Toshiba 20N7XE Service Manual page 11

ITEM
WHITE BALANCE
ADJUSTMENT
•
CUTOFF ADJUSTMENT
(RCUT)
(GCUT)
(BCUT)
•
DRIVE ADJUSTMENT
(GDRV)
(BDRV)
ADJUSTMENT PROCEDURE
1. Set Contrast to 40, and brightness to +20 by picture control.
2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO
button.
3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual
values to 20, and to set GDRV and BDRV to 80 with VOLUME ; – /+ buttons.
4. Press VIDEO button on TV set and rotate Screen VR to get one slight horizontal
line on screen.
Note: Every pressing of VIDEO 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 To correct white balance in dark area,
perform fine adjustment of RCUT, GCUT
and BCUT.
– 11 –
Light area check
(to show white)
Dark area check
(to show black)