Color Adjustments - Compaq MV-920 Service Manual

4-3 Color Adjustments

4-3-1 Color Coordinates (Temperature)
Color temperature is a measurement of the
radiant energy transmitted by a color. For
computer monitors, the color temperature refers
to the radiant energy transmitted by white. Color
coordinates are the X and Y coordinates on the
chromaticity diagram of wavelengths for the
visible spectrum.
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display Size :
Display image:
Brightness:
Contrast:
PROCEDURE
Use the directions in sections 4-3-2 through 4-3-4
to adjust the color coordinates for:
9300K to x = 0.283 ± 0.02,
6500K to x = 0.313 ± 0.02,
5000K to x = 0.346 ± 0.02,
4-3-2 Color Adjustments for 9300K
4-3-2 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
1. Select COLOR CHANNEL 1 to control the
color for 9300K.
2. Adjust the luminance of the back raster to
between 0.3 to 1ft-L using the G_CUT
controls.
3. Click on the << or >> box next to B_CUT to
set the ÒyÓ coordinate to 0.298 ± 0.02.
4. Click on the << or >> box next to R_CUT to
set the ÒxÓ coordinate to 0.283 ± 0.02.
Note: If the above adjustments cannot be
done to each coordinate, click on the
<< or >> box next to G_CUT to decrease
or increase the green cutoff (bias) and
repeat procedures 2 and 3.
PG17**/PG19**/PG21**
68 kHz/85 Hz
352 (H) x 264 (V)
White flat field at
center of display area
Cut-off
Maximum
y = 0.298 ± 0.02
y = 0.329 ± 0.02
y = 0.359 ± 0.02
68 kHz/85 Hz
Back raster pattern
Cut-off
Maximum
4-3-2 (b) G-GAIN ADJUSTMENT
1/3H-1/2H
1/3V-1/2V
Figure 4-8. Green Box Pattern
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
1. Click on the << or >> box next to G_GAIN to
adjust the brightness of the Green Gain to
25 ± 1 ft-L.
Note: If you canÕt increase the Green Gain to
the appropriate value, click on the >>
box next to increase the ABL point.
4-3-2 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
Figure 4-9. Full White Pattern
1. Click on the << or >> boxes next to R_GAIN
and B_GAIN to make the video white.
(For 9300K color adjustment:
x = 0.283 ± 0.02,
Note: Do not touch the G_GAIN controls.
2. Check the ABL. If it is not within the
specifications (30 ± 1 ft-L), use the ABL
controls to adjust it.
3. Select COLOR FACTORY SAVE to save the
data.
4 Alignment and Adjustments
FRONT BEZEL OPENING
BACK RASTER
GREEN WINDOW
68 kHz/85 Hz
Green box pattern
Cut-off
Maximum
68 kHz/85 Hz
Full white pattern
Cut-off
Maximum
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW
y = 0.298 ± 0.02.)
4-5