Toshiba 20A1VX Service Manual Download Page 30 | Manualshive

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GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

CIRCUIT BLOCK DIA

GRAM

~

~

–

+

TUNER

*

*

PWM

AFT

U / V

L / H

SW1

SW2

TV OUT

AUDIO

AUDIO

AUDIO

VIDEO

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

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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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