Toshiba 20AS24 Service Manual Download Page 21

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C521

100

160V

MHE

C516

50V

C515

2200

16V

C519

1000

16V

CP503

003P-2100

CP502

A1561WV2-2P

HS501

763WSAA013

R518

5.6K

+-1%

R514

0.22 1W

S501A

S501B

IS NON POLAR ONE.

THE ALUMI ELECTROLYTIC CAPACITOR MARKED NP

THE RESISTOR MARKED F IS FUSE RESISTOR.

NOTE:

Q505

KTA1266

P.FAIL

Q503

2SA1624

PROTECT DRIVE

R501

3.3

L501

1R0A562F20

COIL,LINE FILTER

L503

8R200030

DEGAUSS COIL

FH502

EYF-52BCY

FH501

EYF-52BCY

F501

51MS040L

4A125V

IC501

LTV-817M-VB

FEED BACK

B502

W5RH3.5X5X1.0

B503

W5RH3.5X5X1.0

TH501_1

B59203-S1060-B14

4A 125V

TYPE 4A 125V (F501).

D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME

:POUR UNE PROTECTION CONTINUE LES RISQUES

ATTENTION

FUSE.

REPLACE ONLY WITH THE SAME TYPE 4A 125V (F501)

CAUTION

:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,

Q501

STP5NC50FP

POWER AMP

BLACK

WHITE

BLADE

WIDE

CD501

0R414903

AC120V_60Hz

T502

8129109S

WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL.

WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST

NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED

C514_1

680P

2KV

C513_2

0.1

C518

470P

500V

C505

0.22

275V

ECQUL

C503

0.001

500V

C509

0.047 M

C508

0.0047

250V

C502

0.001

500V

C506

0.001

250V

C501_2

0.0082

C510_1

0.033

C517

820P

2KV

C527

0.0056

C526

330

200V

C507

100V

MHE

C511

50V

R516

10K

1/4W

R505

1K 1/4W

R503

100

1/4W

R509

100

1/4W

R515

120K

1/2W

R520

56K

1/4W

R512

680 1/4W

R504

100 1/4W

R513

2.2K

1/4W

R528

6.8K

1/4W

R527

5.6K

R502

100

1/4W

R538

1.5M

1/2W

R506

1/4W

R519

1.2K

1/4W

R507

100

1/4W

R537

10K 1/4W

R500

2.7M

1/2W

+-10%

R523

47K

R510_1

2.2M

1/2W

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

W829

W832

W802

W834

W804

D509

MTZJ18B

D506

MTZJ18B

D521

MTZJ6.8B

D507

MTZJ2.2B

D528

MTZJ5.6B

D505

21DQ09N

D501

1N4005-EIC

D502

1N4005-EIC

D503

1N4005-EIC

D514

1SS133

D508

1SS133

D512

1SS133

D522

1SS133

D516

1N4937

D513

21DQ09N

D515

1SS133

D504

1N4005-EIC

D510

RU2AM-EIC

D511

1SS133

Q502

KTC3198

BUFFER

Q507

KTC3198

FEED BACK
SWITCHING

R517_1

3.3

R542

0.47

R508

220

R525

1.2 2W

GND

SOUND+B

SOUND_GND

+B
UNREG+12V

P.CON+B

GND

POWER_FAIL

X-RAY

UNREG+12V

AT+5V

GND

PCB010
TMC558

TO SOUND/AV

FROM/TO DEFLECTION/CRT

FROM/TO MICON/CHROMA/TUNER

(MAIN PCB)

TV POWER SCHEMATIC DIAGRAM

9.5

0.1

10.5

11.5

144.0

1.7

132.3

11.3

144.0

10.3

6.6

10.3

10.0

9.5

5.5

6.0

0.1

4.8

4.9

4.8

0.1

135.0

Summary of Contents for 20AS24

Page 1: ...SERVICE MANUAL COLOR TELEVISION 20AS24 FILE NO 050 200406 ...

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: ...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 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 4 G 5 G 6 G 7 G ...

Page 4: ... 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 5: ...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 6: ...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 No Stop N...

Page 7: ...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 8: ...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 Design As pe...

Page 9: ...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 10: ...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 11: ...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 12: ...6 x 16 x 16 x thousands digit value 16 x 16 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...

Page 13: ... 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 of...

Page 14: ...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 15: ...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 16: ... LOCATION GUIDE WIRING CONNECTION D 4 CD101B CP802A TU001 S501A S501B FB401 TP001 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 17: ... 4 PUMP UP AMP 7 5 2 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 SWITCHING 6 DEGAUSS COIL L503 6 5 MEMORY IC IC199 S 24C02BDP 1A SDA SCL POWER VOL DOWN ...

Page 18: ...508 Q501 R542 D503 D502 CP502 D408 C521 D405 R 5 1 7 _ 1 D504 R422 D510 D513 D505 D506 D410 R410 AFC H S401 C123 OS101 J 8 0 1 COL B 8V ABL GND 25V 12V 180V HEATER FB401 R423 R538 W003 Q801_1 Q803_1 D411 C434 C401 L401 W802 Q507 W035 R417 C516 R525 Q503 W049 C507 D514 R523 R527 R607 R603 W037 D521 C622 W061 C610 W052 W050 C617 W056 W816 W028 R405 C809 D404 W007 W008 D106_1 W029 Q105 R121 D522 R001...

Page 19: ...C629 C627 C626 C604 C104 C102 I C 1 0 1 R702 R703 R128 R126 R101 R143 R1008 R420 R419 C501_2 C603 R104 C108_1 C107 C105 R102 R103 R125 R609 R115 C001 R1005 R1004 R704 R127 R116 R627 R106 R105 R107 R108 R129 R124_1 PRINTED CIRCUIT BOARDS MAIN CHIP MOUNTED PARTS SOLDER SIDE F 3 F 4 ...

Page 20: ...6 L001_1 3 3uH Q105 KRA102MAT SWITCHING Vout B GND OS101 RPM7138 WH5 1 2 3 TU001 ENG36A01GR 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 S803X S803Y P CON 5V P CON 5V H_OUT H_CTL ABCL B OUT CLAMP H_CTL G OUT R OUT H_SYNC PROTECT P CON B V_OUT GND V_FEEDBACK AT 5V ABCL H_OUT X RAY SDA R OUT SCL G OUT B OUT H_SYNC AFT UNREG 12V AT 5V KEY1 V_OUT POWER_FA...

Page 21: ...506 0 001 250V KX C501_2 0 0082 B C510_1 0 033 B C517 820P 2KV RR C527 0 0056 B C526 330 200V UP C507 10 100V MHE C511 1 50V KA R516 10K 1 4W R505 1K 1 4W R503 100 1 4W R509 100 1 4W R515 120K 1 2W R520 56K 1 4W R512 680 1 4W R504 100 1 4W R513 2 2K 1 4W R528 6 8K 1 4W R527 5 6K R502 100 1 4W R538 1 5M 1 2W R506 1K 1 4W R519 1 2K 1 4W R507 100 1 4W R537 10K 1 4W R500 2 7M 1 2W 10 R523 47K R510_1 2...

Page 22: ...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 R804 2 7K 1 4W R814 4 7K 1 4W R811 4 7K 1 4W R809 4 7K 1 4W R403 22K 1 4W R448 680 1 2W R449 680 1 2W 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 D...

Page 23: ... 1 4W R1008 39K R701 68 1 4W R704 10 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 W...

Page 24: ...the schematic diagram WAVEFORMS 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 25: ...ollowing waveforms were measured at the point of the corresponding balloon number in the schematic diagram WAVEFORMS 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 26: ...MECHANICAL EXPLODED VIEW I 1 102A 202 202 202 103 202 102B 102B 102 201 201 201 201 106 PCB110 CRT PCB ASS Y 105 PCB010 MAIN PCB ASS Y 205 203 107 204 101 101A 101C 101B 104 101D ...

Page 27: ...MECHANICAL EXPLODED VIEW PACKING DIAGRAM I 2 108 113 114 115 TM101 111 116 109 109 109 109 110 110 ...

Page 28: ... 106 AD300759 741WUA0021 SPRING EARTH 107 BZ710260 899HV3T000 HOLDER ANODE WIRE 108 AD302402 791WHA0061 LAMIFILM BAG 109 AD300700 792WHAA054 PACKAGE TOP 110 AD300701 792WHAA055 PACKAGE BOTTOM 111 AE003266 793WCDC175 GIFT BOX 112 AE003267 A3M217J975 INSTRUCTION BOOK KIT 113 AD302406 JB5UD200 POLYBAG INSTRUCTION RED CAUTION 114 AE003268 J3J91102D GUARANTEE CARD 115 AE003269 J3M21701A INSTRUCTION BOO...

Page 29: ...025 P2122B224M CMP 0 22 UF 275V ECQUL C506 AD301026 CD39E0M13M CC 0 001 UF 250V C508 AE002878 CD39E0MQ3M CC 0 0047UF 250V C514 AD301320 C0PLRR7U2K CC 680 PF 2KV R C515 BZ110135 E02L02222M CE 2200 UF 16V C517 BZ110203 C0PLRR7W2K CC 820 PF 2KV RR C519 AD300925 E02LT2102M CE 1000 UF 16V C521 BZ110092 E5EZFB101M CE 100 UF 160V C526 AD301635 E51CGC331M CE 330 UF 200V C527 AE003233 CQGTB04S3K CC 0 0056U...

Page 30: ...2170 TRANSISTOR SILICON KTC4217 O Y COILS TRANSFORMERS L001 AD300676 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 AD300680 060Q401077 RCA JACK AV1 09D 3 J703 A...

Page 31: ... A WG26 4C BLACK 320MM S102 BZ614310 WCL6844038 FLAT CABLE AWM2468 A WG26 5C GRAY 440MM SP1001 AD300689 070Y132018 SPEAKER S08F21 TH501 AD302000 D8EE0B1400 DEGAUSS ELEMENT B59203 S1060 B14 TM101 AD301335 076N0EH020 TRANSMITTER RC EH020 TU001 AE001528 0163100007 RF UNIT ENG36A01GR V801 AD301399 098Y200484 CRT W DY A48LGS30X19N35 AD302003 100CT3R505 CRYSTAL HC 49 C RESISTOR RC CARBON RESISTOR CAPACI...

Page 32: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...

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