Toshiba 27A51 Service Manual
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Toshiba 27A51 Service Manual

Toshiba 27A51 Service Manual

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FILE NO. 050-200113
SERVICE MANUAL
COLOR TELEVISION
27A51

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Summary of Contents for Toshiba 27A51

  • Page 1 FILE NO. 050-200113 SERVICE MANUAL COLOR TELEVISION 27A51...

  • 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 27 inch / 676mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 2Speaker Position Front Size 2.0 x 3.5 Inch Impedance Sound Output 2.5 + 2.5 W 10%(Typical) 2.0 + 2.0 W NTSC3.58+4.43 /PAL60Hz...
  • Page 4 GENERAL SPECIFICATIONS On Screen Menu Display Menu Type Icon Picture Contrast Brightness Color Tint Sharpness Audio Bass Treble Balance BBE On/Off Stable Sound On/Off Set Up PIP SOURCE TV/CABLE(CATV) CH Program Add/Erase Option Language V-chip CH Label Favorite CH Color Stream DVD/DTV Control Level Volume Brightness...
  • Page 5 GENERAL SPECIFICATIONS G-10 Remote Unit RC-DU Control Glow in Dark 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 Volume Up Volume Down...
  • Page 6 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 Channel Lock Just Clock Function Game Position CH Label VM Circuit Full OSD Premiere Comb Filter 2 Lines...
  • Page 7 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 Stand-by On Timer Terminals Front Video Input Audio Input RCA x 2 Other Terminal Rear...

  • Page 8: Removal Of Anode Cap

    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 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 FLAT PACKAGE IC a 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- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new 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.

  • 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 Set condition is AV MODE without signal. circuits or replacing electrical parts or PCB assemblies. Connect the digital voltmeter to TP002. Adjust the VR502 until the digital voltmeter is 135 ±...
  • Page 13 ELECTRICAL ADJUSTMENTS 2-7: VERTICAL LINEARITY 2-12: SEPARATION 1, 2 Receive the stereo signal (L=2KHz, R=400Hz). NOTE: Adjust after performing adjustments in section 2-6. Connect the AC voltmeter to AUDIO OUT JACK though Receive the center cross signal from the Pattern stereo filter (L=400Hz, R=2KHz).
  • Page 14 ELECTRICAL ADJUSTMENTS 2-15: SUB TINT/SUB COLOR 2-17: PIP VERTICAL POSITION U Receive the color bar pattern. (RF Input) Receive the monoscope pattern. Connect the oscilloscope to TP806. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (20) on the remote control to Activate the adjustment mode display of Fig.
  • Page 15 ELECTRICAL ADJUSTMENTS 2-19: PIP HORIZONTAL POSITION L 2-21: PIP R, G, B LEVEL Receive the monoscope pattern. Set condition is TV MODE without signal. Using the remote control, set the brightness and Connect the oscilloscope to pin 16 of IC751. contrast to normal position.

  • Page 16: Purity And Convergence Adjustments

    ELECTRICAL ADJUSTMENTS 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. minutes before performing the following adjustments.

  • Page 17: Major Components Location Guide

    MAJOR COMPONENTS LOCATION GUIDE VR502 IC751 (Solder side) T501 TP002 VR401 FB401 J702 FOCUS VOLUME SCREEN VOLUME MAIN PCB TP804 J801 TP806 CRT PCB...

  • Page 18: Tv Block Diagram

    TV BLOCK DIAGRAM IC1801 M65664FP SPEAKER SP1001 SCLK CSYNCS SDATA 35 37 39 ANALOG SW IC751 MM1284 52 51 50 11 16 TU001 SOUND AMP IC1001 1 14 AN5276 52 51 50 MICON IC101 OEC7062A OSD BLK PIP VIDEO SW IC750 BA7645N YUV IN IF/CHROMA/AUDIO...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN/VIDEO JACK (INSERTED PARTS) SOLDER SIDE S102Y CP801A CD801 W122 J702 C418 CP101 S101X J701 J703 J704 J203 TP001 S105X D411 W172 R441 W123 R437 TP901 C425_1 C002 W068 CP401_1 FB401 W804 IC701 C735 C713 W072 S103X W152 Q405 W140...
  • Page 20 PRINTED CIRCUIT BOARDS MAIN/VIDEO JACK (CHIP MOUNTED PARTS) SOLDER SIDE C120 R104 R727 Q509 Q704 Q705 R510 IC198 C332 C331 R121 R324 C334 R532 C330 C333 C926 R327 R127 R905 R116 Q101 R904 IC902 Q102 R140 C112 C138 C927 R118 R144 R906 R150...

  • Page 21: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS COMB SOLDER SIDE (INSERTED PARTS) (CHIP MOUNTED PARTS) SOLDER SIDE SOLDER SIDE TP805 R806 C815 Q811 CP1501 W807 D802 R1510 R814 Q1504 R809 R812 R1517 W805 D809 R1516 W002 L1502 L1503 D808 R1509 C1521 C1520 Q1502 Q1503 IC1501 D807 R1513...
  • Page 22 MICON / TUNER SCHEMATIC DIAGRAM (MAIN PCB) OS101 TU001 ENV56D66G3 ACCESORY PIC-28143SY-2 BT001 R03(AB)E_20_T FROM/TO VIDEO SWITCH R003 TM101 330K OSD_R BT002 R03(AB)E_20_T OSD_G OSD_B OSD_BLK C003 H-BUFFER Q102 TP001 FROM/TO CHROMA/IF 2SC2412K RED LED V-BUFFER POWER ON Q101 2SC2412K MICON D109 R139...

  • Page 23: Chroma / If Schematic Diagram

    CHROMA / IF SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO AV C.OUT Y.OUT FROM/TO MICON/TUNER TUNER_VIDEO R214 C613 SYNC_OUT FSC_OUT TUNER_AUDIO_L AUDIO TUNER_AUDIO_R BUFFER C213 Q201 2SC2412K FROM/TO AV C615 R608 CD701B CH243001 D601 C212 H_TONE_H 1/4W 1SS133 R205 TV BUFFER 0.1 B OSD_BLK Q202 TV BUFFER...

  • Page 24: Deflection Schematic Diagram

    DEFLECTION SCHEMATIC DIAGRAM (MAIN PCB) V.OUTPUT IC401 LA78041 THERMAL PROTECTION PUMP UP 25.0 12.0 25.0 R407 3.9K 1/4W C411 R414 500V 27K +-1% R417 33K R408 V801 A68AJB82X10 1/2W SWITCH Q107 S107X S107Y KRC111RTK HS402 FROM/TO DY FROM/TO POWER 763WAA0216 CP401_1 P.CON+5V W827...

  • Page 25: Power Schematic Diagram

    POWER SCHEMATIC DIAGRAM 6.3A 125V CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE 6.3A 125V(F501) (MAIN PCB) ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 6.3A 125V(F501) D516 RELAY DRIVE Q504...
  • Page 26 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO AV R314 AUDIO_R 2.7K R324 C334 AUDIO_L 1.8K 0.033 B C332 R326 C331 0.47 B 0.022 R328 1.8K TONE 136K AMP1 I2C BUS INTERFACE SIMAMP1 VOLAMP1 6.5K 6.5K 6.5K VOLAMP2 CONTROL SIMAMP2 6.5K LOGIC TONE 136K 1.8K...
  • Page 27 AV SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO CHROMA/IF CD701A CH243001 YUV_IN(REAR) J704 AV3-19D-5 FROM/TO COMB FILTER CP1501 6035B-06Z002-T MONITOR V.OUT A/V_OUT(REAR) Y IN J203 C IN AV3-19DS-1 P.CON+5V LINE2(REAR) J703 FROM/TO POWER AV3-19DS-1 L703 P.CON+9V 47uH P.CON+5V 0305 C713 R751 GND_POWER C714 R752 C715...
  • Page 28 VIDEO SWITCH SCHEMATIC DIAGRAM (MAIN PCB) PIP-VIDEO SW. IC750 BA7645N MUTE LOGIC L751 FROM/TO MICON/TUNER 100uH PIP_AV1 PIP_AV2 L750 FROM/TO P-IN-P/TUNER 100uH PIP_SD CP752 (CP051) C756 IMSA-9130B-09 P.CON+9V PIP_AFT R761 BUFFER BUFFER OSD_BLK Q751 Q750 OSD_B 2SA1037AK BUFFER 2SC2412K OSD_G Q755 C751 R755...
  • Page 29 PICTURE IN PICTURE SCHEMATIC DIAGRAM (P-IN-P PCB) L1804 10uH REG.+5V LEVEL SHIFT IC051 KIA7805API IC1803 TC7SET08F R1801 100 1/4W P-In-P IC1801 M65664FP AVSS (SUB) C1821 ADJ_USUB 0.01 B R055 RED BUFFER R1803 27 2W SDATA AVDD Q1803 R1812 100 1/4W (DAC) 2SC2412K R1805...

  • Page 30: Crt Schematic Diagram

    CRT SCHEMATIC DIAGRAM (CRT PCB) FROM DEFLECTION TP804 R828 CP805_1 (CP801A) A2001WV2-10P 2.7K 1/4W RED AMP Q801 123.5 P.CON+9V R813 2SC2621 G.OUT 220 1/4W R.OUT 121.0 B.OUT 582.0 D801 HEATER 117.0 1SS133 RED AMP Q810 119.0 R801 2SC1740SP 100 1/4W R810 180V C813...
  • Page 31 DIGITAL COMB FILTER SCHEMATIC DIAGRAM (COMB PCB) BUFFER C1525 L1506 R1511 Q1504 2SC2412K 22uH C1511 L1503 W803 820uH C1506 FROM/TO 0.01 B CP1501 6035B-06Z002-T MONITOR V.OUT Y IN C IN W807 P.CON+5V BUFFER Q1502 2SA1037AK C1501 W802 BUFFER Q1503 0.1 B BUFFER 2SC2412K Q1501...
  • Page 32 WAVEFORMS MICON/TUNER 2.0V 50ns/div 500mV 10µs/div 500mV 50µs/div 2.0V 50ns/div 200mV 10µs/div 100mV 100ns/div 1.0V 5ms/div 2.0V 50µs/div 1.0V 20µs/div 2.0V 50µs/div 1.0V 20µs/div 1.0V 20µs/div CHROMA/IF 200mV 10µs/div 2.0V 20µs/div 1.0V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 33 WAVEFORMS DEFLECTION 1.0V 5ms/div 200V 20µs/div 500mV 1ms/div SOUND 10V 5ms/div 1.0V 2ms/div 500mV 1ms/div 10V 5ms/div 1.0V 2ms/div 200mV 20µs/div 50V 20µs/div 20mV 1ms/div 200mV 20µs/div 2.0V 20µs/div 20mV 1ms/div 100mV 10µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 34 50V 10µs/div 500mV 10µs/div 1.0V 1ms/div 50V 10µs/div 1.0V 1ms/div 1.0V 10µs/div 50V 10µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 35: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) L503 PCB330 FB401 (COMB PCB) V801 PCB010 (MAIN PCB) PCB250 (P-IN-P PCB) SP1001 PCB170 (VIDEO JACK PCB)

  • Page 36: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AD300867 A3K102E720 CABINET,FRONT ASSY AD300757 771WPA0263 PLATE,JACK AD300758 899EFBA001 WIRING CLIP BZ710260 899HV3T000 HOLDER,ANODE WIRE AD300759 741WUA0021 SPRING,EARTH AD300760 701APJ0082 CABINET,FRONT AD300761 712APB0001 DOOR AD300762 702APA0128 CABINET,BACK AD300763 711WPA0149 PLATE,FRONT AD300764 713WPA0163...

  • Page 37: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description RESISTORS ! R055 AD300041 R3X18A270J R,METAL 27 OHM 2W ! R416 AD300416 R002T25R6J 5.6 OHM 1/2W ! R418 BZ210105 R4X5T6183F R,METAL 18K OHM 1/6W ! R420 BZ210053 R002T22R2J 2.2 OHM 1/2W...
  • Page 38 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description DIODES ! D406 AD300071 D97U01101B DIODE,ZENER MTZJ11B T-77 ! D407 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC D410 BZ410019 D97U03001B DIODE,ZENER MTZJ30B T-77 ! D411 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC ! D501 BZ410085 D2WXN40050...
  • Page 39 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description TRANSISTORS Q107 BZ510068 TNAAJ05003 COMPOUND TRANSISTOR KRC111RTK Q109 BZ510002 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S Q201 BZ510002 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S Q202 BZ510002 T8YJ2412K0 TRANSISTOR,SILICON 2SC2412KT146 R,S Q203 BZ510001 T6YJ1037K0 TRANSISTOR,SILICON 2SA1037AKT146R,S...
  • Page 40 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description COILS &TRANSFORMERS L1804 AD300612 02167F100J COIL L1805 AD300612 02167F100J COIL T401 AD300736 045013002J TRANS,HORIZONTAL DRIVE ZTS7196-3 ! T501 AD300737 048140064S TRANSFORMER,SWITCHING 8140064S JACKS J203 BZ614203 060Q431018 RCA JACK AV3-19DS-1 J701...
  • Page 41 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description MISCELLANEOUS X101 AD300624 1001T8R004 CERAMIC,OSCILLATOR EFOEC8004T4 X601 BZ613004 100CT3R505 CRYSTAL HC-49/C X1801 AD300866 100DT01405 CRYSTAL AT-49 RESISTOR RC....CARBON RESISTOR CAPACITORS CC....CERAMIC CAPACITOR CE....ALUMI ELECTROLYTIC CAPACITOR CP....POLYESTER CAPACITOR CPP....
  • Page 42 TOSHIBA AMERICA CONSUMER PRODUCTS,INC. HEAD OFFICE / 82 TOTOWA ROAD,WAYNE,NEW JERSEY 07470 U.S.A. TOSHIBA HAWAII,INC. HEAD OFFICE / 327 KAMAKEE STREET,HONOLULU,HAWAII 96814 U.S.A.

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