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Toshiba 20A43 Service Manual
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Toshiba 20A43 Service Manual

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FILE NO. 050-200308
SERVICE MANUAL
COLOR TELEVISION
20A43
DOCUMENT CREATED IN JAPAN, Apr., 2003

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  • Page 1 FILE NO. 050-200308 SERVICE MANUAL COLOR TELEVISION 20A43 DOCUMENT CREATED IN JAPAN, Apr., 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 2Speaker Position Front Size 2 x 4.7 Inch Impedance Sound Output 2.5+2.5 W 10%(Typical) 2.0+2.0 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 2-11: SEPARATION 1, 2 Receive the monoscope pattern. Please do the method (1) or method (2) adjustment. Using the remote control, set the brightness and contrast Method (1) to normal position. Check if the step No. of V. SHIFT is "02". Set the multi-sound signal generator for each different Adjust the VR401 until the horizontal line becomes fit to L-ch and R-ch frequency (Ex.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-14: SUB TINT/SUB COLOR 2-18: Confirmation of Fixed Value (Step No.) Receive the color bar pattern. Please check if the fixed values of the each adjustment Connect the oscilloscope to TP024. items are set correctly referring below. (RF/AV/CS) Activate the adjustment mode display of Fig.
  • Page 16 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 J701 CP803A CP601 VR401 FB401 VR402 CRT DY TP402 TU001 CP401 CP1001 VR502 SPEAKER CP502 L503 DEGAUSS COIL CP802A AC IN S501A S501B J1001...

  • Page 18: Block Diagrams

    BLOCK DIAGRAM COMB FILTER IC IC1501 TC9045F CH. DOWN MICON/CHROM IC IC101 VOL. DOWN OEC7091A CH. UP RGB Proc.2 VOL. UP OSD SW Q804 CONTRAST BRIGHTNESS RED AMP RGB OUTPUT Stage POWER Chroma DRIVE Q805 CUT OFF Proc. ACC/C-BPF HV BLK OS101 GREEN AMP RGB Proc.1...

  • Page 19: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE SW101 SW104 SW103 SW105 SW102 J710 D106 W012 J711 OS101 J712 R1013 6.3A125VOR250V W818 Q1502 S801Y R1012 FH502 TP024 W898 W876 W865 W103 FH501 Q1505 F501 C505 Q1501 J801 W044 CP806_1 Q608 Q602 W009 W043...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE C724 IC901 R004 R003 IC302 C309 R006 C307 R437 R314 R507 R1003 C519 C512 R505 R1008 R121_1 C603 C609 R814 C809 W879 R604 R627 R617 C1519 R609 R610 C1518 C629 IC1501 R1503 R1501 C1502...
  • Page 21 MICON/CHROMA/TUNER SCHEMATIC DIAGRAM (MAIN PCB) W858 H.CTL Q607 Q609 KTC3198 R621 KTC3198 FROM COMBI/FILTER R618 Y_IN ACCESSORY 8.2K 1/4W FROM/TO DEFLECTION/CRT BT001 R608 R03(AB)E_2P_G C118 CLAMP C630_1 1K 1/4W CLAMP_OFF C101 6.3V TM101 BT002 R110 V_OUT C632 R03(AB)E_2P_G RC-EH030 0.01 F R109 P.CON+8V[A] V_FEEDBACK...
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) (CRT 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...
  • Page 23 TV POWER SCHEMATIC DIAGRAM (MAIN PCB) W836 TO MICOM/CHROMA/MICON REMOTE+12V W812 UNREG+12V RELAY DRIVE Q504 D516 KTC3198 1SS133 TO DEFLECTION/CRT B503 W5RH3.5X5X1.0 S802Y UNREG+12V RY501 ALKS321 C516 W848 DEGAUSS COIL TO SOUND L503 500V 0.001 8R200026 CP502 A1561WV2-2P SOUND+B TH501 D505 30DF6-FC B59203-S1060-B14...
  • Page 24 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/CHROMA/TUNER R308 AUDIO_MUTE P.CON+8V[B] C309 0.039 R311 L IN L ONT Tone Volume 2.2K SURR Balance Control Control /MUTE MODE control R IN Vref R OUT IIC Decoder St.PLL OUT SW Pilot Input Switch L-R Filter L-R Demod Cancel...
  • Page 25 COMB/FILTER SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/CHROMA/TUNER STEREO+5V C_IN Y_IN P.CON+8V[B] C1523 0.01 F C1514 FROM AV BUFFER Q1502 VIDEO KTC3198 R1508 C1511 0.01 F C1512 C1502 47P CH R1501 BUFFER D.VCC D.VSS Q1501 KTA1266 C1515 R1503 KILLER CKin W824 100P CH 2.7K TEST...
  • Page 26 AV SCHEMATIC DIAGRAM (MAIN PCB) VIDEO_3_IN VIDEO IN(FRONT) J710 HTJ-032-03AY AUDIO_L IN(FRONT) C701 J711 R734 L3_IN HTJ-032-03AW AUDIO_R IN(FRONT) C702 J712 R733 R3_IN HTJ-032-03AR TO SOUND FRONT_AUDIO_L FRONT_AUDIO_R S802X REAR_AUDIO_R REAR_AUDIO_L FROM/TO TV POWER VIDEO AMP IC IC702 NJM2234L FROM MICON/CHROMA/TUNER P.CON+8V[A] Vin1 Vin2...

  • Page 27: Micon/Chroma/Tuner

    WAVEFORMS MICON/CHROMA/TUNER 200V 20µs/div 20V 20µs/div 1V 20µs/div 10V 5ms/div 3 200mV 20µs/div 200mV 20µs/div DEFLECTION/CRT 0.5V 5ms/div 10V 5ms/div 14 0.5V 5ms/div 5 1V 20µs/div 15 20V 20µs/div 50V 20µs/div 6 1V 20µs/div 16 2V 20µs/div 21 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 28 WAVEFORMS 31 200mV 1ms/div 22 50V 20µs/div SOUND 25 0.5V 1ms/div 0.5V 1ms/div 26 200mV 1ms/div 0.5V 1ms/div 200mV 1ms/div 28 200mV 1ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 29: Mechanical Exploded Views

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

  • Page 30: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AE000659 A3M901H720 CABINET,FRONT ASSY 101A AD301454 701WPJB692 CABINET,FRONT 101B AD301455 711WPA0170 PLATE,FRONT 101C AD301456 713WPA0204 GUIDE,REMOCON 101D AD301457 735WPA0652 BUTTON,BASE 101E AD301458 735WPBA419 BUTTON,FRAME 101F AE000003 800WQ00045 FELT SHEET AE000660 A3M901H740 CABINET,BACK ASSY...

  • Page 31: 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 32 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES ! D514 BZ410077 D2WXSB1400 DIODE,SCHOTTKY SB140-EIC D515 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D516 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D517 AD300731 D2WXN49370 DIODE SILICON 1N4937 D520 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D521 BZ410006 D1VT001330 DIODE,SILICON...
  • Page 33 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description SWITCHES SW102 BZ612010 0504101T34 SWITCH,TACT EVQ21505R SW103 BZ612010 0504101T34 SWITCH,TACT EVQ21505R SW104 BZ612010 0504101T34 SWITCH,TACT EVQ21505R SW105 BZ612010 0504101T34 SWITCH,TACT EVQ21505R VARIABLE RESISTORS VR401 BZ210238 V1K6313BTE VOLUME,SEMI FIXED NVG6TLTAB102 VR402 BZ210237 V1K63Q4BTE...
  • Page 34 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...
  • Page 35 FILE NO. 050-200308A SUPPLEMENT SERVICE MANUAL COLOR TELEVISION 20A43 -SUMMARY- This supplement serves as an update to the original Service Manual, file number 050-200308. Please refer to this Supplement in conjunction with the original Service Manual when servicing this model.
  • Page 36 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. 050-200308A DATE:Nov.,2003 RANK: Product: COLOR TELEVISION...
  • Page 37 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 098Y210452 CRT W/DY A51LZM10X16N45 AE001906 Change of CRT. D607 D97U01201B DIODE,ZENER MTZJ12B T-77 AD300070 D608 D97U01201B DIODE,ZENER...
  • Page 38 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. 050-200308B DATE:Nov.,2003 RANK: Product: COLOR TELEVISION...
  • Page 39 ELECTRICAL REPLACEMENT PARTS LIST MFR'S VERSION B MFR'S VERSION D REF. NO. PART NO. DESCRIPTION TSB P/N PART NO. DESCRIPTION TSB P/N CAUSE TU001 0163100002 RF UNIT ENG36A01G AD302169 0163100007 RF UNIT ENG36A01GR AE001528 Improvement of over modulation. MAIN PCB ASS'Y (VERSION B) MAIN PCB ASS'Y (VERSION D) PCB010 A3M901X010 TMC563A...
  • Page 40 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. 050-200308C DATE:Nov.,2003 RANK: Product: COLOR TELEVISION...
  • Page 41 IC199 memory data WHEN REPLACING EEPROM (MEMORY) IC INITIAL From Cause Change of MICON IC. How to Change memory data Enter DATA SET mode by setting VOLUME to minimum. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second. ADDRESS and DATA should appear as FIG 1.
  • Page 42 ELECTRICAL REPLACEMENT PARTS LIST MFR'S VERSION D MFR'S VERSION E REF. NO. PART NO. DESCRIPTION TSB P/N PART NO. DESCRIPTION TSB P/N CAUSE IC101 I56F07091A OEC7091A I56F07091B OEC7091B AE002804 MICON VERSION UP MAIN PCB ASS'Y (VERSION D) MAIN PCB ASS'Y (VERSION E) PCB010 A3M901X010 TMC563A AE002800 A3M901X010...
  • Page 43 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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