White-Balance, Luminance Adjustment - RCA L26WD23 Service Manual

26'' LCD TV
8. White Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Please select channel 03 to adjust the white balance.
Color Temp.
PC MODE
AV MODE
HDMI
COMPONENT
（480i/480p）
Note: The tolerance of the color coordinates should be less than ± 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
Note: Step of AV, HDMI, COMPONENT480i, COMPONENT480p mode adjustment is the same as PC mode,
PC mode:
Ⅰ. In the TV mode adjust volume to zero and press number key 9  8  7  6. It will achieve the
factory mode. Select the item of White Balance and press right key to enter it.
In the White Balance you can adjust 8 items.
1-3 items is RO, GO, BO  R, G, B Bias adjust.
4-6 items is RG, GG, BG  R, G, B Gain adjust.
7 item needn't adjust
8 items is color temperature select: Cool, Normal, and Warm.
Ⅱ. Bias (Low luminance) adjustment:
1. Set the raster pattern (Black pattern with 1024×768) Input.
2. Adjust the brightness on OSD until chroma 7120 measurement reach the lowest value.
Ⅲ. Gain adjustment:
A. Adjust Cold color-temperature:
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>400 cd/m2
2. Switch the chroma-7120 to RGB-mode (with press "MODE" button)
3. Switch the MEM. channel to Channel 03 (with up or down arrow on chroma-7120)
4. The LCD-indicator on chroma-7120 will show x =289, y =304, Y>200cd/m2
5. Adjust the 4 item: RG, until chroma 7120 indicator reached the value R=100
6. Adjust the 5 item: GG, until chroma-7120 indicator reached the value G=100
7. Adjust the 6 item: BG, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure until chroma-7120 RGB value meet the tolerance =100±2
9. Switch the chroma-7120 to x, y, Y mode with press "MODE" button to check the color temp is in SPEC. or not.
10. Enter the 8 item to select another color temperature to adjust.
Cold
x 289
y 304
Y 400
x 289
y 304
Y 400
x 289
y 304
Y 400
x 289
y 304
Y 400
31
Normal Warm
299 313
315 329
400 400
299 313
315 329
400 400
299 313
315 329
400 400
299 313
315 329
400 400
RCA L26WD23