 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 27: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW 102B 102B 102A PCB110 (CRT PCB ASS'Y) PCB010 (MAIN PCB ASS'Y) 101D 101B 101C 101A...
  • Page 28 MECHANICAL EXPLODED VIEW (PACKING DIAGRAM) 113, 114, 115, TM101...

  • Page 29: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AE006004 7A701A356A FRONT CABI ASS'Y 101A AE006173 701WPJC966 CABINET,FRONT 101B AE001500 713WPAA046 GLASS,LED 101C AD300694 713WPAA050 GUIDE,REMOCON 101D AE006174 735WPBB357 BUTTON,FRAME AE005646 7A702A088A BACK CABI ASS'Y 102A AE006175 702WPAA844 CABINET,BACK 102B AE005648...

  • Page 30: 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 BZ210258 R4X5T6472F R,METAL 4.7K OHM 1/6W ! R409 BZ210089 R4X5T6273F R,METAL 27K OHM 1/6W ! R429...
  • Page 31 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 DIODE,ZENER...
  • Page 32 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description MISCELLANEOUS CP803B BZ614334 067U004029 WIRE HOLDER B2013H02-4P EL001 BZ614043 124116281A EYE LET XRY16X28BD EL002 BZ614044 124120301A EYE LET XRY20X30BD ! F501 AD302166 081PC04005 FUSE 51MS040L ! FB401 AE003283 043220061F TRANSFORMER,FLYBACK FQI20B103_M FH501...
  • Page 33 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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