Toshiba 20A46C Service Manual
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Toshiba 20A46C Service Manual

Toshiba 20A46C 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. 050-200615GR
(MFR'S VERSION A)
20A46C
DOCUMENT CREATED IN JAPAN, March, 2006

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  • Page 1: Service Manual

    (MFR’S VERSION A) SERVICE MANUAL COLOR TELEVISION 20A46C 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

    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 4: Table Of Contents

    TABLE OF CONTENTS GREEN PRODUCT PROCUREMENT ..................A1-1 LEAD-FREE SOLDER ........................ A1-1 SERVICING NOTICES ON CHECKING ..................A1-2 HOW TO ORDER PARTS ......................A1-2 IMPORTANT ..........................A1-2 A2-1 TABLE OF CONTENTS ......................GENERAL SPECIFICATIONS ....................A3-1~A3-5 DISASSEMBLY INSTRUCTIONS B1-1 1. REMOVAL OF ANODE CAP ....................2.

  • Page 5: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 20 inch / 508.0mmV System CRT Type Normal 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) NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System System M System...
  • Page 6 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 7 GENERAL SPECIFICATIONS G-10 Remote Unit RC-EH Control Glow in Dark Remocon Format Toshiba 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...
  • Page 8 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 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 (by buyer) Green procurement of TOSHIBA Pb-free Phase3(Phase3A) A3-5...

  • Page 10: 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 11: 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 12 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 13: Service Mode List

    SERVICE MODE LIST This unit is 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 2 seconds. Set Key Remocon Key Operations VOL.

  • Page 14: 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. Place the set in AV MODE without signal. CAUTION Connect the digital voltmeter to the TP401. Adjust the VR502 until the digital voltmeter is 113 ±...
  • Page 15 ELECTRICAL ADJUSTMENTS 2-9: CONTRAST MAX 2-5: VERTICAL POSITION Receive the color bar pattern. (RF Input) Receive the monoscope pattern. Using the remote control, set the brightness and Using the remote control, set the brightness and contrast contrast to normal position. to normal position.
  • Page 16 ELECTRICAL ADJUSTMENTS 2-12: COLOR CENT 2-14: Confirmation of Fixed Value (step No.) Receive the color bar pattern. (RF Input) Please check if the fixed values of the each adjustment Using the remote control, set the brightness, contrast, items are set correctly referring below. color and tint to normal position.

  • Page 17: Purity And Convergence

    ELECTRICAL ADJUSTMENTS 3. 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.
  • Page 18 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP024 W883 CP806_1 TP022 W881 J801 CP803A CP601 J701 FB401 VR402 CP401 VR401 TU001 TP401 CRT DY CP1001 SPEAKER L503 DEGAUSS COIL S501B CP802A CD501 J1001 OS101 S501A J710 J711 J712...

  • Page 19: Block Diagram

    BLOCK DIAGRAM CH. DOWN MICON/CHROMA IC VOL. DOWN IC101 OEC7116B 24 26 CH. UP RGB Proc.2 VOL. UP OSD SW Q804 CONTRAST BRIGHTNESS RED AMP RGB OUTPUT Stage POWER DRIVE Chroma CUT OFF Q805 Proc. HV BLK ACC/C-BPF OS101 GREEN AMP APC/KILLER RGB Proc.1 TINT/DEMO...

  • Page 20: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE R611 W854 R429 D411 C407 CP601 CD803A CP803A W016 W004 J701 C420 C435 D410 R424 D407 R415 R410 W048 FB401 C406 R433 VR402 R606 W841 VR401 W045 R434 R450 W060 W054 R412 L401 C455_1 R513...
  • Page 21 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE Q105 R126 CCE021A R105 R616 IC199_1 R607 R610 R621 Q604 R911 R901 IC901_1 R135 R113 R131 R102 R129 R123 R115 IC903 IC902 Q1003 R1002 Q1001 R533 Q507 CME026A R003 R004...
  • Page 22 MICON/CHROMA/TUNER SCHEMATIC DIAGRAM ACCESSORY (MAIN PCB) UM-4 BT001 S813X MNAAA(R03) UM-4 TM101 Q604 BT002 R621 RC-EH030 2SC3052 MNAAA(R03) H.CTL Q607 KTC3198 R618 8.2K C115 FROM/TO DEFLECTION/CRT 100P R608 C118 R124 C114 CLAMP 1/4W R110 1/4W 6.3V 100P V_OUT C632 R109 10K 1/4W V_FEEDBACK AT+5V...
  • Page 23 DEFLECTION/CRT SCHEMATIC DIAGRAM (CRT PCB) (MAIN PCB) CP802A B2013H02-5P CP802B B2013H02-5P FROM/TO MICON/CHROMA/TUNER CLAMP CLAMP CLAMP CLAMP CLAMP 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-OUT IC IC401 LA78040N S813Y V_OUT THERMAL CP803A B2013H02-4P CP803B B2013H02-4P 180V...
  • Page 24 POWER SCHEMATIC DIAGRAM (MAIN PCB) D516 1SS133 TO DEFLECTION/CRT RELAY DRIVE R521 Q504 UNREG+18V KTC3198 RY501 100 2W G5PA-1-SA(WEC) T501 8135091S 15.6 TO SOUND R517 C516 140.5 15.6 W848 SOUND+B CP503 500V 0.001 0.82 003P-2100 140.5 DEGAUSS COIL L503 D505 144.0 8R200026 CP502...
  • Page 25 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/CHROMA/TUNER R906 L901 100uH 0305 AUDIO_MUTE VOLUME R916 R914 C937 2.2K 1/4W 22K 1/4W KANP LCH AUDIO SW IC R913 NJM2534V IC902 C903 BUFFER BAIAS FILTER MODE OUT REGULATOR Adj. VREF -6dB MATRIX PILOT L-R/SAP LEVEL DET DEMOD...
  • Page 26 AV SCHEMATIC DIAGRAM (MAIN PCB) AV (FRONT) J710 MTJ-032-03A-30FE VIDEO_2_IN C701 L2_IN R734 AV (FRONT) J711 MTJ-032-03A-32FE D704 C702 R733 R2_IN MTZJ6.8B AV (FRONT) TO SOUND J712 D702 MTJ-032-03A-31FE FRONT_AUDIO_L R742 MTZJ6.8B FRONT_AUDIO_R REAR_AUDIO_R REAR_AUDIO_L TO MICON/CHROMA/TUNER FRONT_V_IN REAR_V_IN REAR_AV-IN(STEREO) J701 MSP-213V2-432_NI_LF A_IN_R...

  • Page 27: Waveforms

    WAVEFORMS MICON/CHROMA/TUNER 10V 5ms/div 20V 20µs/div 1V 20µs/div DEFLECTION/CRT 10V 5ms/div 3 200mV 20µs/div 14 0.5V 5ms/div 50V 20µs/div 0.5V 5ms/div 15 20V 20µs/div 16 2V 20µs/div 21 50V 20µs/div 5 1V 20µs/div 22 50V 20µs/div 200V 20µs/div 6 1V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 28 WAVEFORMS SOUND 25 0.5V 1ms/div 0.5V 1ms/div 0.5V 1ms/div 26 200mV 1ms/div 200mV 1ms/div 28 200mV 1ms/div 31 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 102B 102A 102B PCB110 (CRT PCB ASS'Y) 101D 101E PCB010 (MAIN PCB ASS'Y) 101D 101E 101F 101C 101F 101B 101A...
  • Page 30 MECHANICAL EXPLODED VIEW (PACKING DIAGRAM) 121, 122, TM101...

  • Page 31: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description 72781162 7A701A416A FRONT CABI ASS'Y 101A 72799329 701WPJD021 CABINET FRONT 101B 72799408 711WPAA121 PLATE FRONT 101C 72799474 713WPAA181 GUIDE REMOCON 101D 72799737 735WPAA786 BUTTON BASE 101E 72799767 735WPBB389 BUTTON FRAME 101F 72794722 800WQ0A070...

  • Page 32: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R402 72796031 R3K181102J R,METAL OXIDE OHM 1W ! R408 72795515 R4X5T6472F R,METAL 4.7K OHM 1/6W ! R424 72794609 R4X5T6333F R,METAL 33K OHM 1/6W ! R426 72795519 R65581010J R,FUSE OHM 1W ! R429...
  • Page 33 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES ! D510 72794475 D2CF2016L0 DIODE,SILICON FE201-6L49 D511 72794469 D97U05R11B DIODE,ZENER MTZJ5.1B T-77 ! D512 72794480 D28T21DQN9 DIODE,SCHOTTKY 21DQ09N-TA2B1 D514 72794491 D1VT001330 DIODE,SILICON 1SS133T-77 D516 72794491 D1VT001330 DIODE,SILICON 1SS133T-77 D517 72794491 D1VT001330...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description SWITCHES SW101 72794688 0504101T34 SWITCH,TACT EVQ21505R SW102 72794688 0504101T34 SWITCH,TACT EVQ21505R SW103 72794688 0504101T34 SWITCH,TACT EVQ21505R SW104 72794688 0504101T34 SWITCH,TACT EVQ21505R SW105 72794688 0504101T34 SWITCH,TACT EVQ21505R VARIABLE RESISTORS VR401 72795471 V1K63H3BTE VOLUME,SEMI FIXED...
  • Page 35 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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