Read Sharp LC-22AD1E (serv.man7) Service Manual online
25
LC-22AD1E
(5) White balance adjustment
This adjusts the white balance at the TV input.
This adjustment is performed when the LCD is replaced and the white balance must be set.
This adjustment is performed when the LCD is replaced and the white balance must be set.
a) Bring up the pattern shown in Fig. 5-1 using a signal generator on AV1, AV2 or AV3.
b) Refer to the previous item, [2], to enter the [adjustment process mode].
c) Use the cursor “(
'
)/(
"
)” keys to bring up the second page. Select [FL12310] using the cursor
“(
'
)/(
"
)” keys, and then press the “OK” key.
You can also press the cursor “(
"
)” key to bring up the second page of the second layer.
• In this case, although the screen from the second page of [FL12310] is brought up (shown in Fig. 5-2),
make sure the CUT OFF settings for [R], [G], and [B] are [0] and the DRIVE settings for [R], [G], and [B]
are [100].
If they are not [0] and [100], set them.
are [100].
If they are not [0] and [100], set them.
• Use the cursor “(
Û
)/(
û
)” key to set them to [0] and [100].
d) Prepare and install a standard luminance meter (for example, a Minolta CA-110).
e) Use the cursor “(
'
)/(
"
)” keys to bring up the second page. Select “FL12310”, and then press the
“OK” key. Press the cursor “(
"
)” key to bring up the second page of the second layer.
f) Fig. 5-3 shows the standard adjustment value for the white balance.
g) Adjust the chromaticity of x and y for the six CUT OFF and DRIVE color items on the screen shown in Fig.
5-2. Use the cursor “(
Û
)/(
û
)” keys so that the values shown for White 80% and Gray 20% are the same
as the values shown in Fig. 5-3.
• In this case, each of the set values of R, G, and B is out of [0] or [100].
• In this case, each of the set values of R, G, and B is out of [0] or [100].
*1.The adjustment should be performed after a 30-minute aging.
*2.The CUT OFF value should be adjusted within the range of
*2.The CUT OFF value should be adjusted within the range of
±
0 ~ 25.
The DRIVE value should be adjusted within the range of
±
0 ~ 25.
h) Set the “STANDBY-OFF” / “MAIN POWER-OFF” to cancel it.
[FLI2310] : 2
R CUT OFF
0
G CUT OFF
0
B CUT OFF
0
R DRIVE
100
G DRIVE
100
B DRIVE
100
MOTION THRESH
10
VE GAIN2
2
NR
ON
NR LEVEL
2
WHITE 80% GRAY 20%
Fig. 5-1
White balance adjustment pattern
(PAL signal)
Fig. 5-2
Adjustment process menu [FL12310]
Screen from the second page of the second layer
x
y
y(ref)
WHITE 80%
0.292
0.297
154
GRAY 20%
0.26
0.256
1.797
Fig. 5-3
White balance adjustment values
Adjustment range
±
0.002
Inspection range
±
0.003
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