Toshiba 20A23 Service Manual

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FILE NO. 050-200312

SERVICE MANUAL

COLOR TELEVISION
20A23
DOCUMENT CREATED IN JAPAN, May, 2003

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  Summary of Contents for Toshiba 20A23

  • Page 1: Service Manual

    FILE NO. 050-200312 SERVICE MANUAL COLOR TELEVISION 20A23 DOCUMENT CREATED IN JAPAN, May, 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

    TABLE OF CONTENTS SERVICING NOTICES ON CHECKING ..................A1-1 A1-1 HOW TO ORDER PARTS ......................IMPORTANT ..........................A1-1 TABLE OF CONTENTS ......................A2-1 A3-1~A3-5 GENERAL SPECIFICATIONS ....................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 20 inch / 508.0mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 1Speaker Position Front Size 1.6 x 2.8 Inch Impedance Sound Output 1.5 W 10%(Typical) 1.0 W NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System...
  • 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 Surround On/Off CH Set Up TV/CABLE(CATV) Auto CH Memory Add/ Delete Lock CH Lock Video Lock Game Timer Change Password On Timer...
  • 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 Yes(RED) 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: CONSTANT VOLTAGE circuits or replacing electrical parts or PCB assemblies. Set condition is AV MODE without signal. CAUTION Connect the digital voltmeter to the TP402. •...
  • Page 14 ELECTRICAL ADJUSTMENTS 2-6: VERTICAL SHIFT 2-10: BRIGHTNESS Receive the monoscope pattern. Activate the adjustment mode display of Fig. 1-1 and Using the remote control, set the brightness and contrast press the channel button (13) on the remote control to to normal position. select "BRI CENT".
  • Page 15 ELECTRICAL ADJUSTMENTS "A" "A" Fig. 2-2 Red 110% White 100% Fig. 2-3 2-13: Confirmation of Fixed Value (Step No.) Please check if the fixed values of the each adjustment items are set correctly referring below. (RF/AV) FUNCTION STEP NO. H VCO BRIGHT MAX BRIGHT MIN CONT CENT...
  • Page 16: Purity And Convergence

    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 17 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP024 CP806 TP022 J801 CP801 CP802B CP803B CP803A CP601 VR401 FB401 VR402 CRT DY TP402 TU001 CP401 CP1001 VR502 SPEAKER CP502 L503 DEGAUSS COIL CP802A AC IN S501A S501B J710 J711...
  • Page 18: Block Diagram

    BLOCK DIAGRAM TU001 11 12 CH. DOWN IC1001 AN7511 MICON/CHROM IC VOL. DOWN IC101 OEC7091A SPEAKER SOUND AMP SP1001 CH. UP RGB Proc.2 VOL. UP Q804 OSD SW CONTRAST BRIGHTNESS RED AMP RGB OUTPUT Stage POWER Chroma Proc. DRIVE Q805 ACC/C-BPF CUT OFF APC/KILLER...
  • Page 19: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE SW101 SW104 SW103 SW105 SW102 J710 D106 OS101 W012 J711 6.3A125COR250V FH501 F501 FH502 TP024 W876 C505 CD501 J801 Q603 CP806_1 W009 Q602 TP022 Q606 D604 Q607 W825 W875 C624 Q610 R500 TP023 CP802A W002...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R004 R003 C003 R437 R507 R1005 R1003 C519 C512 R505 R121_1 C603 C609 R814 C809 W879 R604 R627 R617 R609 R610 C629 R734 R128 R126...
  • Page 21 MICON/CHROMA/TUNER SCHEMATIC DIAGRAM (MAIN PCB) H.CTL ACCESSORY W858 Q607 Q609 R621 KTC3198 KTC3198 BT001 R03(AB)E_2P_G R618 BT002 TM101 8.2K 1/4W R03(AB)E_2P_G RC-EH020 FROM/TO DEFLECTION/CRT R608 C118 CLAMP 1K 1/4W CLAMP_OFF C101 6.3V R110 V_OUT 0.01 F R109 C630 V_FEEDBACK AT+5V ABCL H_OUT X-RAY...
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/CHROMA/TUNER CP802A B2013H02-6P CP802B B2013H02-6P CLAMP CLAMP CLAMP CLAMP CLAMP CLAMP_OFF CLAMP_OFF CLAMP_OFF CLAMP_OFF CLAMP_OFF 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_FEEDBACK V-OUT IC IC401 AN5522 CP803B B2013H02-4P CP803A B2013H02-4P...
  • Page 23 TV POWER SCHEMATIC DIAGRAM (MAIN PCB) W836 TO MICOM/CHROMA/TUNER REMOTE+12V W812 UNREG+12V RELAY DRIVE Q504 KTC3198 TO DEFLECTION/CRT UNREG+12V RY501 B503 ALKS321 W5RH3.5X5X1.0 C516 DEGAUSS COIL 500V 0.001 TO SOUND L503 8R200026 CP502 R517 D519 A1561WV2-2P SOUND+B TH501 SB290S B59203-S1060-B14 SOUND_GND R502 R501...
  • Page 24 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM MICON/CHROMA/TUNER AUDIO_MUTE FROM/TO DEFLECTION/CRT FROM/TO AV SOUND AMP IC IC1001_1 AN7511 FROM TV POWER SOUND+B W829 SOUND_GND W866 FROM MICON/CHROMA/TUNER CP1001_1 CD1001_2 CH12403B SPEAKER TID-X02P-B2 SP1001_2 810-47-171 STEREO+5V 8 OHM AUDIO_OUT R1002 W845 47K 1/4W PCB010 TMC563 ATTENTION...
  • Page 25 AV SCHEMATIC DIAGRAM (MAIN PCB) VIDEO IN(FRONT) J710 HTJ-032-03AY VIDEO_3_IN AUDIO_L IN(FRONT) J711 HTJ-032-03AW C701 R734 L3_IN FROM/TO SOUND FROM/TO TV POWER TO MICON/CHROMA/TUNER W825 MONO_F_A_IN W860 VIDEO_IN PCB010 TMC563 AUDIO SIGNAL NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE...
  • Page 26: Micon/Chroma/Tuner

    WAVEFORMS MICON/CHROMA/TUNER 1 0.5V 2ms/div 6 1V 20µs/div 200V 20µs/div 1V 20µs/div 10V 5ms/div 20V 20µs/div DEFLECTION/CRT 0.5V 5ms/div 3 200mV 20µs/div 10V 5ms/div 0.5V 5ms/div 9 20V 20µs/div 50V 20µs/div 10 2V 20µs/div 1V 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 27 WAVEFORMS 16 50V 20µs/div SOUND 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 28: Mechanical Exploded Views

    MECHANICAL EXPLODED VIEW PCB110 (CRT PCB ASS'Y) PCB010 (MAIN PCB ASS'Y) 101E 101D 101C 101D 101E 101B 101A...
  • Page 29: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AD302337 A3M903A720 CABINET,FRONT ASSY 101A AD301497 701WPJB758 CABINET,FRONT 101B AD301498 711WPA0173 PLATE,FRONT 101C AD301499 713WPA0214 GUIDE,REMOCON 101D AD301500 735WPA0670 BUTTON,BASE 101E AD301501 735WPBA435 BUTTON,FRAME BZ710039 8995034000 CORD CLIP UL CO. AE000747 A3M903A740 CABINET,BACK ASSY...
  • Page 30: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R401 AD300783 R3X181221J R,METAL OXIDE 220 OHM 1W ! R402 AE000676 R3K181102J R,METAL 1K OHM 1W ! R408 AD301014 R4X5T6472F R,METAL 4.7K OHM 1/6W ! R409 AD300037 R4X5T6153F R,METAL 15K OHM 1/6W...
  • Page 31 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES D524 BZ410064 D97U03R91B DIODE,ZENER MTZJ3.9B T-77 D526 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D527 BZ410020 D97U05R11B DIODE,ZENER MTZJ5.1B T-77 D528 BZ410021 D97U05R61B DIODE,ZENER MTZJ5.6B T-77 D603 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D604 BZ410058 D97U08R21B...
  • Page 32 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description MISCELLANEOUS ! CP502 AD300687 069S420110 CONNECTOR PCB SIDE A1561WV2-2P CP601 BZ614102 0694270139 CONNECTOR PCB SIDE 173979-7 CP801 BZ614269 069S320010 CONNECTOR PCB SIDE A2361WV2-2P CD1001 AD301494 06CH12403B CORD,CONNECTOR CH12403B CP1001 AD301495 069W120019 CONNECTOR PCB SIDE...
  • Page 33 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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