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Toshiba 20AF45 Service Manual
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Toshiba 20AF45 Service Manual

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FILE NO. 050-200504
(MFR'S VERSION A)

SERVICE MANUAL

COLOR TELEVISION
20AF45
20AF45C
DOCUMENT CREATED IN JAPAN, February, 2005

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  • Page 1: Service Manual

    FILE NO. 050-200504 (MFR’S VERSION A) SERVICE MANUAL COLOR TELEVISION 20AF45 20AF45C DOCUMENT CREATED IN JAPAN, February, 2005...

  • Page 2: Servicing Notices On Checking

    When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of the heat sink. Befor applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor.) 20AF45/20AF45C A1-1...

  • Page 3: About Lead Free Solder (Pbf)

    When soldering or unsoldering, completely remove all of the solder from the pins or solder area, and be sure to heat the soldering points with the lead free solder until it melts sufficiently. Recommendations Recommended lead free solder composition is Sn-3.0Ag-0.5Cu. A1-2 20AF45/20AF45C...

  • Page 4: Table Of Contents

    SOUND ............................ G-9, G-10 TUNER/STEREO ........................G-11, G-12 COMB/FILTER/AV ........................G-13, G-14 CRT ............................G-15, G-16 WAVEFORMS ..........................H-1, H-2 MECHANICAL EXPLODED VIEWS ................... I-1, I-2 MECHANICAL REPLACEMENT PARTS LIST ................. J1-1, J1-2 ELECTRICAL REPLACEMENT PARTS LIST ................J2-1~J2-8 20AF45/20AF45C A2-1...

  • Page 5: General Specifications

    W at AC 120 V 60 Hz Per Year kWh/Year Protector Power Fuse Safety Circuit IC Protector(Micro Fuse) Regulation Safety Radiation X-Radiation DHHS Temperature Operation +5oC ~ +40oC Storage -20oC ~ +60oC Operating Humidity Less than 80% RH A3-1 20AF45...
  • Page 6 V-chip Rating 16: 9 OSD Language English French Spanish Clock and Sleep Timer Max Time 120 Min Timer Step On/Off Timer Program(On Timer / Off Timer / Clock) Wake Up Timer Timer Back-up (at Power Off Mode) more than A3-2 20AF45...
  • Page 7 CH RTN(Quick View) Sleep RECall(Call) Reset Menu/Enter Mute Exit MTS(Audio Select) Fav.Up Fav.Down 16: 9 Multi Brand Keys CH Up(VCR) CH Down(VCR) Pause/Still TV/VCR(VCR) Play Stop Cable CODE DVD MENU < DVD MENU > DVD CLEAR TOP MENU DVD MENU A3-3 20AF45...
  • Page 8 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 9 Edges / 6 Surfaces Height (cm) 60 (ORION SPEC:46) Container Stuffing Sets/40' container G-17 Cabinet Material Cabinet Cabinet Front PS 94V0 DECABROM Cabinet Rear PS 94V0 DECABROM Non-Halogen Demand Eyelet Demand G-18 Environment Pb-free Soldering Parts Specification(Phase3 : based on RoHS) A3-5 20AF45...
  • Page 10 GENERAL SPECIFICATIONS CRT Size / Visual Size 20 inch / 508mmV System CRT Type Flat 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) NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System System M...
  • Page 11 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 Surround On/Off Set Up TV/CATV Auto CH Memory Add/ Delete Option Language CH Label Favorite CH V-Chip Lock On/Off Timer...
  • Page 12 GENERAL SPECIFICATIONS G-10 Remote Unit RC-GQ Control Glow in Dark Remocon Format Toshiba Remocon Format Toshiba Custom Code TV: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 13 GENERAL SPECIFICATIONS G-11 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type 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 14 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 = VIDEO2 Audio Input = VIDEO2 RCA x 2 Other Terminal...

  • Page 15: Disassembly Instructions

    Flip up the sides of the Rubber Cap in the direction of the arrow and remove one side of the support. (Refer to Fig. 1-2.) Rubber Cap Support Fig. 1-5 Support Confirm that the Support is securely connected. Fig. 1-2 Put on the Rubber Cap without moving any parts. B1-1 20AF45/20AF45C...

  • Page 16: Removal And Installation Of Flat Package Ic

    NOTE Do not move the Braided Shield Wire in the vertical direction towards the IC pattern. Blower type IC desoldering machine Braided Shield Wire Soldering Iron IC pattern Fig. 2-4 Fig. 2-2 B2-1 20AF45/20AF45C...
  • Page 17 Fig. 2-6 Absorb the solder left on the lead using the Braided Shield Wire. (Refer to Fig. 2-7.) NOTE Do not absorb the solder to excess. Soldering Iron Braided Shield Wire Fig. 2-7 B2-2 20AF45/20AF45C...

  • Page 18: Service Mode List

    Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds. After the finishing of the initializing of shipping, the unit will turn off automatically. The unit will now have the correct DATA for the new MEMORY IC. 20AF45/20AF45C...

  • Page 19: Electrical Adjustments

    VS CORRECTION CR DL Adjust the Focus Volume until picture is distinct. R DRIVE CB PED B DRIVE CR PED R BIAS PARABOLA G BIAS CORNER B BIAS TRAPWZIUM BRIGHT MAX LEVEL BRIGHT CENT SEPARATION1 BRIGHT MIN SEPARATION2 Fig. 1-2 20AF45/20AF45C...
  • Page 20 Press the VOL. UP/DOWN button on the remote control to adjust it until the L-ch output becomes minimum. The output difference of the between with Filter and without Filter should be more than 25db for both L and R. 20AF45/20AF45C...
  • Page 21 Place the set in AV mode. Then perform the above adjustments 2~6. Press the TV/VIDEO button on the remote control to set to the CS mode. Then perform the above adjustments 2~4. Press the VOL. UP/DOWN button on the remote control until the color step No. becomes "66". 20AF45/20AF45C...
  • Page 22 2-16: Confirmation of Fixed Value (Step No.) Please check if the fixed values of the each adjustment items are set correctly referring below. FUNCTION H.VCO AFC GAIN V.SHIFT H.SIZE VS CORRECTION BRI.MAX BRI.MIN CONT.CENT CONT.MIN COL.MAX COL.MIN SHARPNESS CB DL CR DL PARABOLA CORNER TRAPEZIUM 20AF45/20AF45C...

  • Page 23: Purity And Convergence

    Confirm red and blue color. WEDGE Adjust the slant of the deflection yoke while watching the screen, then tighten the fixing screw. WEDGE POSITION DEFLECTION YOKE Fig. 3-2-b DEFLECTION YOKE SCREW MAGNET SCREW PURITY MAGNETS 6 POLE MAGNETS 4 POLE MAGNETS Fig. 3-1 20AF45/20AF45C...
  • Page 24 CRT PCB CD803 CP803 TP024 R805 TP022 R803 J801 CP806 CP802B CP801B CP801A J702 CP101 J701 J704 FB401 TU001 TP004 VR401 W010 CP401 TP003 W003 VR502 CP802A CP502 CD1001 SPEAKER CP501 CP1001 J1001 J707 J705 J706 MAIN PCB AC IN 20AF45/20AF45C...

  • Page 25: Block Diagram

    CH DOWN 26 SDA J704 KEY2 27 SCL VOL UP SOUND DECORDER IC IC902 AN5829S CH UP SPEAKER SP1001 MEMORY IC SPEAKER IC199 SP1002 FRONT-AUDIO.R BR24L16FJ-WE2 FRONT-AUDIO.L J707 J706 HEADPHONE_JACK J1001 TONE CONTROL IC SOUND AMP IC302 IC1001 AN7522N AN5891SA-E1V 20AF45/20AF45C...

  • Page 26: Printed Circuit Boards Main/Crt

    W125 TP024 W180 L301 C316 L501 W176 CP501 TP022 W049 W174 X101_1 W118 CCE011A CP1001 C505_1 W050 L901 FH502 F501 FH501 R301 W121 C108 R1012 R1013 R120 SW101 SW102 SW105 SW103 SW104 C916 R102 J706 J1001 J707 J705 D109 20AF45/20AF45C...
  • Page 27 MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE IC199_1 Q101 R109 CCE011A IC902 IC302 IC101 R114 Q1502 R125 R814 Q103 R810 Q1505 R821 R641 R145 R1502 CME017A R652 R636 R632 R653 IC1501 Q1501 R627 Q1507 IC1503 R1514 IC1502 R513 R516 R736 R404 R725 20AF45/20AF45C...

  • Page 28: Micon

    NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. 20AF45/20AF45C...

  • Page 29: Chroma

    CRITICAL FOR SAFETY,USE ONES WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST DANGEREUSES AN POINT DE VUE SECURITE DESCRIBED IN PARTS LIST ONLY WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. N’UTILISER QUE CELLS DECRITES DANS LA NOMENCLATURE DES PIECES 20AF45/20AF45C...

  • Page 30: Deflection

    DANGEREUSES AN POINT DE VUE SECURITE THE ALUMI ELECTROLYTIC CAPACITOR MARKED NP CRITICAL FOR SAFETY,USE ONES WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. N’UTILISER QUE CELLS DECRITES DESCRIBED IN PARTS LIST ONLY IS NON POLAR ONE. DANS LA NOMENCLATURE DES PIECES 20AF45/20AF45C...

  • Page 31: Power

    NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED :POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST N’UTILISER QUE DES FUSIBLE DE MEME TYPE 6.3A 125V(F501) WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. 20AF45/20AF45C...

  • Page 32: Sound

    OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE DANGEREUSES AN POINT DE VUE SECURITE CRITICAL FOR SAFETY,USE ONES WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. N’UTILISER QUE CELLS DECRITES DESCRIBED IN PARTS LIST ONLY DANS LA NOMENCLATURE DES PIECES AUDIO SIGNAL 20AF45/20AF45C G-10...

  • Page 33: Tuner/Stereo

    DANGEREUSES AN POINT DE VUE SECURITE CRITICAL FOR SAFETY,USE ONES OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. N’UTILISER QUE CELLS DECRITES DESCRIBED IN PARTS LIST ONLY DANS LA NOMENCLATURE DES PIECES 20AF45/20AF45C G-11 G-12...
  • Page 34 NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED COLOR SIGNAL OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. TUNER VIDEO SIGNAL 20AF45/20AF45C G-13 G-14...
  • Page 35 OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE CRITICAL FOR SAFETY,USE ONES DANGEREUSES AN POINT DE VUE SECURITE WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. G.SIGNAL DESCRIBED IN PARTS LIST ONLY N’UTILISER QUE CELLS DECRITES DANS LA NOMENCLATURE DES PIECES B.SIGNAL 20AF45/20AF45C G-15 G-16...
  • Page 36 15 2V 20µs/div DEFLECTION 4 1V 0.1ms/div 11 0.5V 20µs/div 16 2V 5ms/div CHROMA 12 1V 2µs/div 7 1V 20µs/div 17 20V 5ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram. 20AF45/20AF45C...

  • Page 37: Comb/Filter/Av

    22 2V 5ms/div COMB/FILTER/AV 28 200mV 20µs/div 23 2V 5ms/div 21 200V 50µs/div 37 50V 20µs/div 29 200mV 20µs/div 24 2V 5ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram. 20AF45/20AF45C...

  • Page 38: Mechanical Exploded Views

    MECHANICAL EXPLODED VIEW 102B 102A 102B PCB110 (CRT PCB ASS'Y) 101I PCB010 101I (MAIN PCB ASS'Y) 101H 101F 101G 101I 101C 101E 101I 101G 101B 101D 101A 20AF45/20AF45C...
  • Page 39 MECHANICAL EXPLODED VIEW (PACKING DIAGRAM) 120, 121, 122, TM101 20AF45/20AF45C...

  • Page 40: Mechanical Replacement Parts List

    AE006235 8117140A2U SCREW,TAPPING(B0) PAN 4x12 AE003528 8110630A0U SCREW,TAP TITE(P) BRAZIER 3x10 AE003531 810763080U SCREW,TAP TITE(S) BRAZIER AE003524 8109I30A0U SCREW,TAP TITE(B) WH7 3x10 AE005917 810963080Q SCREW,TAP TITE(B) BRAZIER AE005659 8109I3080U SCREW,TAP TITE(B) WH7 AE005398 8162540A6U SCREW,TAPPING (BO) WASHER 18 J1-1 20AF45...
  • Page 41 MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AE006006 7A701A320A FRONT CABI ASS'Y 101A AE005742 701WPJC927 CABINET,FRONT 101B AD302006 711WPA0184 PLATE,FRONT 101C AD302007 713WPA0263 GLASS,LED 101D AD302008 7235490036 BADGE,BRAND 101E AD302009 735WPA0728 STOPPER,BUTTON 1 101F AD302010 735WPA0732 STOPPER,BUTTON2 101G AE006223...

  • Page 42: Electrical Replacement Parts List

    DIODE,SILICON 11E1-EIC ! D501 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC ! D502 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC ! D503 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC ! D504 BZ410062 D2WTRM11C0 DIODE,SILICON RM11C-EIC ! D505 AE006082 D28F0PRA60 DIODE,RECTIFIER 30PRA60-FC ! D506 AD300731 D2WXN49370 DIODE,SILICON 1N4937 J2-1 20AF45...
  • Page 43 TCATC3199Y TRANSISTOR,SILICON KTC3199_Y-AT ! Q802 BZ510100 TCATC3199Y TRANSISTOR,SILICON KTC3199_Y-AT ! Q803 BZ510100 TCATC3199Y TRANSISTOR,SILICON KTC3199_Y-AT ! Q804 BZ510009 TC3F042170 TRANSISTOR,SILICON 2SC4217(D,E)-RAC ! Q805 BZ510009 TC3F042170 TRANSISTOR,SILICON 2SC4217(D,E)-RAC ! Q806 BZ510009 TC3F042170 TRANSISTOR,SILICON 2SC4217(D,E)-RAC Q1501 BZ510001 T6YJ1037K0 TRANSISTOR,SILICON 2SA1037AKT146R,S J2-2 20AF45...
  • Page 44 BZ614422 081PC6R305 FUSE 51MS063L ! FB401 AE003174 043220060F TRANSFORMER,FLYBACK FJN20A002_M FH501 AE002634 06710T0009 HOLDER,FUSE EYF-52BCY FH502 AE002634 06710T0009 HOLDER,FUSE EYF-52BCY OS101 AD301048 0773071001 REMOTE RECEIVER RPM7138-WH5 ! RY501 AE006070 0560X20118 RELAY G5PA-1-SA(WEC) ! SP1001 AD301050 070C457003 SPEAKER SG05K07BRA J2-3 20AF45...
  • Page 45 X602 AD301653 100DT3R531 CRYSTAL HC-49/U 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 J2-4 20AF45...
  • Page 46 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R402 AE006221 R638U2680J R,FUSE OHM 1/2W ! R410 AD301344 R3X18A151J R,METAL OXIDE 150 OHM 2W ! R416 AD301593 R002T23R3J 3.3 OHM 1/2W ! R420 AD301345 R002T22R7J 2.7 OHM 1/2W ! R426 BZ210030 R4X5T4472F...
  • Page 47 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES D507 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D508 BZ410064 D97U03R91B DIODE,ZENER MTZJ3.9B T-77 D509 AD300671 D97U01801B DIODE,ZENER MTZJ18B T-77 ! D510 AD301980 D2CF2016L0 DIODE,SILICON FE201-6L49 ! D511 AD300731 D2WXN49370 DIODE,SILICON 1N4937 ! D512 BZ410010...
  • Page 48 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description TRANSISTORS Q1502 BZ510109 TCAA3875SY TRANSISTOR,SILICON KTC3875S_Y_RTK Q1505 BZ510109 TCAA3875SY TRANSISTOR,SILICON KTC3875S_Y_RTK Q1507 BZ510109 TCAA3875SY TRANSISTOR,SILICON KTC3875S_Y_RTK COILS &TRANSFORMERS L301 BZ310041 02167F101J COIL 100 UH L401 BZ310004 021679472K COIL 4.7 MH L402 BZ310063 022100027A...
  • Page 49 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description MISCELLANEOUS ! SP1002 AD301050 070C457003 SPEAKER SG05K07BRA ! TH501 AD302000 D8EE0B1400 DEGAUSS ELEMENT B59203-S1060-B14 TM101 AE006214 076N0GQ020 TRANSMITTER RC-GQ020 ! TU001 AE006069 0163300018 RF UNIT 115-V-KA35ARB ! V801 AE006215 0981210460 CRT W/DY A51LYZ095X81...
  • Page 50 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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