Toshiba 21V53 User manual
SERVICE MANUAL
PRINTED IN UK. 2005 C
COLOURTELEVISION
21V53
TOSHIBA
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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. Selected parameter will be highlighted.
Entire service menu parameters of AK30 CHASSIS are listed below. For some of
parameters the default values are given on the same table.
USING COLOUR BUTTONS ON SERVICE MENU:
-RED BUTTON (For Stereo models only): It switches the AVL to ON or OFF
mode on service menu. AVL word is visible on service menu when AVL is on.
-GREEN BUTTON : It switched the PICTURE MODE to 4:3 or 16:9 on service
menu. It is useful when it is necessary to adjust 16:9 picture mode vertical size.
-YELLOW BUTTON : It switches to VERTICAL SCAN DISABLE mode. It is
useful to adjust screen voltage.
-BLUE BUTTON : It is used to adjust AGC and IF automatically on service menu.
OSD:
Select OSD parameter on service menu. Adjust the horizontal position of OSD to the
middle of screen, by using the reference bar on bottom of service menu.
Min. Value: 000
Max. Value: 127
Recommended Value:082
IF Adjustments:
IF1: IF Coarse Adjustment 004
IF2: IF Fine Adjustment 065
IF3: IF Coarse Adjustment for L-prime 004
IF4: IF Fine Adjustment for L-prime 065
IF NEGATIVE ADJUSTMENT (WITHOUT L’ SYSTEMS)
Set the video pattern to a PAL colour bar pattern with frequency 38.9 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. Select the standard as BG or I. (if BG is not
available) Enter service menu. Select IF1 parameter from service menu and press BLUE
(INSTALL) button from remote controller. IF adjustment will be done automatically by
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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. Select the BAND VHF-1 (S1 – S4 for PLL
tuners) and standard as L’. Enter service menu. Select IF1 parameter from service menu
and press BLUE (INSTALL) button from remote controller. IF adjustment will be done
automatically by software. See the IF indicator on service menu, it must be like on
FIGURE-1 shown below.
AGC: Automatic Gain Control
In order to do AGC adjustment, enter a 60µdBV RF signal level from channel C-12
(224.25 MHz) Select AGC parameter from service menu. Press BLUE (INSTALL)
button from remote controller. The adjustment will be done automatically by software.
See the AGC indicator on service menu, it must be 1. Check that picture is normal at
90dBµV signal level.
FIGURE-1
:1 1
IF INDICATOR AGC INDICATOR NONE
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SCREEN ADJUSTMENT: (FBT Screen)
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.
VLIN: Vertical Linearity
Enter a PAL B/G circle test pattern via RF. Change VLIN till you see circle as round as
possible.
Min. Value: 000
Max. Value: 063
Recommended Value:045
SCREEN
ADJ.POT.
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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. Check and
readjust Vertical Size item if the adjustment becomes improper after some other
geometric adjustments are done.
Min. Value: 000
Max. Value: 063
Recommended Value:030
VS1B: Vertical Size for 50 Hz / 16:9
Enter a PAL B/G circle test pattern via RF. Enter service menu and press GREEN
(PICTURE) button from remote controller to switch to 16:9 picture mode on service
menu. Change VS1B (Vertical Size) till the picture becomes 16:9 format. Check and
readjust Vertical Size item if the adjustment becomes improper after some other
geometric adjustments are done.
Min. Value: 000
Max. Value: 063
Recommended Value:056
VP1: Vertical Position for 50 Hz
Enter a PAL B/G circle test pattern via RF. Change Vertical Position till the test pattern is
vertically centered. Horizontal line at the center pattern is in equal distance both to upper
and lower side of the picture tube. Check and readjust Vertical Position item if the
adjustment becomes improper after some other geometric adjustments are done.
Min. Value: 000
Max. Value: 015
Recommended Value:010
HP1: Horizontal Position for 50 Hz
Enter a PAL B/G circle test pattern via RF. Change Horizontal Position until the picture
is horizontally centered. Check and readjust Horizontal Position item if the adjustment
becomes improper after some other geometric adjustments are done.
Min. Value: 000
Max. Value: 063
Recommended Value:035
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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.
Min. Value: 000
Max. Value: 063
Recommended Value:013
VS2B: Vertical Size for 60 Hz / 16:9
Enter an NTSC-M circle test pattern via RF or video inputs. Enter service menu and press
GREEN (PICTURE) button from remote controller to switch to 16:9 picture mode on
service menu. Change Vertical Size until the picture becomes 16:9 format. Check and
readjust Vertical Size item if the adjustment becomes improper after some other
geometric adjustments are done.
Min. Value: 000
Max. Value: 063
Recommended Value:038
VP2: Vertical Position for 60 Hz
Enter an NTSC-M circle test pattern via RF or video inputs. Change Vertical Position till
the test pattern is vertically centered. Horizontal line at the center pattern is in equal
distance both to upper and lower side of the picture tube. Check and readjust Vertical
Position item if the adjustment becomes improper after some other geometric adjustments
are done.
Min. Value: 000
Max. Value: 015
Recommended Value:012
HP2: Horizontal Position for 60 Hz
Enter an NTSC-M circle test pattern via RF or video inputs. Change Horizontal Position
till the picture is horizontally centered. Check and readjust Vertical Size item if the
adjustment becomes improper after some other geometric adjustments are done.
Min. Value: 000
Max. Value: 063
Recommended Value:030
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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.
Min. Value: 000
Max. Value: 063
Recommended Value:007
4:3 50Hz GEOMETRY ADJ.
16:9 50Hz GEOMETRY ADJ. 16:9 60Hz GEOMETRY ADJ.
4:3 60Hz GEOMETRY ADJ.
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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.
WR: White Point Adjustment for RED
Use this parameter to set the strength of RED in White.
Min. Value: 000
Max. Value: 063
JVC Default: 040
WG: White Point Adjustment for GREEN
Use this parameter to set the strength of GREEN in White.
Min. Value: 000
Max. Value: 063
JVC Default: 040
WB: White Point Adjustment for BLUE
Use this parameter to set the strength of BLUE in White.
Min. Value: 000
Max. Value: 063
JVC Default: 040
BR: Bias for RED
Use this parameter to set the strength of RED in BLACK.
Min. Value: 000
Max. Value: 063
JVC AV20&21BJ8: 030
JVC AV14BJ&BM8: 024
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BG: Bias for GREEN
Use this parameter to set the strength of GREEN in BLACK.
Min. Value: 000
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. This results in a picture with higher contrast whatever the input signal amplitude.
Besides, APR increases the contrasts of pictures with low contrast and avoids the clipping
at RGB output for pictures with high amplitude.
To enable APR, refer to OP3 in Option Bytes.
Min. Value: 000
Max. Value: 015
JVC Default: 010
The following default values are the factory settings of the corresponding items. Except
Volume, all values are restored when STANDARD button is pushed during no menu is
displayed. Volume is set to its default value only if the A.P.S. bit is set when the TV is
turned on.
BRI: Brightness
JVC AV20&21BJ8: 037
JVC AV14BJ&BM8: 035
CON: Contrast
JVC AV20&21BJ8: 035
JVC AV14BJ&BM8: 050
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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.
WG-R: White Point Adjustment for GREEN (RGB Mode)
Use this parameter to set the strength of GREEN in White for a RGB Pattern.
Default Value: Not determined by JVC yet.
WB-R: White Point Adjustment for BLUE (RGB Mode)
Use this parameter to set the strength of BLUE in White for a RGB Pattern.
Default Value: Not determined by JVC yet.
FMP1: FM Prescaler when AVL is OFF (STEREO ONLY)
Min. Value: 000
Max. Value: 127
Recommended Value:009
NIP1: NICAM Prescaler when AVL is OFF (STEREO ONLY)
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