Toshiba 20AF46 Service Manual
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Toshiba 20AF46 Service Manual

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SERVICE MANUAL

COLOR TELEVISION
The above model is classified as a green product (*1), as indicated by the underlined serial number.
This Service Manual describes replacement parts for the green product. When repairing this green
product, use the part(s) described in this manual and lead-free solder (*2).
For (*1) and (*2), see the next page.
FILE NO. 050-200601GR
20AF46
20AF46C
DOCUMENT CREATED IN JAPAN, January, 2006 GREEN
(MFR'S VERSION B)

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  • Page 1: Service Manual

    (MFR’S VERSION B) SERVICE MANUAL COLOR TELEVISION 20AF46 20AF46C The above model is classified as a green product (*1), as indicated by the underlined serial number. This Service Manual describes replacement parts for the green product. When repairing this green product, use the part(s) described in this manual and lead-free solder (*2).

  • Page 2: Green Product Procurement

    Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any marketing of new products containing the restricted substances. Increasing attention is given to issues related to the global environmental. Toshiba Corporation recognizes environmental protection as a key management tasks, and is doing its utmost to enhance and improve the quality and scope of its environmental activities.

  • Page 3: 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.) 20AF46/20AF46C A1-2...

  • Page 4: Table Of Contents

    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 20AF46/20AF46C 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 20AF46...
  • 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 20AF46...
  • 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 20AF46...
  • Page 8 Features Auto Degauss Auto Shut Off Canal+ Cable 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 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 Environmental standard requirement Green procurement of TOSHIBA Pb-free Phase3(Phase3A) A3-5 20AF46...
  • 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/Cable 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+ Cable 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 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 Environmental standard requirement Green procurement of TOSHIBA Pb-free Phase3(Phase3A) A3-10 20AF46C...

  • 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 20AF46/20AF46C...

  • 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 20AF46/20AF46C...
  • 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 20AF46/20AF46C...

  • Page 18: Service Mode List

    After the confirmation of using hours, turn off the power. POWER ON total hours. CRT ON 0010 = (16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) FIG. 1 + (ones digit value) 20AF46/20AF46C...

  • Page 19: When Replacing Eeprom (Memory) Ic

    Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 1 second. 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. 20AF46/20AF46C...

  • Page 20: Electrical Adjustments

    Adjust the Focus Volume until picture is distinct. VS CORRECTION CR DL R DRIVE CB PED B DRIVE CR PED R CUT OFF PARABOLA G CUT OFF CORNER B CUT OFF TRAPWZIUM BRIGHT MAX LEVEL BRIGHT CENT SEPARATION1 BRIGHT MIN SEPARATION2 Fig. 1-2 20AF46/20AF46C...
  • Page 21 Press the TV/VIDEO button on the remote control to set to the AV mode. Then perform the above adjustments 1~3. Press the TV/VIDEO button on the remote control to set to the CS mode. Then perform the above adjustments 1~3. 20AF46/20AF46C...
  • Page 22 2~4. H.SIZE Press the VOL. UP/DOWN button on the remote control VS CORRECTION until the color step No. becomes "66". BRI.MAX BRI.MIN CONT.CENT CONT.MIN COL.MAX COL.MIN SHARPNESS 120% CB DL CR DL PARABOLA CORNER TRAPEZIUM white 100% Fig. 2-2 20AF46/20AF46C...

  • Page 23: Purity And Convergence

    Confirm red and blue color. 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 20AF46/20AF46C...
  • 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 20AF46/20AF46C...

  • Page 25: Block Diagram

    CH DOWN 26 SDA KEY2 27 SCL VOL UP SOUND DECORDER IC IC902 AN5829S-E1V CH UP SPEAKER SP1001 MEMORY IC SPEAKER IC199 SP1002 BR24L16FJ-WE2 FRONT-AUDIO.R FRONT-AUDIO.L J707 J706 HEADPHONE_JACK J1001 TONE CONTROL IC SOUND AMP IC302 IC1001 AN5891SA-E1V AN7522N 20AF46/20AF46C...

  • Page 26: Printed Circuit Boards Main/Crt

    R133 W830 L501 R515 D105 W125 L301 W180 W176 C505_1 CP501 W049 W174 X101_1 CCE011B W118 CP1001 W050 FH502 FH501 R1013 L901 W121 C108 R301 F501 R1012 R120 SW105 SW103 SW104 SW101 SW102 J707 R102 J705 J706 C916 D109 20AF46/20AF46C...
  • Page 27 MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE Q101 IC199_1 R109 CCE011B IC902 IC302 IC101 R114 Q1502 R125 R814 Q103 R810 Q1505 CME017B R821 R641 R145 R1502 R652 R636 R632 R653 IC1501 Q1501 R627 Q1507 IC1503 R1514 IC1502 R513 R516 R736 R404 R725 20AF46/20AF46C...
  • Page 28 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 WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. 20AF46/20AF46C...
  • Page 29 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 20AF46/20AF46C...
  • Page 30 DESCRIBED IN PARTS LIST ONLY IS NON POLAR ONE. N’UTILISER QUE CELLS DECRITES NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED DANS LA NOMENCLATURE DES PIECES WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. 20AF46/20AF46C...
  • Page 31 NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED ATTENTION :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. 20AF46/20AF46C...
  • Page 32 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. DESCRIBED IN PARTS LIST ONLY N’UTILISER QUE CELLS DECRITES DANS LA NOMENCLATURE DES PIECES 20AF46/20AF46C G-10...
  • Page 33 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 20AF46/20AF46C G-11 G-12...
  • Page 34 NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED 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. 20AF46/20AF46C 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. DESCRIBED IN PARTS LIST ONLY N’UTILISER QUE CELLS DECRITES DANS LA NOMENCLATURE DES PIECES 20AF46/20AF46C G-15 G-16...

  • Page 36: Micon

    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. 20AF46/20AF46C...

  • Page 37: Comb Filter/Av

    27 0.5V 1ms/div COMB FILTER/AV 23 2V 5ms/div 28 200mV 20µs/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. 20AF46/20AF46C...

  • 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 20AF46/20AF46C...
  • Page 39 MECHANICAL EXPLODED VIEW (PACKING DIAGRAM) 120, 121, 122, TM101 20AF46/20AF46C...

  • Page 40: Mechanical Replacement Parts List

    810763080U SCREW TAP TITE(S) BRAZIER 3*8 CH 72798789 8109I30A0U SCREW TAP TITE(B) WH7 3*10 CH 72781251 810963080Q SCREW TAP TITE(B) BRAZIER 3*8 STAINLESS 72781255 8109I3080U SCREW TAP TITE(B) WH7 3*8 CH 72781295 8162540A6U SCREW TAPPING (BO) WASHER 18 J1-1 20AF46...
  • Page 41 MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description 72781165 7A701A423A FRONT CABI ASS'Y 101A 72799331 701WPJD026 CABINET FRONT 101B 72782969 711WPA0184 PLATE FRONT 101C 72782972 713WPA0263 GLASS LED 101D 72799677 7235490049 BADGE BRAND 101E 72783010 735WPA0728 STOPPER BUTTON 1 101F 72794719 735WPA0732...

  • Page 42: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R402 72781748 R638U2680J R,FUSE OHM 1/2W ! R410 72795508 R3X18A151J R,METAL OXIDE 150 OHM 2W ! R416 72797795 R002T23R3J 3.3 OHM 1/2W ! R420 72794682 R002T22R7J 2.7 OHM 1/2W ! R426 72794599 R4X5T4472F...
  • Page 43 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES D509 72795541 D97U01801B DIODE,ZENER MTZJ18B T-77 ! D510 72794475 D2CF2016L0 DIODE,SILICON FE201-6L49 ! D511 72794483 D2WXN49370 DIODE,SILICON 1N4937 ! D512 72794480 D28T21DQN9 DIODE,SCHOTTKY 21DQ09N-TA2B1 D513 72794491 D1VT001330 DIODE,SILICON 1SS133T-77 D514 72794491...
  • Page 44 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description COILS &TRANSFORMERS L402 72794528 022100027A COIL,LINEARITY ELH5L4113 ! L501 72796630 029T000097 COIL,LINE FILTER 1R5A123F28Y ! L503 72795933 028R200024 COIL,DEGAUSS 8R200024 L901 72794540 02167F101J COIL 100 UH L1501 72794540 02167F101J COIL 100 UH L1503...
  • Page 45 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 J2-4 14AF46...
  • Page 46 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R402 72781748 R638U2680J R,FUSE OHM 1/2W ! R410 72795508 R3X18A151J R,METAL OXIDE 150 OHM 2W ! R416 72797795 R002T23R3J 3.3 OHM 1/2W ! R420 72794682 R002T22R7J 2.7 OHM 1/2W ! R426 72794599 R4X5T4472F...
  • Page 47 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES D509 72795541 D97U01801B DIODE,ZENER MTZJ18B T-77 ! D510 72794475 D2CF2016L0 DIODE,SILICON FE201-6L49 ! D511 72794483 D2WXN49370 DIODE,SILICON 1N4937 ! D512 72794480 D28T21DQN9 DIODE,SCHOTTKY 21DQ09N-TA2B1 D513 72794491 D1VT001330 DIODE,SILICON 1SS133T-77 D514 72794491...
  • Page 48 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description COILS &TRANSFORMERS L402 72794528 022100027A COIL,LINEARITY ELH5L4113 ! L501 72796630 029T000097 COIL,LINE FILTER 1R5A123F28Y ! L503 72795933 028R200024 COIL,DEGAUSS 8R200024 L901 72794540 02167F101J COIL 100 UH L1501 72794540 02167F101J COIL 100 UH L1503...
  • Page 49 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 J2-8 14AF46C...
  • Page 50 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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