Toshiba 20A3VX Service Manual
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Toshiba 20A3VX Service Manual

Toshiba 20A3VX Service Manual

S1e chassis
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FILE NO. 040-200117
SERVICE MANUAL

COLOUR TELEVISION

S1E Chassis
20A3VX
Dec., 2003

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Summary of Contents for Toshiba 20A3VX

  • Page 1: Colour Television

    FILE NO. 040-200117 SERVICE MANUAL COLOUR TELEVISION S1E Chassis 20A3VX 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 ADJUSTMENTS ..........................10 CIRCUIT CHECK ..............................15 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ..........................16 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 hazard- 2. The only source of X-RAY RADIATION in this TV receiver ous 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 16) 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 colour of mode now selected : Green and Red Indicated colour 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 Adjustments

    ELECTRICAL ADJUSTMENTS 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 Initial reference data, and to set GDRV and BDRV to Initial reference (GCUT)
  • Page 12 S1E: Series (Reference factory adjustment) 1 AFT/AGC ADJUSTMENT (Measuring point) TP-13/TP-14 (Input frequency) CW: 38.00 [MHz] 95dBµV at 75Ω load (Adjusting method) 1) Open link of IF out. 2) Input 1000pf cap. to link at tuner side to ground. 3) Input frequency after link. CW: 38.00 [MHz] 95dBµ µ µ µ µ V at 75Ω Ω Ω Ω Ω load 4) Power On 5) Select RFAGC key, on screen display "RAGC OK, Coil OK"...
  • Page 13 6 SUB COLOUR NTSC (COLC) (Measuring point) Q501 #22 (B-OUT) (Adjusting signal) Sub Bright (NTSC) signal *Note: For Thailand model use Video input (Adjusting method) 1) Set BUS date of Q501 to the same value as that SUB TINT adjustment. 2) Set user control to the standard 1.
  • Page 14 9 SECAM BELL FILTER ADJUSTMENT (Measureing point) (Adjusting signal) NO ADJUSTMENT (Adjusting method) 10 SECAM R-Y ADJUSTMENT (For models M, MJ, R, TR only) (Measuring point) Q501 #20 R-Y OUT (Adjusting signal) Colour bar (SECAM) signal (Adjusting method) Adjust (SRY) the level of the monochrome signal part must be a match to the level of horizontal blanking signal.

  • Page 15: Circuit Check

    CIRCUIT CHECK 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 16: 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 AV VOLTAGE 110~240 V Table-1 SERVICE MODE ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE: Item Adjustment Reference data Data ←...

  • Page 17: Location Of Controls

    LOCATION OF CONTROLS TOSHIBA TOSHIBA MENU VIDEO AUDIO CALL Names of Parts TV Set Remote Controller Main power on/off Power on/standby Infrared sensor Direct select –/-- Power indicator Position down/up !¡ MENU Menu open Volume down/up Channel up Level down/up...

  • Page 18: Programming Channel Memory

    PROGRAMMING CHANNEL MEMORY • For easy Channel selection, the chosen Position should have the same number as Channel stored there. For this operation, you may use the “SEARCH” and “SKIP” functions. Example : Presetting Channel 12 to Position 12 Channel Preset Manual Search and Changing the assigned position Auto search memory (ASM)
  • Page 19 • Under some reception conditions, fine tuning may be necessary to improve the picture quality. In such cases, adjust the manual fine tuning (MFT). • If the signal frequency is unstable due to environmental conditions, use auto fine tuning. Skip Function Auto fine tuning (AFT) Press 7 repeatedly to display the D6 screen.

  • Page 20: Chassis And Cabinet Replacement Parts List

    • The part number must be used when ordering parts, in order to assist in processing, be sure to include the Model number and Description. • The PC board assembly with mark is no longer available after the end of the production. Model : 20A3VX Capacitors ..... CD Ceramic Disk : Plastic Film : Electrolytic Resistors ....
  • Page 21 Location Location Parts No. Description Parts No. Description C605 24232103 CERAMIC DISC, 50V F 0.01UF Z CA68 24794100 ELECTROLYTIC, 16V 10UF M C606 24797010 ELECTROLYTIC, 50V 1UF M CA69 24232103 CERAMIC DISC, 50V F 0.01UF Z C607 24797229 ELECTROLYTIC, 50V 2.2UF M CA98 24232103 CERAMIC DISC, 50V F 0.01UF Z...
  • Page 22 Location Location Parts No. Description Parts No. Description R230 24366271 CARBON FILM, 1/6W 270 OHM J R819 24366102 CARBON FILM, 1/6W 1K OHM J R233 24366100 CARBON FILM, 1/6W 10 OHM J R820 24338398 OXIDE METAL FILM, 1W 0.39 OHM J R301 24366102 CARBON FILM, 1/6W 1K OHM J...
  • Page 23 Location Location Parts No. Description Parts No. Description RA33 24366471 CARBON FILM, 1/6W 470 OHM J RS16 24366101 CARBON FILM, 1/6W 100 OHM J RA35 24366102 CARBON FILM, 1/6W 1K OHM J RS17 24366222 CARBON FILM, 1/6W 2.2K OHM J RA36 24366103 CARBON FILM, 1/6W 10K OHM J...
  • Page 24 Location Location Parts No. Description Parts No. Description * T801 23211768 COIL, LINE FILTER, TRF3244AB QV11 23314965 TRANSISTOR, KTC3198 Y * T862 23217527 TRANSFORMER, CONVERTER, TPW3485AM D101 23316411 DIODE, ZENER, HZT33-12 D111 23357273 DIODE, ZENER, DZ6.8 BS B SEMICONDUCTORS D150 23357354 DIODE, MA2C858 Q101...
  • Page 25 23445627 BUTTON, POWER BUTTON A280 23035412 SCREW, BTB4X12 SZN * A401 23540965 COVER, BACK COVER PROPER A525 23037312 SCREW, BTBW3X12SZN A701 23064680 CARTON BOX, 20A3VX A702A 23946290 PACKING, TOP PACKING, 20A3VX A702B 23946291 PACKING, BOTTOM PACKING, 20A3VX – 25 –...
  • Page 26 THIS PAGE IS INTENTIONALLY LEFT BLANK. – 26 –...

  • Page 27: Pc Boards Bottom View

    MAIN BOARD PD0394 BOTTOM (FOIL) SIDE PD0378 MCL-437F R309 QT04 M804B QT05 RT28 RT18 RT29 Q304 D150 GJ01 R303 R218 D224 L499 RT30 GJ02 C528 C526 C527 CT21 CT20 C521 C522 GJ04 C180 C523 QT07 GJ07 R170 C120 C226 Q303 CT15 GJ03 CT14...

  • Page 28: Terminal View Of Transistors

    CRT-D BOARD PD0393 TERMINAL VIEW OF TRANSISTORS BOTTOM (FOIL) SIDE 2SD2253 2SC3852 2SC752 2SA1788 2SC752GTM Q903 (old) 2SD1763A 2SA562TM 2SC2482 2SC5243 2SC1569 2SA1015 2SC2655 G942 2SC4544 2SC1815 2SC4721P R902 2SA1788 2SC2878 R925 P501 2SA1306 2SC1740S 2SA1186A 2SC2120 R915 R922 2SA9335 D905 C902 PLC2147...

  • Page 29: Schematic Diagram

    SCHEMATIC DIAGRAM MODEL : 20A3VX 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

    Monitor output : Video/Audio (stereo) Speaker : 6 x 12cm (2) Picture tube : 20A3VX : Type 20 (510.0mm) Overall picture tube measured diagonally (480.0mm) Viewable picture tube measured diagonally 90° deflection * Please refer to owner's manual in detail.

  • Page 32: Circuit Block Diagram

    TOSHIBA CORPORATION...

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