White-Balance, Luminance Adjustment - Lenovo L1900P Service Manual

19" LCD Color Monitor
9. White- Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance , please set the Chroma-7120 MEM Channel 3 to Reddish (6500K) color, MEM
Channel 4 to Default (7200K) color, MEM Channel 9 to Bluish (9300K) color , and MEM Channel 10 to sRGB color
( our Reddish color parameter is x = 313 ± 20, y = 329 ± 20, Y=180± 20cd/m
x = 302 ± 20, y = 318 ± 20, Y=180± 20cd/m
sRGB color parameter is x = 313 ± 20, y = 329 ± 20, Y=180± 20cd/m
How to setting MEM channel you can reference to chroma 7120 user guide or simple use " SC" key and
" NEXT" Key to modify xyY value and use "ID" key to modify the TEXT description Following is the procedure
to do white-balance adjust .
2. Setting the color temp. you want
A. MEM.CHANNEL 3 6500K (Reddish color):
Reddish color temp.parameter is x = 313 ± 20, y = 329 ± 20, Y=180± 20cd/m
B. MEM.CHANNEL 4 7200K (Default color):
Default color temp, parameter is x = 302 ± 20, y = 318 ± 20, Y=180± 20cd/m
C. MEM.CHANNEL 9 9300K (Bluish color):
Bluish color temp, parameter is x = 283 ± 20, y = 297 ± 20, Y=180± 20cd/m
D. MEM.CHANNEL 10 (sRGB color):
sRGB color temp. parameter is x = 313 ± 20, y = 329 ± 20, Y=180± 20cd/m
3. Into Factory mode of Lenovo L1900P_4431-HE1-HS1:
Press the MENU button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the
left top of the panel.
4. Bias adjustment:
Set the Contrast
5. Gain adjustment:
Move cursor to "-F-" and press MENU key
A. Adjust Reddish (6500K) color-temperature
1. Switch the chroma-7120 to RGB-Mode (with press "MODE" button)
2. Switch the MEM.channel to Channel 3 (with up or down arrow on chroma 7120)
3. The LCD-indicator on chroma 7120 will show x = 313 ± 20, y = 329 ± 20, Y=180± 20cd/m
4. Adjust the RED on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN on factory window until chroma 7120 indicator reachedthe value G=100
6. Adjust the BLUE on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure (item 4, 5, 6) until chroma 7120 RGB value meet the tolerance =100±2
2
; Bluish color parameter is x = 283 ± 20, y = 297 ± 20, Y=180± 20cd/m
to 50; Adjust the Brightness
2
; Default color parameter is
2
)
2
to 80.
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Lenovo L1900P
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2
2
2
2
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