BGH BT2909S Service Manual page 16

3.4 White Balance Adjustment
1. Input a black and white pattern to RF input.
2. Enter P-Mode, press key "3 " to select white balance adjustment menu.
3. Use the color analyzer to measure the black side of the screen. Adjust the value of
"RC","GC" and "BC" to set the reading of the color analyzer to x=274, y=280. (11500 K).
4. Then measure the white side of the screen. Adjust the value of "RD", "GD" and "BD" to
set the reading of the color analyzer to x=274, y=280. (11500 K).
5. Repeat step 3&4 until you can get the correct reading for both black and white sides.
*Notes:
A. The "SUBB" and "SubCON" items are used to assistant the white balance adjustment.
It is the same function as the user OSD menu "Brightness" and "Contrast" items. You can
adjust these items to get the expect intensity when adjusting the white balance.
B. YUV white balance black level offset setup:
It is not need to adjust the white balance for YUV mode when production, but the
BLOR-Y, BLOG-Y and BLOB-Y items which locate in EEPROM address 0x0A, 0x0B and
0x0C need to write in the right values to set the YUV mode black level offset before
production. These offset values should be written by the PE engineer when making the
EEPROM copy for the new lot with difference tube.
Table 3.4.1: The White Balance adjustment OSD menu
OSD menu Default Value
RC 32
GC 32
BC 32
RD 37
GD 32
BD 37
BLOC
PWL
BriVSD 32
SUBB 32
SubCON 32
BRTC 31
BLOR-Y 64
BLOG-Y 62
BLOB-Y 64
3.5 Picture Geometry adjustment
Chassis Name
Issued on
Updated on
Description
R cut-off setting(BLOR)
G cut-off setting(BLOG)
B cut-off setting(BLOB)
R drive setting(WPR)
G drive setting(WPG)
B drive setting(WPB)
3 Black level offset course(BLOC)
8 Peak White Limiting
Brightness of horizontal line when
adjust G2
Sub-Brightness
YUV R -OFFSET
YUV G-OFFSET
YUV B -OFFSET
NX56-LA
2008-05-19
Brightness
Contrast
Serial No.
Page
Version
Remark
Adjust to right value
Adjust to right value
Adjust to right value
Adjust to right value
Adjust to right value
Adjust to right value
Recommended value= "8"
Don't adjust, use default
Don't adjust, use default
Same as user "Brightness"
and "Contrast" adjust
Adjust to right value
64= offset value 0 63= offset
value -1 65= offset value
＋1 Adjust to right value
Page 8 of 12
1.0