AOC PB20C, Service Manual

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19
6. White-Balance, Luminance adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance, please setting the Chroma-7120 MEM. Channel 1 to 9300 colors, MEM . Channel
2 to 6500 color, and MEM. Channel 3 to 9300 colors, (9300 parameter is x = 283 ± 15, y = 297 ± 15, Y = SPC. ± 7
cd/m2; 6500 parameter is x = 313 ± 15, y = 329 ± 15, Y = SPC.± 7 cd/m
2
)
PC PC AV
Color Temp. 9300 6500 9300
x 0.283 0.313 0.283
y 0.297 0.329 0.297
Y
250
±
7 250
±
7 290
±
20
How to setting MEM.channel you can reference to Chroma-
7120 user guide or simple use “
SC
” key and “
NEXT
” key
to modify x,y,Y value and use “
ID
” key to modify the TEXT description
Following is the procedure to do white-balance adjust
˙
Press Number key 100

9

9

9 will into the factory mode, and press Menu key the OSD will show menu and a
word F at Right top of Menu .
˙
In the factory mode select MORE function will into Bias and Gain adjustment.
1. ADC Adjustment:
AL

Auto level adjust.
RG, GG, BG

R, G, B Gain adjusts.
RB, GB, BB

R, G, B Bias adjusts.
2. SCALER Adjustment:
CO, BR

Contrast and Brightness adjust.
RG, GG, BG

R, G, B Gain adjusts.
RB, GB, BB

R, G, B Bias adjusts.
S9, S6, ST, SH

Save 9300, 6500, 9300 color temperature.
R9, R6, RT, RH

Recall 9300, 6500, 9300-color temperature.
BI

Setup Burn-in mode ON / OFF.
ISP

Set ISP ON/OFF.
PP

Set PIP ON/OFF.
WH

Set Wireless Headphone ON/OFF.
SR

Set SRS ON/OFF.
CC

Set Close Caption ON/OFF.
VC

Set V Chip ON/OFF.
EX

Exit MORE function to factory mode menu.
II. Bias (Low luminance) adjustment:
1. Press “ AUTO” button,
2. Set the contrast on OSD window to the
value=51, color (user) R, G, B set to “
50
”
3. Adjust the brightness on OSD until chroma 7120 measurement reach the value Y>390 cd/m
2
III. Gain adjustment:
A. Adjust 9300 color-temperature:
1. Set the Contrast of OSD function to 45 and Adjust Brightness to chroma-7120 Y>230 cd/m
2
2. Switch the chroma-7120 to RGB-mode
(with press “MODE” button)
3. Switch the MEM.channel to Channel 01 (with up or down arrow on chroma-7120)
4. The lcd-indicator on chroma-7120 will show x = 283 ± 15, y = 297 ± 15, Y =250 ± 7 cd/m
2
5. Adjust the Color(user)Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100
6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value G=100
7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure (Item 5,6,7) until chroma-7120 RGB value meet the tolerance =100±2
9. Switch the chroma-7120 to xyY mod e With press
“MODE” button
10. Press Color (9300) on OSD window to save the adjustment result