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SERVICE MANUAL

COLOR TELEVISION

FILE NO. 050-200117

20AS21

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Summary of Contents for 20AS21

Page 1: ...SERVICE MANUAL COLOR TELEVISION FILE NO 050 200117 20AS21 ...

Page 2: ... shock while the electric current is flowing 3 USE THE DESIGNATED PARTS The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety Therefore the part which is replaced should be used the part which has the same character Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark the de...

Page 3: ...on at AC 73 W at AC 120 V 60 Hz Stand by at AC 5 W at AC 120 V 60 Hz Per Year kWh Year Protector Power Fuse Yes G 4 Regulation Safety UL Radiation FCC X Radiation DHHS G 5 Temperature Operation 5oC 40oC Storage 20oC 60oC G 6 Operating Humidity Less then 80 RH G 7 On Screen Menu Yes Display Menu Type Character Picture Yes Contrast Yes Brightness Yes Color Yes Tint Yes Sharpness Yes Audio No Bass No...

Page 4: ...0 BF h Power Source Voltage D C 3V UM size x pcs UM 4 x 2 pcs Total Keys 27 Keys Keys Power Yes 1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes 100 No CH Up Yes CH Down Yes Volume Up Yes Volume Down Yes TV Caption Text Yes CH1 CH2 Yes TV Video TV AV Yes CH RTN CH ENT Quick View Yes Sleep Yes RE Call Call Yes Reset Yes Menu Yes Enter Yes Mute Yes Exit No MTS Audio Select No Set Yes Set ...

Page 5: ...Stable Sound No FBT Leak Test Protect Yes Favorite CH No G 12 Accessories Owner s Manual Language English Spanish W Warranty Yes Remote Control Unit Yes Rod Antenna No Poles Terminal Loop Antenna No Terminal U V Mixer No DC Car Cord Center No Guarantee Card No Warning Sheet No Circuit Diagram No Antenna Change Plug No Service Facility List No Important Safety Instruction Yes Dew AHC Caution Sheet ...

Page 6: ...o Video Output No Audio Output No Euro Scart No Color Stream No Diversity No Ext Speaker No DC Jack 12V Center No VHF UHF Antenna Input F Type AC Outlet No G 14 Set Size Approx W x D x H mm 488 x 465 x 416 G 15 Weight Net Approx 17 5kg 38 6 lbs Gross Approx 20 0kg 44 1lbs G 16 Carton Master Carton No Content Sets Material Dimensions W x D x H mm x x Description of Origin No Gift Box Yes Material D...

Page 7: ... 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 2 DISASSEMBLY INSTRUCTIONS GND on the CRT Screwdriver Alligator Clip Support CRT GND on the CRT Rubber Cap CRT Support Fig 1 1 Fig 1 2 3 After one side is removed pull in the opposite direction to remove the other NOTE Take care not to damage the Rubber Cap INSTALLATION 1 Clean th...

Page 8: ...ng a blower type IC desoldering machine Refer to Fig 2 2 2 Fig 2 2 NOTE Do not add the rotating and the back and forth directions force on the IC until IC can move back and forth easily after desoldering the IC leads completely When IC starts moving back and forth easily after desoldering completely pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering ma...

Page 9: ... Thin tip Soldering Iron NOTE When the IC leads are bent during soldering and or repairing do not repair the bending of leads If the bending of leads are repaired the pattern may be damaged So be always sure to replace the IC in this case Finally confirm the soldering status on four sides of the IC using a magnifying glass Confirm that no abnormality is found on the soldering position and installa...

Page 10: ...0010 CRTON ADDRESS DATA FIG 1 Initial setting content of MEMORY IC POWER ON total hours 16 x 16 x 16 x thousands digit value 16 x 16 x hundreds digit value 16 x tens digit value ones digit value NOTE FOR THE REPLACING OF MEMORY IC If a service repair is undertaken where it has been required to change the MEMORY IC the following steps should be taken to ensure correct data settings while making ref...

Page 11: ... digital voltmeter is 2 9 0 1V 1 2 3 4 5 BEFORE MAKING ELECTRICAL ADJUSTMENTS 2 2 CUT OFF 1 2 3 4 Adjust the unit to the following settings R DRIVE 10 B DRIVE 10 R BIAS 64 G BIAS 64 B BIAS 64 BRIGHTNESS 130 CONTRAST 100 Place the set with Aging Test for more than 15 minutes Activate the adjustment mode display of Fig 1 1 and press the channel button 01 on the remote control to select CUT OFF Adjus...

Page 12: ...te the adjustment mode display of Fig 1 1 and press the channel button 05 on the remote control to select H PHASE Press the VOL UP DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum 2 7 VERTICAL SIZE NOTE Adjust after performing adjustments in section 2 6 1 2 3 4 Receive the crosshatch signal from the Pattern Generator Activate the adjustm...

Page 13: ...the color bar generator from the green raster pattern to the crosshatch pattern Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets Combine red blue magenta and green by adjusting the pair of 6 pole magnets Adjust the crosshatch pattern to change to white by repeating steps 6 and 7 Turn the unit on and let it warm up for at lea...

Page 14: ...MAJOR COMPONENTS LOCATION GUIDE MAIN PCB FOCUS VOLUME SCREEN VOLUME FB401 CP601 TU001 CRT PCB J801 TP023 TP022 R606 ...

Page 15: ...4C02BDP 1A 2 5 10 17 UNREG 12V 7 3 8 7V REG OUT R OUT G OUT B OUT START UP VCC H OUT X TAL RF AGC OUT VIF IN 1 VIF IN 2 V PULSE OUT SCL SDA MCU RESET V OUT AD6 KEY2 26 3 SDA SCL 12 INV FBP OUT 1 P50 H SYNC 27 39 OUT1 BLANK BL FAST BLK 20 B IN 40 BLUE B 28 41 GREEN G G IN 30 R IN 42 RED R 17 CVIN 40 Y SW OUT VCC 41 5 7V REG OUT 55 VREG VCC 6 FBP IN Q603 REG DY 39 5V REG Q604 Q605 REG D501 D504 RECT...

Page 16: ...8 W061 W062 T502 R417 Q606 D001 R426 C448 C406_1 R504 D505 C517 D513 W072 W816 R508 TP401 D514 C624 IC401 C P4 01 Q507 W078 R641 R500_1 W005 R623 W079 FB401 D510 W010 W081 C125 W057 C137 C129 D512 W826 W827 W076 W070 CD351 R507 Q501 R409 C609 C506 D522 D521 D520 D504 D515 TH501 D408 R427 Q503 C530 R525 R523 R645 W097 R404_1 W099 R5 17 C002 W046 W044 W001 R115 R612 R703 W050 D519 J703 J702 W100 R60...

Page 17: ...1 R634 R615 R622 R635 R633 R114 R625 R103 C626 R602 R128 R101 R126 R406 R419 R420 R354 R359 R111 R702 R353 R628 R512 R519 R513 R632 R357 R620 C120 R130 R127 R105 R007 C353 R506 R509 R131 C655 C629 R360 R627 R626 C140 R604 R112 R113 R132 R639 R816 R815 R813 C807 R814 C806 R809 C804 R811 C805 R601 C650 PRINTED CIRCUIT BOARDS MAIN CRT CHIP MOUNTED PARTS SOLDER SIDE 17 33 49 1 ...

Page 18: ...L UP SW104 SKHVBED010 VOL DOWN SW105 SKHVBED010 POWER TU001 ENV56D66G3 1 10 11 12 13 14 15 2 3 4 5 6 7 8 9 C118 470 6 3V YK C128_1 100 6 3V YK IC199 S 24C02BDP 1A MEMORY IC 1 2 3 4 5 6 7 8 GND B Vout OS101 PIC 28143SY 2 1 2 3 IC101 OEC7063A MICON IC 1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 24 25 26 27 28 29 3 30 31 32 33 34 35 36 37 38 39 4 40 41 42 5 6 7 8 9 X101_1 EFOEC8004T4 1 2 3 DEFLECTI...

Page 19: ... SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME DANS LA NOMENCLATURE DES PIECES N UTILISER QUE CELLS DECRITES DANGEREUSES AN POINT DE VUE SECURITE ETANT LES PIECES REPAREES PAR UN ATTENTION DESCRIBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE SINCE THESE PARTS MARKED BY CAUTION D610 MTZJ12B D602 MTZJ8 2B D611 MTZJ12B D612 MTZJ12B W816 W810 W818 W817...

Page 20: ...S MEASURED WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL NOTE C516 470P 500V B C517 470P 2KV YR C503 0 001 500V B C502 0 001 500V B C514_1 680P 2KV YR C501 0 0082 M C505_1 0 1 275V PHE840 C506 0 0047 250V KH C509 0 047 M C526_2 330 200V UP C530 10 100V MHE C521_2 100 160V YXF C511_1 22 50V KA R507 470 1 4W R508 2 7K 1 4W R511 1 2M 1 4W R510 1...

Page 21: ... 0 1 100V MHE C446_1 22 50V YK R814 330 R811 330 R809 330 R426 2 7K 1 4W R404_1 68 1 4W R403 10K 1 4W R416 1 1 2W R815 4 7K R813 4 7K R414 100 1 4W R420 4 7K R802_1 2 7K 1 4W R804 2 7K 1 4W R806_1 2 7K 1 4W R410 330 1 2W R415 1 8K 1 2W R816 4 7K R413 2 2K 1 2W R446 4 7K 1 2W R427 100 1 4W R407 1 8 1 2W R406 2 2K R645 33 1 2W R419 470 R423 6 8K R445 150K 1 4W R421 220K 1 4W OF PRINTING AND SUBJECT ...

Page 22: ...O CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME DANS LA NOMENCLATURE DES PIECES N UTILISER QUE CELLS DECRITES DANGEREUSES AN POINT DE VUE SECURITE ETANT LES PIECES REPAREES PAR UN ATTENTION DESCRIBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE SINCE THESE PARTS MARKED BY CAUTION W807 W803 C351 1 50V KA C354 470 10V YK IC351 AN7511 SOUND AMP IC 1 2 3 4 5 6 7 8 ...

Page 23: ...div 500mV 20µs div 7 9 200mV 20µs div CHROMA 0 5V 5ms div 10 11 1V 20µs div 12 1V 20µs div 1V 20µs div 13 8 20V 20µs div 3 200mV 20µs div DEFLECTION CRT 14 0 5V 5ms div 15 20V 20µs div NOTE The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram ...

Page 24: ... 20µs div SOUND AV 0 5V 1ms div 23 10V 5ms div 18 10V 5ms div 19 1V 1ms div 24 50V 20µs div 20 NOTE The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram 25 500mV 1ms div WAVEFORMS 26 500mV 20us div ...

Page 25: ...MECHANICAL EXPLODED VIEW 203 FB401 PCB010 MAIN PCB TU001 201 203 111 108 109 110 202 202 202 202 113 113 104 101 105 106 103 107 112 SP351 114 114 114 L503 V801 102 114 J801 PCB110 CRT PCB ...

Page 26: ... AD300842 702WPAA176 CABINET BACK 110 AD300893 722549A034 SHEET RATING 111 AD300843 800WQ00044 FELT SHEET 112 AD300007 7230006755 SHEET CAUTION 113 AD300844 800WQ00038 FELT SHEET 114 BZ710321 8121F50B84 SCREW TAPPING B0 GW20 FLAT 5x28 201 BZ710019 8109630802 SCREW TAP TITE B BRAZIER 3x8 202 BZ710035 8117540A64 SCREW TAPPING B0 TRUSS 4x16 203 BZ710239 8109I30A04 SCREW TAP TITE B WH7 3x10 AD300700 7...

Page 27: ...0J0B0513K CC 0 001 UF 500V B C505 BZ110145 P2472B104M CMP 0 1 UF 275V PHE840 C506 AD300665 CB3LE0MQ3M CC 0 0047UF 250V C511 AD300666 E50HU5220M CE 22 UF 50 V C514 BZ110122 C0JLYR7U2K CC 680 PF 2KV YR C515 AD300925 E02LT2102M CE 1000 UF 16V C517 BZ110125 C0JLYR7Q2K CC 470 PF 2KV YR C519 BZ110081 E02LT2471M CE 470 UF 16V C521 AD300060 E62NFB101M CE 100 UF 160V C526 AD300607 E51CGC331M CE 330 UF 200V...

Page 28: ...10009 TC3F042170 TRANSISTOR SILICON 2SC4217 D E RAC Q803 BZ510009 TC3F042170 TRANSISTOR SILICON 2SC4217 D E RAC COILS TRANSFORMERS L101 AD300676 021LA63R3K COIL 3 3 UH L501 AD300677 029T00A7M1 COIL LINE FILTER 1R5A102F20 L503 BZ310092 028R200029 COIL DEGAUSS 8R200029 L601 AD300678 0216731R2K COIL 1 2 UH L606 BZ310009 021LA62R2K COIL 2 2 UH L607 BZ310043 021LA6150K COIL 15 UH L801 BZ310041 02167F10...

Page 29: ...0 DEGAUSS ELEMENT ZPB45BL3R0A TM101 AD300690 076N0EH010 TRANSMITTER RC EH010 TU001 AD300691 0145S00052 TUNER VHF UHF ENV56D66G3 V801 AD300890 098Q200489 CRT W DY A48AGY13X77J X101 AD300624 1001T8R004 CERAMIC OSCILLATOR EFOEC8004T4 X602 BZ613004 100CT3R505 CRYSTAL HC 49 C RESISTOR RC CARBON RESISTOR CAPACITORS CC CERAMIC CAPACITOR CE ALUMI ELECTROLYTIC CAPACITOR CP POLYESTER CAPACITOR CPP POLYPROPY...

Page 30: ...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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