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Toshiba 20A44 Service Manual
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Toshiba 20A44 Service Manual

Toshiba 20A44 Service Manual

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FILE NO. 050-200412
SERVICE MANUAL
COLOR TELEVISION
20A44
DOCUMENT CREATED IN JAPAN, Mar., 2004

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  • Page 1 FILE NO. 050-200412 SERVICE MANUAL COLOR TELEVISION 20A44 DOCUMENT CREATED IN JAPAN, Mar., 2004...

  • 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: Table Of Contents

    TABLE OF CONTENTS SERVICING NOTICES ON CHECKING ..................A1-1 A1-1 HOW TO ORDER PARTS ......................IMPORTANT ..........................A1-1 TABLE OF CONTENTS ......................A2-1 A3-1~A3-5 GENERAL SPECIFICATIONS ....................DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP ....................B1-1 2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ..........B2-1, B2-2 SERVICE MODE LIST ........................

  • Page 4: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 20 inch / 508.0mmV System CRT Type Normal Deflection degree 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) 2.0+2.0 W NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System...
  • Page 5 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 6 GENERAL SPECIFICATIONS G-10 Remote Unit RC-EH Control Glow in Dark 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 Volume Up Volume Down...
  • Page 7 GENERAL SPECIFICATIONS G-11 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type USA,ORION 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 8 GENERAL SPECIFICATIONS G-13 Interface Switch Front Power System Select Main Power SW Sub Power Channel Up/Reset Channel Down/Enter Volume Up/Set Up Volume Down/Set Down MENU=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...

  • Page 9: 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 10: 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 11 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 12: 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 and LOCK PASSWORD.

  • Page 13: 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. Set condition is AV MODE without signal. CAUTION Connect the digital voltmeter to the TP402. •...
  • Page 14 ELECTRICAL ADJUSTMENTS 2-6: VERTICAL SHIFT 2-10: BRIGHT CENT Receive the monoscope pattern. Receive the monoscope pattern. (RF Input) Using the remote control, set the brightness and contrast Using the remote control, set the brightness and contrast to normal position. to normal position. Check if the step No.
  • Page 15 ELECTRICAL ADJUSTMENTS "A" "A" Fig. 2-2 Red 110% White 100% Fig. 2-3 2-13: LEVEL Receive the VHF HIGH (70dB). Connect the AC voltmeter to pin 6 of CP601. Activate the adjustment mode display of Fig. 1-1 and press the channel button (25) on the remote control to select "LEVEL".
  • Page 16 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 17 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP024 CP806 TP022 J801 CP801 CP802B CP803B J701 CP803A CP601 VR401 FB401 VR402 CRT DY TP402 TU001 CP401 CP1001 VR502 SPEAKER CP502 L503 DEGAUSS COIL CP802A AC IN S501A S501B J1001...

  • Page 18: Block Diagrams

    BLOCK DIAGRAM COMB FILTER IC IC1501 TC9045F CH. DOWN VOL. DOWN MICON/CHROM IC IC101 OEC7091B CH. UP RGB Proc.2 VOL. UP Q804 OSD SW CONTRAST BRIGHTNESS RED AMP RGB OUTPUT Stage POWER Chroma DRIVE Q805 Proc. CUT OFF ACC/C-BPF OS101 GREEN AMP HV BLK RGB Proc.1...

  • Page 19: Printed Circuit Boards Main/Crt

    PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE SW101 SW104 SW103 J710 J711 J712 SW105 SW102 J1001 D106 OS101 W012 6.3A125VOR250V R1013 S802X Q1502 C702 W818 R1012 TP024 W876 W103 W865 CP806_1 W898 FH501 F501 FH502 C505 Q1501 Q1505 J801 S501B Q608 W044...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE C724 IC901 R004 R003 IC302 C309 R006 R437 C307 R314 R507 C519 R1003 C512 R505 R1008 R121_1 C603 C609 R814 C809 W879 R604 R627 R617 R609 C1519 R610 C1518 C629 IC1501 R1503 R1501 C1502...
  • Page 21 MICON/CHROMA/TUNER SCHEMATIC DIAGRAM (MAIN PCB) W858 ACCESSORY Q609 R621 KTC3198 H.CTL BT001 Q607 FROM COMBI/FILTER R03(AB)E_2P_G KTC3198 R618 Y_IN BT002 TM101 8.2K 1/4W R03(AB)E_2P_G RC-EH030 FROM/TO DEFLECTION/CRT R608 C118 CLAMP C630_1 1K 1/4W CLAMP_OFF C101_1 6.3V R110 V_OUT C632 R109 P.CON+8V[A] V_FEEDBACK AT+5V...
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/CHROMA/TUNER CP802A B2013H02-6P CP802B B2013H02-6P CLAMP CLAMP CLAMP CLAMP CLAMP CLAMP_OFF CLAMP_OFF CLAMP_OFF CLAMP_OFF CLAMP_OFF 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_FEEDBACK V-OUT IC IC401 LA78040N-E CP803A B2013H02-4P CP803B B2013H02-4P...
  • Page 23 TV POWER SCHEMATIC DIAGRAM (MAIN PCB) TO MICOM/CHROMA/MICON W836 REMOTE+12V UNREG+12V W812 RELAY DRIVE Q504 D516 KTC3198 1SS133 TO DEFLECTION/CRT S802Y UNREG+12V RY501 ALKS321 B503 C516 W848 DEGAUSS COIL L503 W5RH3.5X5X1.0 500V 0.001 TO SOUND 8R200026 CP502 A1561WV2-2P SOUND+B TH501 D505 30DF6-FC B59203-S1060-B14...
  • Page 24 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/CHROMA/TUNER R308 AUDIO_MUTE P.CON+8V[B] C309 R311 0.039 L IN L ONT Tone Volume 2.2K SURR Balance Control Control /MUTE MODE control R IN Vref R OUT IIC Decoder St.PLL OUT SW Pilot Input Switch L-R Filter L-R Demod Cancel...
  • Page 25 COMB/FILTER SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/CHROMA/TUNER STEREO+5V C_IN Y_IN P.CON+8V[B] C1523 C1514 0.01 TO AV VIDEO R1508 BUFFER Q1502 C1511 KTC3198 0.01 F C1512 C1502 47P CH R1501 BUFFER D.VCC D.VSS Q1501 KTA1266 C1515 R1503 KILLER CKin 100P CH W824 2.7K TEST...
  • Page 26 AV SCHEMATIC DIAGRAM (MAIN PCB) VIDEO_3_IN VIDEO IN(FRONT) J710 HTJ-032-03AY C701 R734 L3_IN AUDIO_L IN(FRONT) J711 HTJ-032-03AW AUDIO_R IN(FRONT) C702 R733 J712 R3_IN HTJ-032-03AR D704 TO SOUND MTZJ6.8B FRONT_AUDIO_L FRONT_AUDIO_R S802X REAR_AUDIO_R REAR_AUDIO_L FROM/TO TV POWER VIDEO AMP IC IC702 NJM2234L FROM MICON/CHROMA/TUNER P.CON+8V[A]...

  • Page 27: Micon/Chroma/Tuner

    WAVEFORMS MICON/CHROMA/TUNER 200V 20µs/div 1V 20µs/div 20V 20µs/div 3 200mV 20µs/div 10V 5ms/div 200mV 20µs/div DEFLECTION/CRT 14 0.5V 5ms/div 10V 5ms/div 0.5V 5ms/div 5 1V 20µs/div 15 20V 20µs/div 50V 20µs/div 16 2V 20µs/div 6 1V 20µs/div 21 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 28 WAVEFORMS 31 200mV 1ms/div 22 50V 20µs/div 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 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 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) 118, 119, 120, TM101...

  • Page 31: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AE003439 7A701A090A FRONT CABI ASS'Y 101A AE003440 701WPJC593 CABINET,FRONT 101B AD301455 711WPA0170 PLATE,FRONT 101C AD301456 713WPA0204 GUIDE,REMOCON 101D AD301457 735WPA0652 BUTTON,BASE 101E AE003441 735WPBB037 BUTTON,FRAME 101F AE003069 800WQ0A070 FELT SHEET AE003442 7A702A020A BACK CABI ASS'Y...

  • Page 32: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS ! R401 AD300783 R3X181221J R,METAL OXIDE 220 OHM 1W ! R402 AE000676 R3K181102J R,METAL 1K OHM 1W ! R408 AD301014 R4X5T6472F R,METAL 4.7K OHM 1/6W ! R409 AD300037 R4X5T6153F R,METAL 15K OHM 1/6W...
  • Page 33 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES D517 AD300731 D2WXN49370 DIODE,SILICON 1N4937 D520 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D521 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D523 AD300731 D2WXN49370 DIODE,SILICON 1N4937 D524 BZ410064 D97U03R91B DIODE,ZENER MTZJ3.9B T-77 D526 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description SWITCHES SW101 BZ612010 0504101T34 SWITCH,TACT EVQ21505R SW102 BZ612010 0504101T34 SWITCH,TACT EVQ21505R SW103 BZ612010 0504101T34 SWITCH,TACT EVQ21505R SW104 BZ612010 0504101T34 SWITCH,TACT EVQ21505R SW105 BZ612010 0504101T34 SWITCH,TACT EVQ21505R VARIABLE RESISTORS VR401 BZ210238 V1K6313BTE VOLUME,SEMI FIXED...
  • Page 35 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...
  • Page 36 COLOR TELEVISION 20A44 -SUMMARY- This Supplement serves as an update to the original 20A44 Service Manual, file number 050-200412. Please refer to this Supplement in conjunction with the original Service Manual when servicing this model. DOCUMENT CREATED IN JAPAN, Jan., 2005...
  • Page 37 TOSHIBA CORPORATION DIGITAL MEDIA NETWORK COMPANY VISUAL MEDIA NETWORK DIV. INTERNATIONAL CUSTOMER SERVICE & SUPPORT DEPT [11F-B] TOSHIBA BLDG. 1-1, SHIBAURA 1-CHOME, MINATOKU, TOKYO 105-8001, JAPAN FACSIMILE: (03)5444-9439 PONE: (03)3457-3536 SERVICE INSTRUCTION FILE NO. 053-200412A DATE:Aug.,2004 RANK: Product: COLOR TELEVISION...
  • Page 38 ELECTRICAL REPLACEMENT PARTS LIST MFR'S VERSION G MFR'S VERSION H REF. NO. PART NO. DESCRIPTION TSB P/N PART NO. DESCRIPTION TSB P/N CAUSE IC199 A3M912Y015 INIT DATA AE003435 A3M913Y015 INIT DATA AE005392 Delete the V-Chip. A3M912Y010 MAIN PCB ASS'Y (VERSION G) AE003436 A3M913Y010 MAIN PCB ASS'Y (VERSION H) PCB010 AE005393...
  • Page 39 ORION ELECTRIC CO.,LTD. 41-1 IEHISA-CHO,TAKEFU-CITY,FUKUI 915-8555 JAPAN FACSIMILE: (0778)24-5456 PHONE: (0778)23-0001 SERVICE INSTRUCTION FILE NO. 053-200412B DATE:Jan.,2005 RANK: Product: COLOR TELEVISION Model: 20A44 Corrective reason: Performance improvement of IC. Corrective action: Parts exchange. Applicable units: 7905A2492 or younger. ORION ELECTRIC CO.,LTD.
  • Page 40 ELECTRICAL REPLACEMENT PARTS LIST MFR'S VERSION H MFR'S VERSION J REF. NO. PART NO. DESCRIPTION TSB P/N PART NO. DESCRIPTION TSB P/N CAUSE IC101 I56F07091B OEC7091B AE002802 I56F07091C OEC7091C AE005644 MICON VERSION UP MAIN PCB ASS'Y (VERSION H) MAIN PCB ASS'Y (VERSION J) PCB010 A3M913Y010 AE005393 A3M9139010...
  • Page 41 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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