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Toshiba 21V53 Service Manual

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TOSHIBA
SERVICE MANUAL
COLOUR TELEVISION
21V53
PRINTED IN UK. 2005 C

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Summary of Contents for Toshiba 21V53

  • Page 1 TOSHIBA SERVICE MANUAL COLOUR TELEVISION 21V53 PRINTED IN UK. 2005 C...
  • Page 2 ENTERING TO SERVICE MENU: In order to enter service menu, first enter the main menu and then press the digits 4, 7, 2 and 5 respectively. To select adjust parameters, use  or  buttons. To change the selected parameter, use  or buttons.
  • Page 3 software. See the IF indicator on service menu, it must be like on FIGURE-1 shown belove. IF POSITIVE ADJUSTMENT (WITH L’ SYSTEMS) Set the video pattern to a SECAM-L colour bar pattern with frequency 33.9 MHz. Apply this IF signal to PIN-10 and PIN-11 of tuner. Press PROG-1 and after that BLUE (INSTALL)button from remote controller.
  • Page 4 SCREEN ADJUSTMENT: (FBT Screen) SCREEN ADJ.POT. Enter service menu by pressing “MENU” and “4, 7, 2, 5” from remote controller. Then press yellow button to disable vertical scan. Adjust screen via screen pot. For a thin horizontal line. Press yellow button again to enable vertical scan. Press “TV” button to leave service menu.
  • Page 5 VS1A: Vertical Size for 50 Hz / 4:3 Enter a PAL B/G circle test pattern via RF. Change VS1A (Vertical Size) until horizontal black lines on both the upper and lower part of the test pattern become very close to the upper and lower horizontal sides of picture tube and nearly about to disappear.
  • Page 6 VS2A: Vertical Size for 60 Hz / 4:3 Enter an NTSC-M circle test pattern via RF or video inputs. Change Vertical Size until the checkered parts of test pattern on both of upper and lower side disappear. Check and readjust Vertical Size item if the adjustment becomes improper after some other geometric adjustments are done.
  • Page 7 RGBH: RGB Mode Horizontal Shift Offset Enter a RGB circle test pattern via video inputs. Force the TV to RGB mode by pressing AV button from remote controller. Change RGB Horizontal Position till the picture is horizontally centered. Check and readjust RGBH item if the adjustment becomes improper after some other geometric adjustments are done.

  • Page 8: White Balance Adjustment

    WHITE BALANCE ADJUSTMENT The following three parameters are used to make white balance adjustment. To do this, use a Colour Analyzer. Using WR (White point adjust for RED), WG (White point adjust for GREEN), WB (White point adjust for BLUE) parameters, insert the + sign in the square which is in the middle of the screen.
  • Page 9 BG: Bias for GREEN Use this parameter to set the strength of GREEN in BLACK. Min. Value: JVC AV20&21BJ8: 031 JVC AV14BJ&BM8: 035 APR: Automatic RGB Peak Regulation (APR) Threshold The goal of the APR function (Automatic RGB peak regulation) is to compensate the spread of contrast between sources or programs by regulating the peak amplitude of RGB signals.
  • Page 10 COL: Colour JVC AV20&21BJ8: 043 JVC AV14BJ&BM8: 047 SHA: Sharpness JVC AV20&21BJ8: 06 JVC AV14BJ&BM8: 08 HUE: Hue Default Value: 31 VOL: Volume Default Value: 15 WR-R: White Point Adjustment for RED (RGB Mode) Use this parameter to set the strength of RED in White for a RGB Pattern. Default Value: Not determined by JVC yet.
  • Page 11 Min. Value: Max. Value: Recommended Value:020 SCP1: SCART Prescaler when AVL is OFF (STEREO ONLY) Min. Value: Max. Value: Recommended Value:013 FMP2: FM Prescaler when AVL is ON (STEREO ONLY) Min. Value: Max. Value: Recommended Value:013 NIP2: FM Prescaler when AVL is ON (STEREO ONLY) Min.
  • Page 12 Option Bytes: OP1: Peripheral Options NOT USED 1, Display “AV-3” as “F-AV” 0, Display “AV-3” as “B-AV” 1, Turn back TV mode after the last AV (with AV key) 0, Turn back first AV mode after the last AV 1, AV-1 S is available in AV key stream 0, AV-1 S is NOT available in AV key stream 1, RGB is available in AV key stream 0, RGB is NOT available in AV key stream...
  • Page 13 NOT USED 1, LOW POWER is available 0, LOW POWER is not available When LOW POWER is available, low power consumption is provided during Stand-by. OP3: Video Options b7-6: Xtal Configuration 00, 1 Xtal PAL 4.43 01, 2 Xtal PAL/NTSC 4.43/3.58 10, 1 Xtal PAL/SEC/NTSC 4.43 11, 2 Xtal PAL/SEC/NTSC 4.43/3.58 1, Enable Blue back when no signal in AV modes...
  • Page 14 OP4: TV Features NOT USED NOT USED 1, AK36 chassis 0, AK30 chassis 1, Hotel Mode can be activated 0, Hotel Mode cannot be activated 1, No Signal Timer is enabled 0, No Signal Timer is disabled For PLL Tuner 1, Frequency based search 0, Channel table based search (No meaning for VST Tuner)
  • Page 15 TX1: Teletext Options 1, Auto APS after Stand-By 0, no APS after Stand-By In shipping condition, APS bit is set to1 and after the TV is turned on for the first time, it’s automatically set to 0. RESERVED (must be 0) 1, Frequency item is VISIBLE in Install Menu and APS Menu 0, Frequency item is INVISIBLE in Install Menu and APS Menu b4-3: Chassis Code...