Toshiba 20A1VX Service Manual Download

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MAIN BOARD PB9329-1

BOTTOM (FOIL) SIDE

CRT-D BOARD PB9329-2

BOTTOM (FOIL) SIDE

T461

Q404

P570

S801

R810

T862

Q801

C810

Q301

D801

P910

R808

Q432

T401

L441

C442

C467

C444

D444

C440

D440

R441

C448

Q862

R862

D862

L862

C864

R864

R870

C873

C877

C871

ZP05

L861

C862

C869

C866

C867

R871

D864

C861

D872

R868

D876

R899

C868

Q402

C417

R411

R410

G410

C463

R412

L806

C806

L805

R866

D878

C863

D875

C860

R416

L884

D884

L888

C886

D885

R888

L886

D886

C885

C894

C893

L883

D883

C884

L885

M502A

D406

R333

C445

R448

R447

C446

R470

D302

C317

RB28

C449

D408

C310

R479

Q470

R474

C472

R471

D881

R881

R883

R884

Q883

C891

R891

D818

C470

C870

R432

Q430

R433

D846

C435

R435

D431

Q846

R848

R846

R841

C846

R473

Q818

D470

Q817

C819

D370

C371

Q819

R816

R817

R819

R370

C308

Q370

R227

R372

C370

R374

G218

R371

CB21

QB21

CB20

RB27

C410

D441

R373

G303

C311

C314

C309

C306

C313

L301

R306

C320

C305

R307

R304

R305

R312

R336

R375

R313

QB20

R301

RB20

L887

QS01

QV10

Q310

Q311

QT04

R310

R818

C801

P802

C814

C813

R156

MENU

PV01

H001

C106

C104

C105

L101

C102

C101

L102

R102

R116

C103

C117

R119

R118

PV01

CV10

CS02

RS05

RS02

CS08

RS03

RV13

RV11

RV12

QT01

T12

T13

RT16

RT15

LT04

LT05

LT06

T07

LT97

T97

R314

LT98

T99

T05

CT03

CT02

CT08

CT07

CT05

LT10

XT01

CT14

T17

T02

T01

CT01

CT04

LT02

CT16

QT05

T20

LT03

CT10

CT09

LT08

T15

T21

CT15

DT04

DT03

DT01

DT02

KB01

SA01

QA02

DB01

SA02

SA03

SA04

SA05

Q840

QB03

RB03

QB30

RA61

RA65

RA64

RA14

RB43

DB30

RA04

RA35

RA02

Q843

RA08

QB01

RB11

RB01

RA05

CB01

RB09

CA68

CA69

RB44

QB40

RA19

RB45

RA15

GA02

RA33

CA10

RA73

RA71

RA72

RA70

RA16

RA17

RA18

C843

C842

C841

R840

RA06

RA13

RA12

CH UP

CH DN

D
N

U
P

VIDEO

SA05

SA06

P661

XA01

DA42

CA42

CA43

LA01

RA22

RA23

RA24

RA25

RA26

RA27

CA33

RA36

RA68

RA37

RB26

RB22

CA37

CA38

RA38

RA67

RA40

RA41

RA74

C613

C110

Q102

D103

C113

R113

C114

R108

C111

D101

D102

C112

Q620

C612

P601

Q612

R612

D612

R663

R114

C115

R115

Z130

R153

R152

D150

C129

Q101

L103

R107

R105

C107

C118

R101

G106

R154

C108

Q130

R157

R151

C150

Q830

C182

C167

R622

C621

C615

RS06

C168

L161

Q621

R134

D830

R831

Q421

C421

D421

R421

R830

C832

X501

R180

C180

C526

C527

C521

C433

R183

R523

C528

C524

R230

C221

R228

R229

C222

M501A

D224

C224

RA31

RA32

C323

L525

C430

C431

C223

R434

L430

D403

C511

R402

V901A

M502B

M501B

R903

Q901

R902

R901

Q903

G942

C971

D905

C905

D904

C902

R963

Q908

R936

R914

R961

G903

G902

R921

R925

G941

R915

C904

Q905

R929

C907

R928

G943

D906

D901

C910

C912

R938

Q907

R977

R974

R960

C913

R917

R920

R937

RV01

R405

C409

Q560

C516

C512

Q109

R166

Q110

C161

R167

R133

C162

C517

C513

C404

L511

C216

R216

Z105

Z107

Z108

Z106

Z103

Z101

L106

Z102

L107

R130

R129

Q107

R123

Q111

R126

R144

R137

R403

C212

Q106

R124

R121

R120

Q105

R122

V02

C123

C213

C570

R212

R211

Q108

Q210

C562

C561

C564

R563

C568

L562

C566

C565

R125

C563

D301

R442

Q872

R861

R860

G882

C889

RA03

RA76

R218

C567

C307

C420

C437

R621

R210

C226

C805

D620

C606

R608

R606

C608

D601

C610

R607

C614

C609

R603

R605

C611

C607

Q611

Q501

R141

R143

R142

R140

R922

R904

R905

MCL-437F

LB01

R127

R138

R139

C122

R407

R526

R528

C899

C898

QA01

RA09

RA10

D433

F801 T3.15A L/250V

F470

T500mA L/250V

C616

T30

RA60

QB09

QB10

R117

C116

G316

R209

Q209

R191

Q112

D622

D621

RA75

RB61

QB60

QB61

BRAWN

BLUE

P495

P496

P497

P498

CAUTION LIVE AREA

P401

M804A

P803

M804B

TP15

TP13

C811

PV02

D877

D303

C318

G883

D498

D499

D110

DS01

D111

C401

R565

R566

C897

P900

T801

T802

GA24

GA21

GA22

GA23

RA21

CA25

CA24

CA22

C190

C432

D201

R308

L499

C301

R568

Summary of Contents for 20A1VX

Page 1: ...SERVICE MANUAL COLOUR TELEVISION Dec 2003 FILE NO 040 200116 S8ER Chassis 20A1VX ...

Page 2: ...ODE 6 DESIGN MODE 9 ELECTRICAL ADJUSTMENT 10 CIRCUIT CHECK 17 CHAPTER 2 SPECIFIC INFORMATIONS SETTING ADJUSTING DATA 18 LOCATION OF CONTROLS 19 PROGRAMMING CHANNEL MEMORY 20 CHASSIS AND CABINET REPLACEMENT PARTS LIST 21 PC BOARDS BOTTOM VIEW 27 TERMINAL VIEW OF TRANSISTORS 29 CIRCUIT BLOCK DIAGRAM 32 SPECIFICATIONS END APPENDIX CIRCUIT DIAGRAMS ...

Page 3: ...assis have special safety related characteristics These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts which have these special safety char acteristics are identified in this manual and its supplements electrical components hav...

Page 4: ...NVERGENCE MAGNET ASS Y 29 1mm 28 29 25mm 25 19mm 19 20 21 14mm 13 14 Figure 1 COLOR PURITY ADJUSTMENT NOTE Before attempting any purity adjustments the receiver should be operated for at least fifteen minutes 1 Demagnetize the picture tube and cabinet using a degauss ing coil 2 Set the brightness and contrast to maximum 3 Use a green raster from among the built in test signals 4 Loosen the clamp s...

Page 5: ...1 Do not remove cover paper on adhesive part of the wedge 3 Tilt front of the deflection yoke up or down to obtain better convergence in circumference See figure 3 Push the mounted wedge into the space between picture tube and the yoke to fix the yoke temporarily 4 Put other wedge into bottom space and remove the cover paper to stick 5 Tilt front of the yoke right or left to obtain better conver g...

Page 6: ...ent menu mode ON OFF MENU button on TV Initialization of the memory QA02 CALL CHANNEL button on TV s Reset the count of operating protect circuit to 00 CALL CHANNEL button on TV t RCUT selection 1 button GCUT selection 2 button BCUT selection 3 button CNTX or SCNT selection 4 button COLC selection 5 button TNTC selection 6 button Test audio signal ON OFF 1kHz 8 button Self diagnostic display ON OF...

Page 7: ...r item 2 Press and hold the CALL button on the Remote then press the CHANNEL s button on the TV The initialization of QA02 has been complated 3 Check the picture carefully If necessary adjust any adjustment item above Perform Auto search Memory on the owner s manual CAUTION Never attempt to initialize the data unless QA02 has been replaced 7 TEST SIGNAL SELECTION Every pressing of a button on the ...

Page 8: ...ow selected Green and Red Indicated color of other modes White Green Normal Red The microcomputer operates to provide judgement of no video signal The red color is still indicated though the signal is input failure may exist in input signal line including QV01 QV01 In case of indication green Normal In case of indication red with input signal Failure may exist in output line including QV01 NOTE Co...

Page 9: ...on in the design mode changes the adjustment items in the order of table 3 Refer to table 3 for data of design mode See SETTING ADJUSTING DATA on page 18 3 ADJUSTING THE DATA Pressing of VOLUME s or t button will change the value of data When QA02 is initialized items OPT0 and OPT1 of DESIGN MODE are set to the data of the representative model of this chassis family Therefore because ON SCREEN spe...

Page 10: ... the difference between the belt of vertical retrace and the border of black portion of inside pattern is visible After that return vertical height and contrast ITEM ADJUSTMENT PROCEDURE Belt of vertical retrace HORIZONTAL POSITION ADJUSTMENT HPOS VERTICAL POSITION ADJUSTMENT VPOS 1 Set the TV in service mode and get black or white cross bar signal with VIDEO button on remote hand unit 2 Select ei...

Page 11: ... button provides Horizontal line picture and Normal picture alternately 5 Press VIDEO button to release horizontal line picture and select the two other colors which did not light in the above step with CHANNEL s t buttons Then tap VOLUME buttons so that three colors slightly light in the same level X To correct white balance in light area select GDRV and BDRV with CHANNEL s t buttons to adjust X ...

Page 12: ...pin H001 1000pF load IF out Round open Input signal CW F 38 0M 95dB µ V 75 Ω load Measurement place TP 15 Adjustment method Adjust the sub address RAGC Making standard 4 0V 2V Item SCNT NO ADJUSTMENT Name SUB CONTRUST SETTING Input signal Measurement place Adjustment method Making standard Item BRTC Name SUB BRIGHT CENTER SETTING Set user control setting to STANDERD 1 Input signal SUB BRIGHT SIGNA...

Page 13: ...C Measurement place Q501 20 B OUT Adjustment method The 5th position to the 6th level of B Y signal and the 7th level difference should regu late to 2 1 Making standard 5 0 5 Note Adjust before COLC Item COLC Name SUB COLOR CENTER NTSC PAL SETTING CHROMA ADJUSTMENT MODE Input signal SUB BRIGHT SIGNAL NTSC For M NTSC MODEL SUB BRIGHT SIGNAL PAL For OTHER MODEL Measurement place Q501 20 B OUT Adjust...

Page 14: ...es slightly Decide the position of screen VR there Raise the CUT OFF data other than the line which shines by first gradually shine point Stop in the place which shines in most white Make clear white line mode Adjust it repeatedly for both the shade part and discernment to become a correct numerical value by using proofread CA100 Making standard 103cd m2 11500K 0 0075uv 17cd m2 10500K 0 0105uv Exc...

Page 15: ...s item after adjust COLS Making standard 0 40mV p p Item SBY Name SECAM B Y BLACK LEVEL SETTING Input signal SECAM COLOR BAR Measurement place Q501 20 B out Adjustment method Adjust SBY the level of the monochrome signal part must be a mutch to the level of horizontal blanking signal Adjust this item after adjust COLS Making standard 0 40mV p p Item COLS Name SUB COLOR CENTER SECAM SETTING CHROMA ...

Page 16: ...etting if it is not possible to do Item V HEIGHT SETTING CONTRAST MAX BRIGHT CENTER COLOR CENTER Input signal WG Philips Pattern Do not use French SECAM Measurement place On Picture Adjustment method Adjust the sub address HIT of Philips pattern may hide frag of the upper and lower sides in exactly Item HORIZONTAL POSITION SETTING CONTRAST MAX BRIGHT CENTER COLOR CENTER Input signal WG Philips Pat...

Page 17: ...an accurate high voltage meter to the second anode of the picture tube 2 Turn on the receiver Set the BRIGHTNESS and CONTRAST controls to minimum zero beam current 3 High voltage must be measured below B kV Refer to table 1 for high voltage B See SETTING ADJUSTING DATA on page 18 4 Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any conditio...

Page 18: ... PAL SUB COLOR CEN SECAM Y SUB CONTRAST 20H 20H 20H 40H 40H 3FH 40H 40H 40H 00H 40H 08H SERVICE MODE ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE DESIGN MODE ADJUSTING ITEMS AND DATAS IN THE DESIGN MODE Data Item Name of adjustment Preset Data Remarks Table 3 There are no adjustment in the DESIGN MODE Table 2 Item Adjustments Reference data Item Adjustments Reference data HPOS VPSO HIT VLIN VSC S...

Page 19: ...itch Remote sensor Power Indicator Channel select Volume down up VIDEO input terminal Audio inpuit terminal Earphone jack MENU TV VIDEO Select Digit Select Menu open mute Power ON OFF Direct Select TV VIDOE Select Volume down up Level down up Picture control Menu Select on screen on off Position down up Level down up Remote control ...

Page 20: ...m ON to OFF on step 2 above Manual fine tuning MFT Press MENU several times to display the SET UP menu screen Press t s and select MFT Press to start fine tuning Pressing fine tunes to a lower frequency pressing fine tunes to a higher frequency To turn off the menu function display instantly Press the CALL button X Please refer to the owner s manual in detail Method 1 When Channel 12 is not preset...

Page 21: ...1 ELECTROLYTIC 35V 100UF M 3A C323 24538474 PLASTIC FILM 50V 0 47UF J C370 24794101 ELECTROLYTIC 16V 100UF M C371 24794220 ELECTROLYTIC 16V 22UF M C403 24590472 PLASTIC FILM 50V 4700PF J C404 24797478 ELECTROLYTIC 50V 0 47UF M C408 24590183 PLASTIC FILM 50V 0 018UF J C409 24212221 CERAMIC DISC 50V B 220PF K C410 24693472 PLASTIC FILM 100V 4700PF J C417 24214102 CERAMIC DISC 500V B 1000PF K C420 24...

Page 22: ... 0 1UF D C893 24092338 CERAMIC DISC 2KV R 270PF K C894 24092338 CERAMIC DISC 2KV R 270PF K C897 24212471 CERAMIC DISC 50V B 470PF K C898 24538224 PLASTIC FILM 50V 0 22UF J C899 24212271 CERAMIC DISC 50V B 270PF K C902 24092345 CERAMIC DISC 2KV 1000PF K C904 24436471 CERAMIC DISC 50V SL 470PF J C905 24436391 CERAMIC DISC 50V SL 390PF J C907 24436561 CERAMIC DISC 50V SL 560PF J C910 24669478 ELECTRO...

Page 23: ...RBON FILM 1 6W 100K OHM J R612 24366103 CARBON FILM 1 6W 10K OHM J R621 24366222 CARBON FILM 1 6W 2 2K OHM J R622 24366101 CARBON FILM 1 6W 100 OHM J R663 24552221 OXIDE METAL FILM 1 2W 220 OHM J R801 24009954 METAL FILN 1 2W 2 2M OHM J R808 24019476 THERMISTOR POSITIVE AC290V 18 OHM M R810 24569229 CEMENT 10W 2 2 OHM J R816 24366471 CARBON FILM 1 6W 470 OHM J R817 24366331 CARBON FILM 1 6W 330 OH...

Page 24: ...EAKING 0 56MMH K 0405TYPE TRF4R56AF L106 23289829 COIL PEAKING TRF48R2AF L107 23289829 COIL PEAKING TRF48R2AF L110 23289180 COIL PEAKING TRF4180AF L161 23262287 COIL IF TRF1239AV L162 23289680 COIL PEAKING TRF4680AF L183 23289680 COIL PEAKING TRF4680AF L301 23103894 FILTER FERRITE BEAD TEM2011AW L430 23289470 COIL PEAKING TRF4470AF L441 23233996 COIL HORIZ LINEARITY TLN2111AC L499 23238713 COIL PE...

Page 25: ...883 23316813 DIODE EG1 D884 23316813 DIODE EG1 D885 23316813 DIODE EG1 D886 23316813 DIODE EG1 D901 23357341 DIODE 1SS133 D904 23357341 DIODE 1SS133 D905 23357341 DIODE 1SS133 D906 23357341 DIODE 1SS133 DA42 23118538 DIODE ZENER RD6 2ESA B2 DB01 23358541 DIODE LED 4343VRT DB30 23357341 DIODE 1SS133 DS01 23357341 DIODE 1SS133 MISCELLANEOUS B405 23451788 HOLDER POWER CORD 1450TE F470 23144826 FUSE C...

Page 26: ... S MANUAL VIET 20A1VX Y120 23943846 BAG POLY Y125 23142083 ADAPTOR Y126 23124081 ANTENNA ROD TT ANT07 TB CABINET PARTS A201 23540700 COVER FRONT COVER ASSY 20A1VX A975085E A263 23430419 FILTER 2077SERIES 2077TM A264 23836494 SPRING A270 23445492 BUTTON CONTROL BUTTON 20A1E B975027E 20A1 A271 23445490 BUTTON POWER BUTTON 20A1E C975059E 20A1 A510 23030988 SCREW SELEF TAPPING CLAW WASHER BRBTBS5X25LW...

Page 27: ...A27 CA33 RA36 CA RA68 RA37 RB26 RB22 CA37 CA38 RA38 RA67 RA40 RA41 RA74 C613 C110 Q102 D103 C113 R113 C114 R108 C111 D101 D102 C112 Q620 C612 P601 Q612 R612 D612 R663 R114 C115 R115 Z130 R153 R152 D150 C129 Q101 L103 R107 R1 R105 C107 C118 R101 G106 R154 C108 Q130 R157 R151 C150 1 5 6 10 E B E B Q830 C182 C1 L1 C167 C1 L1 R622 C621 C615 RS06 CS C168 L161 C1 Q621 R134 D830 R831 Q421 C421 D421 R421 ...

Page 28: ...86A 2SC752GTM 2SC2482 2SC2655 2SC4721P 2SC752 2SA562TM 2SA1015 2SC1815 2SC2878 2SC1740S 2SC2120 2SA9335 2SA1788 RN2203 RN2201 RN2004 RN1203 RN1204 RN2204 RN1205 RN1202 RN1201 2SD1554 2SD2253 2SD1556 2SC5143 E C B B C E B CE BCE E C B E C B B C E B C E ON4409 2SD2599 THIS PAGE IS INTENTIONALLY LEFT BLANK ...

Page 29: ... are 1 6W and 5 tolerance carbon resistor unless otherwise noted as the following marks 1 2R Metal or Metal oxide of 1 2 watt 1 2S Carbon compsistion of 1 2 watt 1RF Fuse resistor of 1 watt 10W Cement of 10 watt K 10 G 2 F 1 2 CAPACITOR Unless otherwise noted in schematic all capacitor values less than 1 are expressed in F and the values more than 1 in pF All capacitors are ceramic 50V unless othe...

Page 30: ...VIDEO AV IN H001 MEMORY ERROR AMP µ CON OSD R G B Ys QA01 RESET I 2 C BUS CONTROL BLOCK QA02 Q840 Q801 Q862 D801 T862 Q883 CONT BRT COL VOL etc VIDEO AFT IDENT CONVERTER TRANS B VOLTAGE CHROMA VIDEO DEF A V SW VIDEO OUT Q301 Q501 V OUT Q404 T461 H OUT F B T H V D Y V H CRT AUDIO OUT Q610 Q901 Q903 Q905 HYBRID REGU LATOR I 2 C BUS ...

Page 31: ...5 5 6 0 6 5MHz NTSC 3 58 50Hz 4 5MHz 1 X Z 2 S1 S41 2 Z 1 Z 38 3 X1 X19 4 A 6 A 1 A W AA BBB Colour system Video input PAL 50 60Hz SECAM 50Hz 3 58NTSC 50 60Hz 4 43NTSC 50 60Hz 20A1VX Rated voltage 110 240V AC 50 60Hz Terminals Input Video Audio monaural TV output Video Audio monaural Speaker 6x12cm 2 Picture tube Type 20 51cm Overall picture tube measured diagonally 48cm Viewable picture tube meas...

Page 32: ...TOSHIBA CORPORATION ...

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