Hitachi UltraVision L42S601, Service Manual

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34
4 WHITE BALANCE ADJUSTMENTS
General Notes for White Balance
(1) If the incident illumination is more than 20 lux,
change the environment (location, lighting, etc.) and
ensure it to be less than 20 lux.
(2) At least one of the color drive codes must stay at its
default value, 110.
4 .1 VIDEO COLOR TEMPERATURE ADJUSTMENT
(HIGH)
Preparation 1
(1) Set the output of signal generator to white raster.
(Ratio:100%)
(2) Component signal (480i)
Video level: 0.7
00
Vp-p
SYNC: 0.
300
Vp-p
Set-up level: 0V
(3) Input white raster signal into COMPONENT input
terminal of
the LCD set
.
(4) Set user control to Day
(Dynamic)
mode. (Picture Mode)
(5) Confirm that the mode is set as “Factory Setting
Mode”.
(6) Aspect: 4:3 Expanded
Adjustment
(1) Perform the following adjustment with the remote
control.
(2) Set the CRT color analyzer (non contact type: CA-210,
BM-5, BM-7, CA-110) at the center of the panel.
(3) Set color temperature to “HIGH”.
(4) Ensure that Adjustment R/G/B DRIVE (HIGH) are all
set as
110
.
(5) After receiving the White raster signal, reduce the value
of two (or only one) of the adjustment parameters
R/G/B DRIVE (HIGH) and adjust to the target value
Specification
Video Color temperature (HIGH)
x = 0.273 ± 0.005
y = 0.273 ± 0.005
(Color temp: 12000K-7MPCD)
Remarks
(1) Color temperature should be adjusted under the
condition in which the screen is the brightest, thus
the initial value for adjustment is set to its maximum.
(2) Adjustment is made by reducing brightness only.
Reduce a bright color for adjustment.
(3) Video color temperature & Adjustment
no.
are the
same, but addresses in the memory are different,
thus there’s no problem.
4 .2 VIDEO COLOR TEMPERATURE ADJUSTMENT
(MEDIUM)
Preparation
(1) Same as “Video Color Temperature adjustment:
(HIGH)”.
Adjustment
(1) Perform the following adjustment with the remote
control.
(2) Set the CRT color analyzer (
non contact type: CA-210,
BM-5, BM-7, CA-110) at the center of the panel.
(3) Set color temperature to “MEDIUM”.
(4) Ensure that Adjustment R/G/B DRIVE (MEDIUM) are
all set as 110.
(5) After receiving White raster signal, reduce the value
of two (or only one) of the adjustment parameters
R/G/B DRIVE (MEDIUM) and adjust to the target value
Specification
Video Color temperature (MED)
x = 0.285
±
0.005
y = 0.293
±
0.005
(
Color temp
:
9300K
)
BACK TO ADJUSTMENTS
(1) Color temperature should be adjusted under the
condition in which the screen is the brightest, thus
the initial value for adjustment is set to its maximum.
(2) Adjustment is made by reducing brightness only.
Reduce a bright color for adjustment.
(3) Video color temperature & Adjustment
no
. are the
same, but addresses in the memory are different,
thus there’s no problem.
Remarks
At least one of the data should be 110.
At least one of the data should be 110.
DW3G
(7) Allow at least 20 minutes heat-run before adjusting.
shown below.
shown below.