1-28 (No.YA068)
4.10.4 VIDEO CIRCUIT
When you perform WHITE BALANCE adjustment, be sure to input a video composite signal. Moreover, set the aspect ratio to 4:3. It
is no requirement to adjust in 16:9 mode.
Item
Measuring
instrument
Test points
Adjustment part
Description
WHITE
BALANCE
LOW LIGHT
Signal
generator
SCREEN VR
[in FBT]
[WHITE BALANCE
BLOCK]
W01 : R CUTOFF
W02 : G CUTOFF
W03 : B CUTOFF
• After checking that the voltage of B1 power supply
voltage is right.
(1) Input the gray scale signal.
(2) Select the WHITE BALANCE BLOCK with
[CONTRAST/BRIGHT] button (< W/B >) from <
BLOCK SELECT > SERVICE MENU screen.
(3) Select the < W01 >~< W07 > adjust mode
with[VOLUME/ (UP)] button (< W01 >).
(4) Confirm the initial setting value of < W01 >(R
CUTOFF), < W02 >(G CUTOFF) and < W03 >(B
CUTOFF) are 50 as shown below.
(5) Exit the < W01 >~< W07 > adjust mode with [MENU]
button (< EXIT >).
(6) Select the CUTOFF adjustment mode with
[CHROMA/PHASE] button (< CUTO >) from <
WHITE BALANCE BLOCK > screen.
(7) Display the single horizontal line with [CONTRAST/
BRIGHT] button (< SERV >). Carefully adjust the
SCREEN VR to horizontal line appears faintly, not to
shine much.
(8) Gradually turn the SCREEN VR from the left to the
right direction to bring one of the red, green and blue
colors faintly visible.
(9) Then select R, G or B color with [CHROMA/PHASE]
button (< RGB >) that color except for appears first,
and adjusting 2 colors CUTOFF values, and make
single horizontal line visible white.
(10) Readjust the SCREEN VR to appear the single
horizontal line faintly.
(11) Cancel the single horizontal line with [CONTRAST/
PHASE] button (< SERV >).
(12) Exit the WHITE BALANCE BLOCK with [MENU]
button (< EXIT >).
Item
Initial setting value
<W01> R CUTOFF
<W02> G CUTOFF
<W03> B CUTOFF
50
50
50
WHITE BALANCE BLOCK
EXIT
CUTO
65-D
93-D
W01
CUTOFF
:CUTO
6500 DRIVE
:65-D
9300 DRIVE
:93-D
EXIT
DISP
<W0#>:
Setting value
indicated
SERVICE NUMBER
indicated
W01~W07 ITEM ADJUST MODE
CUTOFF ADJUSTMENT MODE
EXIT
RGB
SERV
R CUTOFF :
Select 6500 DRIVE adjustment mode
Select CUTOFF adjustment mode
Select 9300 DRIVE adjustment mode
Select W01~W07
item adjustment mode
Adjustment mode exit
Select
SERVICE NUMBER
Data operate (+/ )
Display single
horizontal line switch
Adjustment mode exit