Toshiba 20A1VX Service Manual
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Toshiba 20A1VX Service Manual

Toshiba 20A1VX Service Manual

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FILE NO. 040-200116
SERVICE MANUAL

COLOUR TELEVISION

S8ER Chassis
20A1VX
Dec., 2003

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  • Page 1: Colour Television

    FILE NO. 040-200116 SERVICE MANUAL COLOUR TELEVISION S8ER Chassis 20A1VX Dec., 2003...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS ............................3 SET-UP ADJUSTMENT ............................4 SERVICE MODE ..............................6 DESIGN MODE ................................ 9 ELECTRICAL ADJUSTMENT ..........................10 CIRCUIT CHECK ..............................17 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ..........................18 LOCATION OF CONTROLS ...........................

  • Page 3: Chapter 1 General Adjustments

    CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce potentially hazardous 2. The only source of X-RAY RADIATION in this TV receiver X-RAY RADIATION.

  • Page 4: Set-Up Adjustment

    WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL. SET-UP ADJUSTMENT I The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in order as follows : 1.
  • Page 5 I CIRCUMFERENCE CONVERGENCE ADJUSTMENT CONVERGENCE ADJUSTMENTS NOTE: Before attempting any convergence adjustments, the 1. Loosen the clamping screw of deflection yoke slightly to receiver should be operated for at least fifteen min- allow the yoke to tilt. utes. 2. Temporarily put a wedge as shown in figure 1. (Do not remove cover paper on adhesive part of the wedge.) I CENTER CONVERGENCE ADJUSTMENT 3.

  • Page 6: Service Mode

    SERVICE MODE 1. ENTERING TO SERVICE MODE 1) Press o button once on 2) Press o button again to 3) While pressing the o button, Remote Control. keep pressing. press MENU button on TV set. Item Data (Service mode display) 2.
  • Page 7 4. SELECTING THE ADJUSTING ITEMS 1) Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2. (t button for reverse order) Refer to table-2 for preset data of adjustment mode. (See SETTING & ADJUSTING DATA on page 18) 5.
  • Page 8 8. SELF DIAGNOSTIC FUNCTION 1) Press “9” button on Remote Control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC’s are executed properly. 2) During diagnosis, the following displays are shown. Indicated color of mode now selected : Green and Red Indicated color of other modes : White...

  • Page 9: Design Mode

    DESIGN MODE 1. ENTERING TO DESIGN MODE 3) Press MENU button on TV. 1) Select the Service mode. 2) While pressing o (or CALL) button on Remote and press MENU button on TV. ITEM Press DATA Press (Design mode) (Adjustment mode) When QA02 is initialized, items “OPT0”...

  • Page 10: Electrical Adjustment

    ELECTRICAL ADJUSTMENT ITEM ADJUSTMENT PROCEDURE FOCUS VR ADJ. 1. Enter the service mode, then select any register item. 2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern ap- pears on the screen. 3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture screen.
  • Page 11 ITEM ADJUSTMENT PROCEDURE WHITE BALANCE 1. Set Contrast to 40, and brightness to +20 by picture control. ADJUSTMENT 2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO button. • CUTOFF ADJUSTMENT 3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual (RCUT) values to 20, and to set GDRV and BDRV to 80 with VOLUME ;...
  • Page 12 S8ER: series (Reference factory adjustments) Item. [AFT.f0] Name. AFT.f0 SETTING. IF.OUT pin (H001) 1000pF load. (IF out Round open) Input signal. SIGNAL : CW F=38.0M 95dB (µ V) (75 Ω load) Measurement place. TP-13 Adjustment method. Adjust L161 at the point that have critical change of voltage. Making standard.
  • Page 13 Item. [COLP] NO ADJUSTMENT Name. SUB-COLOR CENTER (PAL) SETTING. Input signal. Measurement place. Adjustment method. Making standard. Item. [TNTC] Name. SUB-TINT CENTER (For M-NTSC MODEL) SETTING. CHROMA ADJUSTMENT MODE Input signal. SUB-BRIGHT SIGNAL (NTSC) Measurement place. Q501 #20 (B OUT) Adjustment method.
  • Page 14 Item. [RCUT], [GCUT], [BCUT], [GDRV], [BDRV], [SCREEN VR] Name. CUT OFF/DRIVE ADJUST SETTING. [RCUT], [GCUT], [BCUT] each data set = 20H [GDRV], [BDRV] each data set = 40H EG.DEPT STD CA-100 Set to White line mode light dark light dark Input signal.
  • Page 15 FOR SECAM MODEL ONLY Item. [BELL] NO ADJUSTMENT Name. BELL FILTER SETTING. Input signal. Measurement place. Adjustment method. Making standard. Item. [SRY] Name. SECAM R-Y BLACK LEVEL. SETTING Input signal. SECAM COLOR BAR. Measurement place. Q501 #18 (R-out) Adjustment method. Adjust [SRY] the level of the monochrome signal part must be a match to the level of horizontal blanking signal.
  • Page 16 Item. [VERT POSITION] SETTING. CONTRAST=MAX. BRIGHT=CENTER COLOR=CENTER Input signal. WG Philips Pattern (Do not use French SECAM). Measurement place. On Picture Adjustment method. Adjust [VPOS] upper and lower position in Philips pattern may become a center._(Turn the direction of CPT to the south or the north when adjusting. Adjust the amount offsetting if it is not possible to do.) Item.

  • Page 17: Circuit Check

    CIRCUIT CHECKS HIGH VOLTAGE CHECK CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below. 1. Connect 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.

  • Page 18: Chapter 2 Specific Informations

    CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 20” HIGH VOLTAGE AT ZERO BEAM: 25.7 kV MAX HIGH VOLTAGE: 27.5 kV AC VOLTAGE : 110 V–240 V Table-1 SERVICE MODE ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE: Item Adjustments Reference data...

  • Page 19: Location Of Controls

    LOCATION OF CONTROLS Front VIDEO AUDIO MENU VIDEO input terminal Power switch Remote sensor Audio inpuit terminal Earphone jack Power Indicator Channel select MENU Volume down/up TV/VIDEO Select Remote control mute CALL on-screen on/off Power ON/OFF Direct Select –/-- Digit Select TV/VIDOE Select Volume down/up Position down/up...

  • Page 20: Programming Channel Memory

    PROGRAMMING CHANNEL MEMORY Auto search memory (ASM) Skip function If you set SKIP ON for unnecessary position numbers, when All the channels that can be received are preset automati- you select channels with ( / ), that position is skipped. cally.

  • Page 21: Chassis And Cabinet Replacement Parts List

    : Metal Film OMF : Oxide Metal Film : Variable Resistor : Fusible Resistor (All CD and PF capacitors are ±5%, 50V and all resistors, ±5%, 1/6W unless otherwise noted.) Model : 20A1VX Location Location Parts No. Description Parts No.
  • Page 22 Location Location Parts No. Description Parts No. Description C516 24232103 CERAMIC DISC, 50V F 0.01UF Z C902 24092345 CERAMIC DISC, 2KV 1000PF K C517 24763101 ELECTROLYTIC, 16V 100UF M C904 24436471 CERAMIC DISC, 50V SL 470PF J C521 24590104 PLASTIC FILM, 50V 0.1UF J C905 24436391 CERAMIC DISC, 50V SL 390PF J...
  • Page 23 Location Location Parts No. Description Parts No. Description R170 24366151 CARBON FILM, 1/6W 150 OHM J R663 24552221 OXIDE METAL FILM, 1/2W 220 OHM J R183 24366103 CARBON FILM, 1/6W 10K OHM J * R801 24009954 METAL FILN, 1/2W 2.2M OHM J R190 24366101 CARBON FILM, 1/6W 100 OHM J...
  • Page 24 Location Location Parts No. Description Parts No. Description RA22 24366682 CARBON FILM, 1/6W 6.8K OHM J L499 23238713 COIL, PEAKING, TRF4120AJ RA23 24366682 CARBON FILM, 1/6W 6.8K OHM J L511 23289100 COIL, PEAKING, TRF4100AF RA24 24366682 CARBON FILM, 1/6W 6.8K OHM J L525 23289100 COIL, PEAKING, TRF4100AF...
  • Page 25 Location Location Parts No. Description Parts No. Description Q830B 70391355 SCREW, BIND HEAD TAP-TITE B, D886 23316813 DIODE, EG1 BITTB 3X8 SZN D901 23357341 DIODE, 1SS133 Q840 23318299 IC, L78MR05-FA D904 23357341 DIODE, 1SS133 Q843 23114459 TRANSISTOR, RN1205 D905 23357341 DIODE, 1SS133 Q846 23114540...
  • Page 26 TUNER, HYP.MULT VS IEC-J SONY, ECA14X6 ACCESSORIES K902 23306237 REMOCON HAND UNIT, CT-9922 AT03 23588217 COVER, BATTERY, REMOCON, CT9922 Y101A 23565278 OWNER’S MANUAL, ENG, 20A1VX Y101B 23565279 OWNER’S MANUAL, VIET, 20A1VX Y120 23943846 BAG, POLY Y125 23142083 ADAPTOR Y126 23124081...

  • Page 27: Pc Boards Bottom View

    MAIN BOARD PB9329-1 CRT-D BOARD PB9329-2 BOTTOM (FOIL) SIDE BOTTOM (FOIL) SIDE Q903 M804B QB10 QB09 R921 R961 C528 G942 P496 R526 C150 Q101 R528 D905 C107 D150 R915 G941 R902 C221 R107 D224 H001 M501A C904 R922 V901A C222 C521 C902 P900...

  • Page 28: Terminal View Of Transistors

    TERMINAL VIEW OF TRANSISTORS 2SD2253 2SC3852 2SC752GTM 2SC752 2SA1788 (old) 2SD1763A 2SC2482 2SA562TM 2SC1569 2SC2655 2SA1015 2SC4544 2SC4721P 2SC1815 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 THIS PAGE IS INTENTIONALLY LEFT BLANK. ON4409 RN2203 2SD1554 2SD2599 RN2201 2SD2253 RN2004 2SD1556 RN1203 2SC5143 RN1204...

  • Page 29: Schematic Diagram

    SCHEMATIC DIAGRAM MODEL : 20A1VX WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" ON THE MANUAL FOR THIS MODEL. CAUTION: The international hazard symbols "*" in the schematic diagram and the parts list designate components which have special characteristics important for safety and should be replaced only with types identical to those in the original circuit or specified in the parts list.
  • Page 30 – 32 –...

  • Page 31: Specifications

    SPECIFICATIONS G available Television system and channel coverage (Aerial input) – not available CHANNEL SYSTEM 20A1VX PAL B/G CCIR VHF 2-12, UHF 21-69, CATV*1 PAL D/K CHINA VHF 1-12, UHF 13-57, CATV*2 PAL I UHF 21-69 SECAM B/G CCIR VHF 2-12, UHF 21-69, CATV*1...

  • Page 32: Circuit Block Diagram

    TOSHIBA CORPORATION...

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