Toshiba 20AS25 Service Manual Download | Manualshive

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TOSHIBA CORPORATION

1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN

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Summary of Contents for 20AS25

Page 1: ...SERVICE MANUAL COLOR TELEVISION 20AS25 FILE NO 050 200501 ...

Page 2: ...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 designated parts must be used 4 PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING There are parts which use the insulation material such as a tube or tape for safety or which are assembled in the condition that these do not...

Page 3: ...ure soldering iron please be carefull not to heat too long Pb free solder will tend to splash when heated too high about 1100 F 600 C All products with the printed circuit board with PbF printing must be serviced with lead free solder When soldering or unsoldering completely remove all of the solder from the pins or solder area and be sure to heat the soldering points with the lead free solder unt...

Page 4: ...NFIRMATION OF HOURS USED WHEN REPLACING EEPROM MEMORY IC ELECTRICAL ADJUSTMENTS BLOCK DIAGRAM PRINTED CIRCUIT BOARDS MAIN CRT SCHEMATIC DIAGRAMS MICON CHROMA TUNER TV POWER DEFLECTION CRT SOUND AV WAVEFORMS MECHANICAL EXPLODED VIEW MECHANICAL REPLACEMENT PARTS LIST ELECTRICAL REPLACEMENT PARTS LIST A1 1 A1 1 A1 1 A1 2 A2 1 A3 1 A3 5 B1 1 B2 1 B2 2 C 1 C 1 C 1 D 1 D 4 E 1 E 2 F 1 F 4 G 1 G 2 G 3 G ...

Page 5: ... Destination USA W CATV Tuning System F Synth Input Impedance VHF UHF 75 ohm 2 69 4A A 5 A 1 CH Coverage A I J W W 1 W 84 Intermediate Picture FP 45 75MHz Frequency Sound FS 41 25MHz FP FS 4 50MHz Preset CH No Stereo Dual TV Sound No Tuner Sound Muting Yes G 3 Power Power Source AC 120V AC 60Hz DC Power Consumption 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...

Page 6: ...bel No Favorite CH No Color Stream DVD DTV No Control Level Yes Volume Yes Brightness Yes Contrast Yes Color Yes Tint Yes Sharpness Yes Tuning No Bass No Treble No Balance No Back Light No Stereo Audio Output SAP No Video Yes Color Stream No Channel TV Cable Yes CH Label No Game Timer Yes Sleep Timer Yes Sound Mute Yes V chip Rating Yes G 8 OSD Language English French Spanish G 9 Clock and Sleep T...

Page 7: ...s 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 Yes Multi Brand Keys CH Up VCR No CH Down VCR No Pause Still No TV VCR VCR No Code No FF No Rew No Rec No Play N...

Page 8: ...Timer Max Time 120 Min Yes Stable Sound No Energy Star No Power On Memory Yes Favorite CH No G 12 Accessories Owner s Manual Language English Spanish W Warranty No Remote Control Unit Yes Rod Antenna No Poles Terminal Loop Antenna No Terminal U V Mixer No DC Car Cord Center No Guarantee Card Yes Warning Sheet No Circuit Diagram No Antenna Change Plug No Service Facility List No Important Safety In...

Page 9: ...r 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 Double Brown Dimensions W x D x H mm 546 x 526 x 472 ...

Page 10: ...ed 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 ...

Page 11: ...using 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...

Page 12: ...2 8 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 always be 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 insta...

Page 13: ...x hundreds digit value 16 x tens digit value ones digit value C 1 WHEN REPLACING EEPROM 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 reference to TABLE 1 Table 1 1 2 3 4 5 6 7 8 9 10 11 The unit will now have the correct DATA for the new MEMORY IC Enter DATA SET mode b...

Page 14: ...e Focus Volume fully counterclockwise once Adjust the Focus Volume until picture is distinct 2 2 WHITE BALANCE NOTE Adjust after performing CUT OFF adjustment 1 2 3 4 5 6 7 Place the set with Aging Test for more than 10 minutes Receive the gray scale pattern from the Pattern Generator Using the remote control set the brightness and contrast to normal position Activate the adjustment mode display o...

Page 15: ...control to set to the AV mode Then perform the above adjustments 1 3 2 10 OSD HORIZONTAL Activate the adjustment mode display of Fig 1 1 Press the VOL UP DOWN button on the remote control until the difference of A and B becomes minimum Refer to Fig 2 3 1 2 B A TV 00 OSD 28 Fig 2 3 A 2 8 SUB TINT SUB COLOR 1 2 3 4 5 6 7 8 9 Receive the color bar pattern Connect the oscilloscope to TP023 Activate th...

Page 16: ...performing adjustments in section 3 1 1 2 3 4 5 Receive the green raster pattern from color bar generator Adjust the pair of purity magnets to center the color on the screen Adjust the pair of purity magnets so the color at the ends are equally wide Move the deflection yoke backward to neck side slowly and stop it at the position when the whole screen is green Confirm red and blue color Adjust the...

Page 17: ...RTS LOCATION GUIDE WIRING CONNECTION D 4 CD101B CP802A TU001 S501A S501B FB401 CD101A CD501 AC IN CP401 CP802B CP806 C P 8 0 3 B CP801 R 8 0 7 R 8 0 3 SPEAKER TP023 TP022 CRT PCB MAIN PCB GND CRT CD801 DEGAUSS COIL CP502 L503 C R T D Y CP803A J 8 0 1 ...

Page 18: ...8 4 PUMP UP AMP 7 5 3 6 V OUT IC IC401 LA78040N E VCC RGB Proc 1 RGB MATRIX COLOR CONT ROM RAM 38 37 26 27 57 58 56 16 Hor Proc SYNC SEPA Hor VCO Hor COUNT DOWN AFC 1 H COINCIDENT AFC 2 H PHASE 1 J703 2 J702 2 DY D501 D504 RECTIFIER 3 1 4 2 L501 AC IN F501 Q507 FEED BACK T502 4 8 13 FEED BACK SW Q502 BUFFER Q501 POWER AMP 6 DEGAUSS COIL L503 6 5 MEMORY IC IC199 BR24L02F WE2 SDA SCL POWER VOL DOWN ...

Page 19: ...01 R542 C526 D503 D502 CP502 B503 D408 C521 D405 R 5 1 7 _ 1 D504 R422 D510 D513 C517_1 D505 D506 B502 D410 R410 AFC H S401 C123 OS101 J 8 0 1 COL B 8V ABL GND 25V 12V 180V HEATER FB401 R423 R538 W003 R 8 0 5 R 8 0 7 Q801_1 Q803_1 D411 C434 C401 L401 W802 Q507 W035 R417 C516 R525 Q503 W049 C507 D514 R523_1 R527_1 R607 W037 D521 C622 W061 C610 W052 W050 C527 C617 W816 W028 R405 C809 D404 W007 W008 ...

Page 20: ...29 C626 C627 C604 C104 C102 I C 1 0 1 R702 R703 R128 R126 R101 R143 R1008 R420 R419 C501 C603 R104 C108_1 C107 C105 R102 R103 R125 R609 R115 C001 R1005 R1004 R127 R116 R627 R124 R106 R105 R107 R108 R129 IC199_1 PRINTED CIRCUIT BOARDS MAIN CHIP MOUNTED PARTS SOLDER SIDE F 3 F 4 ...

Page 21: ...GND OS101 RPM7138 WH5 1 2 3 TU001 115 V KA35ARB 1 10 11 12 13 14 15 16 17 18 19 2 20 21 3 4 5 6 7 8 9 D106_1 SLR 342VCT32 POWER ON ON TIMER P CON 5V P CON 5V H_OUT H_CTL ABCL CLAMP H_CTL G OUT R OUT H_SYNC B OUT P CON B V_OUT GND V_FEEDBACK AT 5V ABCL H_OUT X RAY SDA R OUT G OUT SCL B OUT H_SYNC AFT UNREG 12V KEY1 V_OUT POWER_FAIL UNREG 12V KEY2 V_FEEDBACK X RAY GND POWER_ON AT 5V REMOCON AUDIO_OU...

Page 22: ...C503 0 001 500V B C509 0 047 M C508 0 0047 250V KX C514 680P 2KV R C511 1 50V KA C526 330 200V UP C507 10 100V MHE R513 2 2K 1 4W R506 1K 1 4W R516 10K 1 4W R505 1K 1 4W R503 100 1 4W R515 120K 1 2W R523_1 47K R527_1 5 6K R537_1 10K 1 4W R520 56K 1 4W R509 100 1 4W R512 680 1 4W R504 100 1 4W R500 2 7M 1 2W 10 R528 6 8K 1 4W R502 100 1 4W R538 1 5M 1 2W R519 1 2K 1 4W R507 100 1 4W R510_1 2 2M 1 2...

Page 23: ...330 1 2W R415 1 8K 1 2W R816 330 1 4W R413 2 2K 1 2W R419 680 R418 33K 1 4W R446 470 1 2W R423 100 1 4W R424 6 8K 1 4W R802 2 7K 1 4W R804 2 7K 1 4W R814 4 7K 1 4W R403 22K 1 4W R427 100 1 4W R405 1K 1 4W R401 27K 1 OF PRINTING AND 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 POIN...

Page 24: ...W R1005 270K R1004 100K R1008 39K R702 47K OF PRINTING AND 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 LES PIECES REPAREES PAR UN ETANT ATTENTION SINCE THESE PARTS MARKED BY CAUTION DESCRIBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE W807 W811 W812...

Page 25: ...number in the schematic diagram 3 0 5V 5ms div 4 2 20V 20µs div MICON CHROMA TUNER 1 0 5V 2ms div 5 1V 20µs div 6 1V 20µs div 1V 20µs div 7 DEFLECTION CRT 8 0 5V 5ms div 9 20V 20µs div 10 2V 20µs div 200V 20µs div 11 10V 5ms div 12 15 50V 20µs div 10V 5ms div 13 50V 20µs div 14 200mV 20µs div H 1 ...

Page 26: ...NOTE The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram 16 50V 20µs div SOUND AV 0 5V 1ms div 17 1V 1ms div 18 200mV 500µs div 19 20 500mV 20µs div H 2 ...

Page 27: ...CHANICAL EXPLODED VIEW I 1 119 119 201 201 201 201 106 PCB110 CRT PCB ASS Y 105 119 119 PCB010 MAIN PCB ASS Y 205 203 107 205 102A 202 202 202 103 202 102B 102B 102 117 101 101A 101C 101B 104 101D 204 118 ...

Page 28: ...MECHANICAL EXPLODED VIEW PACKING DIAGRAM I 2 108 113 114 115 TM101 111 116 109 109 109 109 110 110 ...

Page 29: ...OLDER ANODE WIRE 108 AE005652 791WHAA126 FILM BAG 109 AD300700 792WHAA054 PACKAGE TOP 110 AD300701 792WHAA055 PACKAGE BOTTOM 111 AE005653 793WCDC582 GIFT BOX 112 AE005654 A3M218S975 INSTRUCTION BOOK KIT 113 AE005715 JB5KD200 POLYBAG INSTRUCTION RED CAUTION 114 AE006176 J3M21802A GUARANTEE CARD 115 AE006177 J3M21821B INSTRUCTION BOOK E S 116 AE005656 723000C776 SHEET BAR CODE 117 AE005657 726000A08...

Page 30: ...10025 P2122B224M CMP 0 22 UF 275V ECQUL C506 AD301026 CD39E0M13M CC 0 001 UF 250V C508 AE002878 CD39E0MQ3M CC 0 0047UF 250V C514 BZ110172 C03L0R7U2K CC 680 PF 2KV R C515 BZ110135 E02L02222M CE 2200 UF 16V C517 BZ110203 C0PLRR7W2K CC 820 PF 2KV RR C519 BZ110207 E02LT2102M CE 1000 UF 16V C521 BZ110092 E5EZFB101M CE 100 UF 160V C526 AD301635 E51CGC331M CE 330 UF 200V C527 79091377 CQGTB04S3K CC 0 005...

Page 31: ...ISTOR SILICON KTC4217 O Y COILS TRANSFORMERS L001 BZ310136 021LA63R3K COIL 3 3 UH L401 AD301644 021L75472J COIL 4 7 MH L501 AD301395 029T000104 COIL LINE FILTER 1R0A562F20 L503 AE001529 028R200030 COIL DEGAUSS 8R200030 T401 BZ310157 045009003J TRANS HORIZONTAL DRIVE ETH09K14BZ T502 AE001531 048129109S TRANSFORMER SWITCHING 8129109S JACKS J702 AE005633 060Q401112 RCA JACK AV1 09AD 3 J703 AE005632 0...

Page 32: ...E EYF 52BCY OS101 AD301048 0773071001 REMOTE RECEIVER RPM7138 WH5 SP1001 AE005722 070Y132027 SPEAKER S08F21A TH501 AD302000 D8EE0B1400 DEGAUSS ELEMENT B59203 S1060 B14 TM101 AD301335 076N0EH020 TRANSMITTER RC EH020 TU001 AE006069 0163300018 RF UNIT 115 V KA35ARB V801 AE005638 098Y200495 CRT W DY A48LGS30X14AN35 X601 BZ613004 100CT3R505 CRYSTAL HC 49 U RESISTOR RC CARBON RESISTOR CAPACITORS CC CERA...

Page 33: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...

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