Sub Brightness - Hitachi 53SDX20BB Service Manual

Adjustment preparation
(1) Start adjustment after the power is turned on for
20 minutes or more.
(2) The vertical incident illumination on the screen
should be 20 lux or less. (Room should be dark).
(3) Set the video settings (CONTRAST: max,
others: center) to standard condition.
(4) The blue defocus and cut off adjustments should
be completed.
(5) For low light white balance adjustment, input a
white raster signal level of 0.286 Vp-p
input level).
(6) For high light white balance adjustment, input a
white raster signal level of 0.715Vp-p (Video
input level).
(7) Confirm R and G Drive (cool) data is 3F.
(8) Set Video Advanced Settings-Color Temp-
erature to COOL.
Adjustment procedure
(1) Select the input signal for high brightness (Video
level = 0.715Vpp).
(2) Adjust the high brightness white balance by
changing I C menu (R and G DRV cool mode
2
only).
(3) Select the signal for low brightness (Video level
= 0.286Vpp)
(4) Adjust the low brightness white balance.
(5) Check that high brightness white balance is still
obtained. If it is not, return to step (2).
White balance =
Color coordinate =
Normal:
Warm:
2.15 Sub brightness adjustment
Adjustment preparation
(1) Start adjustment after the power is turned ON
for 20 minutes or more.
(2) Receive the color bar signal.
(3) Set video conditions to factory preset.
(4) The vertical incident illumination on the screen
should be 20 lux or less. (Room should be dark).
W
Y CY G MG R
75%
A7 A6 A5 A4 A3 A2 A1
B
C
D
Q I W 100%
(Video
10800° K ± 0 MPCD
x ...... 0.278
y ...... 0.280
7200˚K
6500˚K
BL
Should sink
to black
Should rise
BLK
slightly from
black
Adjustment procedure
(1) Go to "Sub Brightness" adjustment in I
ADJUST mode (press Input and Power button
on Control panel at same time), using Cursors
, and then Cursor
(2) Then adjust "Sub Brightness" using Cursors
to increase or decrease the value, according
to figure. (Visually adjust).
(3) After adjustment, press MENU button to exit I
ADJUST mode. (Data is stored in memory).
When selecting SUB-BRIGHTNESS mode the
Note:
microprocessor sets the CONTRAST and
COLOR to MIN. automatically, but make sure
that the other conditions are center.
Directly observe the screen by eye without using
a mirror.
35
2 C
.
,
2 C