Toshiba 20AF41C Service Manual
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Toshiba 20AF41C Service Manual

Toshiba 20AF41C Service Manual

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TOSHIBA
FILE NO.050-200102
SERVICE MANUAL
COLOR TELEVISION
20AF41C
DOCUMENT CREATED IN JAPAN, DEC., 2001

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Summary of Contents for Toshiba 20AF41C

  • Page 1 TOSHIBA FILE NO.050-200102 SERVICE MANUAL COLOR TELEVISION 20AF41C DOCUMENT CREATED IN JAPAN, DEC., 2001...

  • 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 G-1.Outline of the Product inch( 508.0 mmV):Measured diagonally Color CRT degree deflection G-2.Broadcasting System System G-3.Color System NTSC SECAM or Monochrome signal G-4.NTSC Playback(PAL 60Hz) G-5.NTSC 3.58+4.43/PAL60Hz G-6.Antenna Input Impedance VHF/UHF 75 ohm unbalanced G-7.Tuner and Receiving Contactless Electric tuner 1Tuner System 2Tuner System channel Tuner...
  • Page 4 GENERAL SPECIFICATIONS G-18.Regulation Safety NEMKO FEMKO DEMKO IEC65 SEMKO HOMOLO SABS SISIR AS3159 DENTORI GOST NONE Radiation SABA HOMOLO CISPR13 DENTORI AS/NZS NONE X-Radiation DHHS DENTORI NONE G-19.Temperature Operation ºC~ 40 ºC Storage ºC~ 60 ºC G-20.Operating Humidity Less than G-21.Clock and Timer Sleep Timer Yes Max 120...
  • Page 5 GENERAL SPECIFICATIONS G-26.OSD Language OSD Language Setting Not Applicable G-27.Speaker P o s itio n Front Side Bottom Size 2x4.7 inches 8 ohm x Power Max 2.5 + 2.5 W 10% 2.0 + 2.0 W (Typical) G-28.EXT Speaker G-29.Carton Master Carton: Need No Need Content:...
  • Page 6 Auto CH Memory Anti-Theft Just Clock Function Hotel Lock Rental Game Position Closed Caption Memory ( Last CH Last Vol.) Stable Sound V-Chip(Toshiba Type) CH LAVEL Favorite CH VM Circuit G-32.Switch Front Power(Tact) Channel Up Volume Up System Select Channel Down...

  • Page 7: 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 8: 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 9: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 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 111 ±...
  • Page 10 ELECTRICAL ADJUSTMENTS 2-7: HORIZONTAL SIZE 2-12: CORNER CORR TOP NOTE: Adjust after performing adjustments in section 2-6. Receive the crosshatch signal from the Pattern Generator. Receive the monoscope pattern. Using the remote control, set the brightness and Using the remote control, set the brightness and contrast to normal position.
  • Page 11 ELECTRICAL ADJUSTMENTS 2-16: SEPARATION 1, 2 2-19: SUB TINT/SUB COLOR Receive the stereo signal (L=2KHz, R=400Hz). Receive the color bar pattern. (RF Input) Connect the AC voltmeter to AUDIO OUT JACK though Connect the synchro scope to TP806. stereo filter (L=400Hz, R=2KHz). Activate the adjustment mode display of Fig.

  • Page 12: Purity And Convergence

    ELECTRICAL ADJUSTMENTS 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. minutes before performing the following adjustments.

  • Page 13: Major Components Location Guide

    MAJOR COMPONENTS LOCATION GUIDE VR502 T501 TP002 TP001 FB401 J702 FOCUS VOLUME SCREEN VOLUME MAIN PCB TP806 TP804 J801 CRT PCB...

  • Page 14: Block Diagram

    BLOCK DIAGRAM SPEAKER SPEAKER SP351 SP352 TU001 MICON IC101 OEC7054A HEAD PHONE JACK SOUND AMP IC353 AN5276 YUV IN IF/CHROMA/AUDIO IC201 TB1253N B BE 24 25 43 44 IC301 NJM2150AM 18 19 V OUT IC902 AN5829S TONE CONTROL IC303 10 SCL M62420SP COMB FILTER IC901...
  • Page 15 PRINTED CIRCUIT BOARDS MAIN (INSERTED PARTS) SOLDER SIDE CP801A C430 W143 CP101 C427 Q404 J702 R441 J701 J704 J703 J705 CD701A C715 C428 C747 W110 L703 CP851A W033 HS401 W845 C745 C739 W032 TP003 C743 C738 C744 L401 C740 C004 C784 IC701 CP401...
  • Page 16 PRINTED CIRCUIT BOARDS MAIN (CHIP MOUNTED PARTS) SOLDER SIDE C120 Q705 Q704 R104 R322 R110 C336 R319 R510 R125 C334 C928 C967 R324 R108 R119 R121 C926 C330 C333 C966 R504 C130 R303 R327 R525 C306 R905 Q101 R904 IC902 R301 Q102 R140...
  • Page 17 PRINTED CIRCUIT BOARDS CRT/VM COIL (INSERTED PARTS) COMB FILTER (INSERTED PARTS) SOLDER SIDE SOLDER SIDE IC903 R881 S851 S852 CP852_1 W008 R868 B853 L905 Q856 L902 R901 D853 R876 C859 D854 R866 CP803 Q857 COMB. R969 W802 W004 R930 W003 R877 R872 W002...
  • Page 18 PRINTED CIRCUIT BOARDS CRT (CHIP MOUNTED PARTS) COMB FILTER (CHIP MOUNTED PARTS) SOLDER SIDE SOLDER SIDE Q912 R947 Q901 C958 Q911 Q905 R809 R919 Q910 Q909 R959 C955 R953 R938 Q907 R949 R944 C963 Q908 R812 R943 C960 R937 R926 R924 R941 Q904...
  • Page 19 MICON / TUNER SCHEMATIC DIAGRAM (MAIN PCB) OS101 TU001 NJH3022U268 ACCESORY PIC-23143SY2 BT001 R03(AB)E_20_T TM101 BT002 SBKMOP006A R03(AB)E_20_T C007 0.01 B TP001 FROM/TO CHROMA/IF H-BUFFER C003 Q102 R.OUT 2SC2412K RED LED V-BUFFER POWER ON Q101 D109 2SC2412K R139 MICON OSD_R SLR-342VCT32 IC101 OEC7054A...
  • Page 20 CHROMA / IF SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO AV C.OUT S802Y Y.OUT FROM/TO MICON/TUNER W842 R214 SYNC_OUT TUNER_VIDEO W840 AUDIO BUFFER C213 Q201 OSD_B 2SC2412K FROM/TO AV OSD_G R608 C615 270 1/4W OSD_R CD701B CH244001 OSD_BLK C212 R.OUT R205 TV BUFFER 0.1 B Q202 TV BUFFER...
  • Page 21 DEFLECTION SCHEMATIC DIAGRAM (MAIN PCB) V.OUTPUT IC401 LA78040 THERMAL PROTECTION PUMP UP 25.0 12.0 25.0 R407 5.6K 1/4W BUFFER Q401 C411 BUFFER 2SA1015Y Q403 R414 500V R401 2SA1015Y TO DY 27K +-1% R417 33K CP401 V801 B06B-DVS-L L401 A51LSH196X07(O) ELC16B501EN R423 1 2W C418...

  • Page 22: Power Schematic Diagram

    POWER SCHEMATIC DIAGRAM (MAIN PCB) CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE 6.3A 125V(F501). 6.3A 125V ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 6.3A 125V(F501). D516 RELAY DRIVE Q504...
  • Page 23 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO AV R314 AUDIO_R 6.8K R324 C334 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 24 AV SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO CHROMA/IF CD701A CH244001 YUV_IN(REAR) J704 JPJ4311-011852 A/V_OUT(REAR) J705 JPJ4312-01-432 C713 R751 C714 R752 C715 R755 LINE1(REAR) J701 JPJ4312-01-432 FROM/TO POWER L703 P.CON+9V 47uH GND_SIGNAL C705 BUFFER Q709 KANP 2SA1037AK LINE2(REAR) J703 JPJ4312-01-432 AV SW IC701 MM1311AD FROM/TO CHROMA/IF...
  • Page 25 COMB FILTER SCHEMATIC DIAGRAM (COMB FILTER PCB) FROM/TO AV CP901 6035B-06Z002-T L912 R929 C946 15uH 50V KA L910 R964 15uH C968 R923 L904 BUFFER W809 W805 BUFFER BUFFER VIDEO Q906 Q903 Q904 22uH 2SC2412K 2SA1037AK 2SA1037AK Q907 2SC2412K Q909 CP902 2SA1037AK 6035B-03Z002-T R940...
  • Page 26 CRT / SVM SCHEMATIC DIAGRAM PCB110 TCX341 (CRT PCB) TP804 R828 2.7K 1/4W RED AMP Q801 123.5 R813 2SC2621 D801 1SS133 RED AMP Q810 R801 2SC1740SP VM+12V 100 1/4W IC851 FROM DEFLECTION R810 KIA78L12BP-AT CP802 52147-0710 1.8K R816 P.CON+9V 220 1/4W G.OUT R.OUT TP805...
  • Page 27 WAVEFORMS MICON/TUNER 1 1V 0.1µs/div 1V 20µs/div 11 0.5V 20µs/div 2 1V 1µs/div 7 1V 20µs/div 12 1V 2µs/div 0.5V 10ms/div 3 1V 50µs/div 13 1V 20µs/div 4 1V 0.1ms/div 9 1V 50µs/div 14 2V 20µs/div CHROMA/IF 10 2V 20µs/div 5 1V 50µs/div 15 2V 20µs/div NOTE:...
  • Page 28 WAVEFORMS DEFLECTION 16 2V 5ms/div 21 200V 50µs/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 20µs/div 19 20V 20µs/div 24 2V 5ms/div 29 200mV 20µs/div 20 2V 20µs/div 25 2V 5ms/div 30 2V 20µs/div NOTE:...

  • Page 29: Comb Filter

    WAVEFORMS 31 1V 50µs/div 36 1V 5ms/div 37 50V 20µs/div 32 2V 5ms/div 38 50V 20µs/div 33 2V 5ms/div COMB FILTER 34 0.5V 20µs/div 39 50V 20µs/div 35 1V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 30: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) PCB060 (VM COIL PCB) L503 FB401 V801 TU001 PCB010 (MAIN PCB) SP352 PCB330 (COMB PCB) SP351...

  • Page 31: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AD300131 A3I707Q720 CABINET,FRONT ASSY AD300002 763WAA0181 HEAT SINK AD300003 763WAA0200 HEAT SINK AD300004 763WAA0214 HEAT SINK AD300005 763WAA0215 HEAT SINK AD300006 763WAA0216 HEAT SINK AD300132 7230006818 SHEET,CAUTION AD300008 701WPJ0997 CABINET,FRONT AD300009 713WPA0134 GUIDE,REMOCON...

  • Page 32: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location NO. TSB P/N Reference NO. Description RESISTORS ! R001 BZ210008 R3X181273J R,METAL OXIDE 27K OHM 1W ! R410 AD300034 R5X2CE222J R,CEMENT 2.2K OHM 7W ! R411 AD300032 R6558AR39J R,FUSE 0.39 OHM 2W R416 AD300040 R3X18A2R2J R,METAL OXIDE 2.2 OHM 2W ! R418...
  • Page 33 ELECTRICAL REPLACEMENT PARTS LIST Location NO. TSB P/N Reference NO. Description DIODES D402 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC D404 BZ410023 D97U09R11B DIODE,ZENER MTZJ9.1B T-77 ! D405 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC ! D406 AD300071 D97U01101B DIODE,ZENER MTZJ11B T-77 ! D407 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC ! D408...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST Location NO. TSB P/N Reference NO. Description TRANSISTORS Q204 AD300030 T83A028140 TRANSISTOR,SILICON 2SC2814(F3,F4)-T Q351 BZ510022 TNYJJ05001 COMPOUND TRANSISTOR DTC114TKAT146 Q401 BZ510034 TA5T010154 TRANSISTOR,SILICON 2SA1015Y(TPE2) ! Q402 BZ510027 TC3Q026210 TRANSISTOR,SILICON 2SC2621(D,E)-RAC Q403 BZ510034 TA5T010154 TRANSISTOR,SILICON 2SA1015Y(TPE2) Q404 AD300027 TC30041590 TRANSISTOR,SILICON 2SC4159(D,E)
  • Page 35 ELECTRICAL REPLACEMENT PARTS LIST Location NO. TSB P/N Reference NO. Description COILS &TRANSFORMERS L909 BZ310043 021LA6150K COIL L910 BZ310043 021LA6150K COIL L912 BZ310043 021LA6150K COIL T401 BZ310072 045013001J TRANS,HORIZONTAL DRIVE 5013001 ! T501 AD300115 0481400614 TRANSFORMER,SWITCHING 81400614 JACKS ! J351 BZ614144 0602131011 HEADPHONE JACK HSJ2000-01-010...
  • Page 36 ELECTRICAL REPLACEMENT PARTS LIST Location NO. TSB P/N Reference NO. Description MISCELLANEOUS ! TH501 AD300068 DF40B3R0Q0 DEGAUSS ELEMENT PTBD14K2-3R0Q141 TM101 AD300091 07660DU010 TRANSMITTER SBKMOP006A ! TU001 AD300124 0145W00052 TUNER,VHF-UHF NJH3022U268 ! V801 AD300089 098W200487 CRT W/DY A51LSH196X07(O) X101 AD300088 1002T00802 CERAMIC OSCILLATOR CSTS0800MG03-T2 X601...
  • Page 37 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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