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Toshiba 20A42 Service Manual
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Toshiba 20A42 Service Manual

Toshiba 20A42 Service Manual

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FILE NO. 050-200209
SERVICE MANUAL
COLOR TELEVISION
20A42
DOCUMENT CREATED IN JAPAN, Jun., 2002

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  • Page 1 FILE NO. 050-200209 SERVICE MANUAL COLOR TELEVISION 20A42 DOCUMENT CREATED IN JAPAN, Jun., 2002...

  • 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 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 4 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 CH Set Up TV/CABLE(CATV) Auto CH Memory Add/ Delete Lock Language V-chip CH Label Favorite CH Color Stream DVD/DTV Control Level Volume...
  • Page 5 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 6 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 7 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 Stand-by On Timer Terminals Front Video Input...

  • Page 8: Removal Of Anode Cap

    DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to 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 9: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after 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 10 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 11: 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 12: Before Making Electrical Adjustments

    ELECTRICAL ADJUSTMENTS BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: CONSTANT VOLTAGE Read and perform these adjustments when repairing the Place the set with Aging Test for more than 15 minutes. circuits or replacing electrical parts or PCB assemblies. Set condition is AV MODE without signal. Using the remote control, set the brightness and contrast CAUTION to normal position.
  • Page 13 ELECTRICAL ADJUSTMENTS 2-6: VIF VCO 2-11: OSD HORIZONTAL Place the set with Aging Test for more than 15 minutes. Activate the adjustment mode display of Fig. 1-1. Receive the monoscope pattern. Press the VOL. UP/DOWN button on the remote Connect the digital voltmeter between the pin 5 of control until the difference of A and B becomes CP601 and the GND.
  • Page 14 ELECTRICAL ADJUSTMENTS Method (2) Set the multi-sound signal generator L-ch=1KHz, R-ch =Non input and receive the RF. Connect the oscilloscope to the pin 7 of CP601. Activate the adjustment mode display of Fig. 1-1 and press the channel button (26) on the remote control to select “SEP 1”.

  • Page 15: Purity And Convergence Adjustments

    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 16: Electrical Adjustment Parts Location Guide (Wiring Connection)

    ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP024 CP806 TP022 J801 CP801 CP802B CP803B W055 J701 CP803A CP601 IC901 FB401 VR401 TP402 TU001 VR402 CP401 VR502 CP802A T501 CP1001 CP502 AC IN S501B S501A SPEAKER J1001 J710 J711...

  • Page 17: Block Diagram

    BLOCK DIAGRAM SOUND DECORDER IC TONE CONTROL IC COMB FILTER IC IC901 AN5829S IC302 M62420SP IC1501 TC90A45F J1001 22 21 24 18 19 9 10 2 19 P.CON + 9V Q1001 MUTE SW CHROMA IC TU001 IC601 M61250FP IC1001 AN7522 SDA SCL 51 AUDIO OUT SP1001...
  • Page 18 P R INT E D C IR C UIT B OA R DS MA IN/C R T (INS E R T E D P A R T S ) S OL DE R S IDE S W105 S W102 S W101 S W104 S W103 D105...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE C912 C724 C914 C917 R142 IC901 R004 R141 C918 C916 R307 R308 C316 R306 R513 C322 R532 Q901 C513 Q902 C321 Q507 R534 R437 R507 C519_1 R508 C1001 C512 R505 R506 R1015 R643 R611...
  • Page 20 MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) TU001 ENV56DB6G3 ACCESSORY BT001 R03(AB)E_20_T C003 R002 R101 R126 TM101 BT002 2.7K RC-EH030 RED LED R03(AB)E_20_T R128 R004 POWER ON D105 390K R135 SLR-342VCT32 OS101 RPM7138-H5 W810 FROM/TO POWER R001 AT+40V 1/2W POWER_FAIL R110 1K 1/4W R140 R107 10 1/4W...

  • Page 21: Chroma Schematic Diagram

    CHROMA SCHEMATIC DIAGRAM (MAIN PCB) FROM POWER UNREG+12V R629 Q603 KTC3203_Y Q604 Q605 KTC3203_Y KTC3203_Y C652 Q606 TO AV KTC3203_Y Q608 KTC3203_Y TU_VIDEO 11.3 R643 FROM/TO COMB/FILTER C647 Y_IN CF603 C_IN SFSRA4M50CF00-A0 R646 STEREO+5V C638 1.59 8.66 0.51 8.03 3.17 8.76 2.59 1.96...
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) (CRT PCB) FROM/TO CHROMA CP802B B2013H02-5P CP802A B2013H02-5P 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 AN5522 CP803A B2013H02-4P CP803B B2013H02-4P V_FEEDBACK HEATER HEATER...

  • Page 23: Power Schematic Diagram

    POWER SCHEMATIC DIAGRAM (MAIN PCB) TO CHROMA UNREG+12V RELAY DRIVE Q504 D516 KTC3198 T501 1SS133 8135080S S802Y 131.7 143.1 41.8 C515 TO DEFLECTION/CRT 20.9 500V 0.001 143.1 D518 W861 RY501 H_DV_+B 9.19 ALKS321 173.7 AU02A-EIC DEGAUSS COIL C516 112.6 L503 8R200026 500V 0.001...
  • Page 24 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO MICON/TUNER AUDIO_MUTE R309 C303 1.8K 0.033 B C315 C316 0.022 0.47 BUFFER Q901 2SA1037AK 1.8K TONE 136K AMP1 I2C BUS INTERFACE BUFFER SIMAMP1 Q902 VOLAMP1 6.5K 6.5K 6.5K 2SA1037AK VOLAMP2 CONTROL SIMAMP2 6.5K LOGIC TONE IIC Decoder St.PLL...
  • Page 25 AV SCHEMATIC DIAGRAM (MAIN PCB) VIDEO_3_IN VIDEO IN(FRONT) J710 HTJ-032-03AY C702 R733 C701 R734 AUDIO_L IN(FRONT) L3_IN J711 HTJ-032-03AW AUDIO_R IN(FRONT) R3_IN J712 HTJ-032-03AR FROM/TO SOUND W839 FRONT_AUDIO_L S804X W847 FRONT_AUDIO_R REAR_AUDIO_R REAR_AUDIO_L FROM DEFLECTION/CRT VIDEO AMP IC IC702 NJM2234L P.CON+9V FROM/TO POWER Vin1...
  • Page 26 COMB/FILTER SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO CHROMA STEREO+5V C_IN Y_IN FROM/TO AV C1523 C1514 P.CON+9V 0.01 R1513 BUFFER Q1503 KTC3198 VIDEO_IN BUFFER Q1502 C1511 KTC3198 R1508 R1514 W895 0.01 B C1512 R1507 R1501 BUFFER D.VCC D.VSS W850 Q1501 2SA1015Y C1515 R1511 R1503 KILLER...
  • Page 27 WAVEFORMS MICON/TUNER 1 1V 0.1µs/div 200mV 20µs/div 12 1V 20µs/div 20V 20µs/div 1V 20µs/div 0.5V 20µs/div DEFLECTION/CRT 3 200mV 20µs/div 9 200mV 20µs/div 14 0.5V 5ms/div 200mV 5ms/div 0.5V 5ms/div 15 20V 20µs/div CHROMA 16 2V 20µs/div 11 1V 20µs/div 6 0.5V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 28 WAVEFORMS 29 200mV 1ms/div 200V 20µs/div 22 50V 20µs/div SOUND 10V 5ms/div 25 0.5V 1ms/div 30 200mV 1ms/div 10V 5ms/div 26 200mV 1ms/div 31 200mV 1ms/div 0.5V 1ms/div 50V 20µs/div 200mV 1ms/div 0.5V 1ms/div 21 50V 20µs/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 View

    MECHANICAL EXPLODED VIEW PCB110 (CRT PCB) PCB010 (MAIN PCB)

  • Page 30: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AD301453 A3L701X720 CABINET,FRONT ASSY BZ710039 8995034000 CORD CLIP UL CO. AD301454 701WPJB692 CABINET,FRONT AD301455 711WPA0170 PLATE,FRONT AD301456 713WPA0204 GUIDE,REMOCON AD301457 735WPA0652 BUTTON,BASE AD301458 735WPBA419 BUTTON,FRAME AD301488 702WPA0880 CABINET,BACK AD301460 722549A080 SHEET,RATING AD300007...

  • Page 31: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS R144 AD301201 R00106103J 10K OHM 1/6W AD301479 R001T6103J 10K OHM 1/6W R402 AD300043 R3X181102J R,METAL OXIDE OHM 1W ! R408 AD301014 R4X5T6472F R,METAL 4.7K OHM 1/6W ! R409 AD300037 R4X5T6153F R,METAL...
  • Page 32 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description DIODES ! D407 AD300731 D2WXN49370 DIODE,SILICON 1N4937 ! D408 AD300731 D2WXN49370 DIODE,SILICON 1N4937 ! D410 AD300731 D2WXN49370 DIODE,SILICON 1N4937 ! D411 AD300731 D2WXN49370 DIODE,SILICON 1N4937 D412 BZ410043 D2WT011E10 DIODE,SILICON 11E1-EIC D418 BZ410019...
  • Page 33 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description TRANSISTORS ! Q806 BZ510091 TCA0042170 TRANSISTOR,SILICON KTC4217(O,Y) Q901 BZ510001 T6YJ1037K0 TRANSISTOR,SILICON 2SA1037AKT146R,S Q902 BZ510001 T6YJ1037K0 TRANSISTOR,SILICON 2SA1037AKT146R,S Q1001 BZ510002 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S Q1501 BZ510034 TA5T010154 TRANSISTOR,SILICON 2SA1015Y(TPE2) Q1502 BZ510069 TCATC31980 TRANSISTOR,SILICON...
  • Page 34 ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description MISCELLANEOUS ! SP1002 AD301050 070C457003 SPEAKER SG05K07BRA ! TH501 BZ410079 DF5EL3R0A0 DEGAUSS ELEMENT ZPB45BL3R0A TM101 AD301451 076N0EH030 TRANSMITTER RC-EH030 ! TU001 AD301052 0145100059 TUNER,VHF-UHF ENV56DB6G3 V801 AD301452 098Y210435 CRT W/DY A51LMV10X20N45 X602 BZ613004...
  • Page 35 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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