Sharp LC-90Y8T, Service Manual

Page: 29 / 67

LC-90Y8T
5 – 12
11) WHITE BALANCE ADJUSTMENT / GAMMA ADJUSTMENT
(1) White Balance Adjustment / Gamma Adjustment
E R U D E C O R P N O I T I D N O C M E T I
1 Setting
Brightness 㸸 MAX (+16)
AV MODE: DYNAMIC
Active Backlight: off
OPC: off
*Set the luminance
meter on the center
of the screen
Regarding the details of white balance adjustment procedure,
refer to white balance adjustment spec for “Kameyama model
version 1.9”.
1. Confirm the set condition.
2. Connect the white balance jig.
3. Display the Adjustment mode screen via RS-232C command.
[ Adjustment location ]
[Caution]
The function of MURA-Reduction should be off when white
balance is adjusted and the chromaticity of “Teaching Set”
is measured.
2 Auto
Adjustment
[Command]
Adjustment mode
KRSW0001
KKT10037
Setting
KYOF0000
OSDS0001
SBSL0016
Multi point adj.
MREN0000
MSET0001
Gamma adj. mode
setting
GC6P0001
MAX Point
GCP70255
GCC7****
[ Adjustment procedure ]
1. Using the R/C, set the LCD TV to adjustment mode.
2. Set the specified level (=255) for point MAX, and measure
maximum luminance (before W/B adjustment).
Set the MAX point of the gamma adjustment to 10 times
of the measured luminance (cd/m
2 ).
3. Set the specified level for point 6, and measure the luminance.
Set the MID6 point of the gamma adjustment to 10 times of
the measured luminance (cd/m 2 ). Set the initial value to R/G/B
of point 6. Fix the strongest color in R/G/B , and adjust other
2 colors by reducing value to get “target value” of point 6.
Adjust R/G/B repeatedly until converging to “target value”.
R6/G6/B6 is R/G/B adjustment value of point6.
4. "STEP2" adjustment
Measure the luminance of point6 after #3.
This luminance is Y
WB6.
It is corrected by the reference
spectroradio meter (e.g. SR-LEDW, SR-3) and the luminance
after correcting is Y
WB6-SR3
.