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Toshiba 20AF42 Service Manual
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Toshiba 20AF42 Service Manual

Toshiba 20AF42 Service Manual

Color television
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SERVICE MANUAL

COLOR TELEVISION
FILE NO. 050-200201
20AF42
DOCUMENT CREATED IN JAPAN, Mar., 2002

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Summary of Contents for Toshiba 20AF42

  • Page 1: Service Manual

    FILE NO. 050-200201 SERVICE MANUAL COLOR TELEVISION 20AF42 DOCUMENT CREATED IN JAPAN, Mar., 2002...

  • 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: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 20 inch / 508mmV System CRT Type Flat Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 2 Speaker Position Front Side 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...
  • Page 4 GENERAL SPECIFICATIONS On Screen Menu Display Menu Type Icon Picture Contrast Brightness Color Tint Sharpness Sound Bass Treble Balance BBE On/Off Stable Sound On/Off Set Up TV/CATV Auto CH Memory Add/ Delete Option Language CH Label Favorite CH V-Chip Lock Color Stream DVD/DTV Control Level Volume...
  • Page 5 GENERAL SPECIFICATIONS G-10 Remote Unit RC-DU Control Glow in Dark Remocon Format Toshiba Custom Code TV:40-BFh 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/- C.C.(TV/Caption/Text)
  • Page 6 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type USA,Toshiba Type Auto Search CH Allocation Just Clock Function CH Label VM Circuit Full OSD Premiere Comb Filter Lines Auto CH Memory Hotel Lock...
  • Page 7 GENERAL SPECIFICATIONS G-13 Interface Switch Front Power System Select Main Power SW Sub Power Channel Up Channel Down 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 = VIDEO3 Audio Input = VIDEO3 RCA x 2 Other Terminal...

  • Page 8: Removal Of Anode Cap

    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 9: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a 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 10 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 11: 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 VOL.

  • Page 12: Before Making Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: CONSTANT VOLTAGE Read and perform these adjustments when repairing the Set condition is AV MODE without signal. circuits or replacing electrical parts or PCB assemblies. Connect the digital voltmeter to TP002. Adjust the VR502 until the digital voltmeter is 116 ±...
  • Page 13 ELECTRICAL ADJUSTMENTS 2-7: VERTICAL POSITION 2-11: TINT/COLOR CENT Receive the monoscope pattern. Receive the color bar pattern. (RF Input) Using the remote control, set the brightness and Connect the oscilloscope to TP806. Using the remote control, set the brightness, contrast, contrast to normal position.
  • Page 14 ELECTRICAL ADJUSTMENTS 2-12: OSD HORIZONTAL 2-14: CONTRAST MAX MANUAL Activate the adjustment mode display of Fig. 1-1. Receive the color bar pattern. (RF Input) Press the VOL. UP/DOWN button on the remote Using the remote control, set the brightness and contrast to normal position.

  • Page 15: Purity And Convergence Adjustments

    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 16: Electrical Adjustment Parts Location Guide (Wiring Connection)

    ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) VM COIL PCB CRT PCB CP852B CP804 CD803 CP803 J801 CP852 CP801_1 CP851_1 CD801 CP801A CP101 J702 J708 J704 J703 J701 CP851A FB401 CP401 T501 SPEAKER CD701B R527 CP502 L503 VR502 CP501 TP002...

  • Page 17: Block Diagram

    BLOCK DIAGRAM SPEAKER SPEAKER SP1001 SP1002 TU001 MICON IC101 OEC7074A HEAD PHONE JACK SOUND AMP IC1001 AN5276 YUV IN CHROMA IC IC201 TB1253N 24 25 43 44 IC301 NJM2150AM 18 19 V OUT SOUND DECORDER IC902 AN5829S 21 22 TONE CONTROL IC303 10 SCL M62420SP...
  • Page 18 PRINTED CIRCUIT BOARDS MAIN (INSERTED PARTS) SOLDER SIDE W006 CP801A W826 D411 J702 CP101 J701 J703 J704 D407 J708 W158 C427 L703 W801 CD701A CP851A R734 W850 W065 W813 C418 W064 IC701 W063 CP401 C004 W096 L402 L701 D605 TP004 W094 W001 W092...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN (CHIP MOUNTED PARTS) SOLDER SIDE Q705 R737 IC198 R104 R731 Q704 R510 Q1503 R1507 R1506 C336 C554 R155 R319 R1504 C334 R532 C928 Q509 R111 R324 C1514 C926 C330 C333 R303 R146 R327 IC1501 R905 C306 R140 IC101 R904...

  • Page 20: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS CRT/VM COIL SOLDER SIDE TP806 W804 R808 D804 Q810 TP804 R801 R804 D805 W006 R809 R806 TP805 R812 R802 Q853 Q812 Q811 C805 Q851 R819 R814 Q852 IC851 Q854 R859 C857 D855 R872 R877 W802 Q857 CP803 R866 D854 C859...
  • Page 21 MICON / TUNER SCHEMATIC DIAGRAM (MAIN PCB) OS101 RPM7138-H5 ACCESORY TU001 ENV56DB6G3 TEST POINT CP101 BT001 173979-7 R03(AB)E_20_T R003 I2C_SCL TM101 BT002 SBKMOP006B 330K I2C_SDA R111 R03(AB)E_20_T I2C_OFF H-BUFFER Q102 2SC2412K C003 RED LED V-BUFFER Q101 POWER ON 2SC2412K D109 SLR-342VCT32 FROM/TO CHROMA/IF MICON IC...

  • Page 22: Chroma / If Schematic Diagram

    CHROMA / IF SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO AV C_V_OUT_SW Y_V_OUT_SW FROM/TO MICON/TUNER TUNER_VIDEO R214 SYNC_OUT TUNER_AUDIO_L AUDIO TUNER_AUDIO_R BUFFER C213 Q201 2SC2412K OSD_B OSD_G C615 R608 OSD_R C212 1/4W W820 FROM/TO AV R205 TV BUFFER 0.01 B OSD_BLK Q202 TV BUFFER CD701B 2SC2412K...

  • Page 23: Deflection Schematic Diagram

    DEFLECTION SCHEMATIC DIAGRAM (MAIN PCB) V.OUTPUT IC401 AN5522 THERMAL PROTECTION PUMP UP 25.0 12.0 25.0 R407 5.6K C411 R414 500V FROM/TO DY 39K +-1% R417 33K V801 CP401 A51LVV896X07(O) B06B-DVS C418 FROM POWER 250V 0.39 P.CON+5V H_CTL Q407 HS402 P.CON+9V 2SC2412K 763WAA0216 L402...

  • Page 24: Power Schematic Diagram

    POWER SCHEMATIC DIAGRAM 6.3A 125V (MAIN PCB) CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE 6.3A 125V(F501) ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 6.3A 125V(F501) TO DIGITAL COMBI D516 RELAY DRIVE...
  • Page 25 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM AV R314 SW_AUDIO_R 6.8K R324 C334 SW_AUDIO_L 1.8K 0.033 B C332 R326 C331 0.47 B 100 1/4W 0.022 R328 1.8K TONE 136K R301 C306 R303 C308 AMP1 I2C BUS INTERFACE 0.0033 0.033 SIMAMP1 VOLAMP1 6.5K 6.5K 6.5K...
  • Page 26 AV SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO CHROMA/IF CD701A CH243001 YUV_IN(REAR) J704 MSP-213V1-652 PBSN A/V_OUT(REAR) J708 MSP-213V2-432 PBSN LINE2(REAR) J703 FROM POWER MSP-213V2-432 PBSN L703 P.CON+9V 47uH 0305 C713 R751 C714 R752 FROM/TO COMB C715 SW_VIDEO_OUT R713 LINE1(REAR) J701 C705 Y_V_OUT_COMB BUFFER MSP-213V2-432 PBSN Q709...
  • Page 27 DIGITAL COMB FILTER SCHEMATIC DIAGRAM (MAIN PCB) L1505 L1511 15uH 15uH C1523 0305 0305 120P CH 8.78 3.80 8.15 BUFFER W852 C1513 4.92 2.77 BUFFER BUFFER 1.58 Q1503 Q1505 Q1506 2SC2412K 2SC2412K 0.1 B 2.14 2SA1037AK R1521 C1535 C1519 R1515 1K 1/4W NTSC 3LINE COMB FILTER IC IC1501...
  • Page 28 CRT/VM COIL SCHEMATIC DIAGRAM (CRT/VM COIL PCB) PCB110 TCA391 TP804 R828 2.7K 1/4W RED AMP Q801 123.5 R813 2SC2621 220 1/4W D801 VM+12V IC 1SS133 RED AMP IC851 Q810 R801 KIA78L12BP-AT KTC3199_Y 1001/4W 1.8K 1/4W FROM DEFLECTION FROM DEFLECTION R810 CP801_1 CP851_1 A2001WV2-10P...
  • Page 29 WAVEFORMS MICON/TUNER 1 1V 0.1 s/div 1V 20 s/div 11 0.5V 20 s/div 2 1V 1 s/div 7 1V 20 s/div 12 1V 2 s/div 0.5V 10ms/div 3 1V 50 s/div 13 1V 20 s/div 4 1V 0.1ms/div 9 1V 50 s/div 14 2V 20 s/div CHROMA/IF 10 2V 20 s/div...
  • Page 30 WAVEFORMS DEFLECTION 16 2V 5ms/div 21 200V 50 s/div 26 5V 2ms/div SOUND 27 5V 2ms/div 22 2V 5ms/div 17 20V 5ms/div 18 10V 10ms/div 23 2V 5ms/div 28 200mV 20 s/div 19 20V 20 s/div 24 2V 5ms/div 29 200mV 20 s/div 20 2V 20 s/div 25 2V 5ms/div 30 2V 20 s/div...
  • Page 31 WAVEFORMS 31 1V 50 s/div 38 50V 20 s/div 39 50V 20 s/div 32 2V 5ms/div 33 2V 5ms/div 34 0.5V 20 s/div CRT/SVM 37 50V 20 s/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 32: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) PCB060 (VM COIL PCB) L503 FB401 V801 SP1002 TU001 PCB010 (MAIN PCB) SP1001...

  • Page 33: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AD301054 A3K6040720 CABINET,FRONT ASSY AD301055 726000A027 SHEET,CRT AD300448 801JRO0002 DAMPER,MD BZ710260 899HV3T000 HOLDER,ANODE WIRE AD301113 723000B873 FILM,DECORATION AD301056 A3K6040740 CABINET,BACK ASSY AD300007 7230006755 SHEET,CAUTION (FOR USA) AD300132 7230006818 SHEET,CAUTION (FOR CANADA) AD300008 701WPJ0997 CABINET,FRONT...

  • Page 34: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description RESISTORS ! R001 AD300656 R002T2683J 68K OHM 1/2W ! R410 BZ210087 R3X18A221J R,METAL OXIDE 220 OHM 2W ! R413 AD300037 R4X5T6153F R,METAL 15K OHM 1/6W ! R414 AD301011 R4X5T6393F R,METAL...
  • Page 35 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description DIODES ! D411 AD300075 D28TELS6N6 DIODE,RECTIFER 10ELS6N-TA1B2 D414 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC D415 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC D416 AD300075 D28TELS6N6 DIODE,RECTIFER 10ELS6N-TA1B2 ! D501 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC ! D502...
  • Page 36 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description TRANSISTORS Q103 BZ510071 TNAAB05003 COMPOUND TRANSISTOR KRC102SRTK Q109 BZ510002 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S Q201 BZ510002 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S Q202 BZ510002 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S Q203 BZ510001 T6YJ1037K0 TRANSISTOR,SILICON 2SA1037AKT146R,S...
  • Page 37 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description COILS &TRANSFORMERS ! T501 AD301034 048140066S TRANSFORMER,SWITCHING 8140066S JACKS J701 AD301038 060J431019 RCA JACK MSP-213V2-432 PBSN J702 AD300108 063Q700002 JACK YKF51-5503 J703 AD301038 060J431019 RCA JACK MSP-213V2-432 PBSN J704 AD301037...
  • Page 38 ELECTRICAL REPLACEMENT PARTS LIST RESISTOR RC....CARBON RESISTOR CAPACITORS CC....CERAMIC CAPACITOR CE....ALUMI ELECTROLYTIC CAPACITOR CP....POLYESTER CAPACITOR CPP....POLYPROPYLENE CAPACITOR CPL....PLASTIC CAPACITOR CMP....... METAL POLYESTER CAPACITOR CMPL....METAL PLASTIC CAPACITOR CMPP....METAL POLYPROPYLENE CAPACITOR...
  • Page 39 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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