Color Adjustments - Samsung CKA4217L Service Manual

5-3 Color Adjustments

Note: To make color adjustments you must have a
color analyzer and one of the following
configurations:
1. Signal Generator
or
2. Computer with Samsung DM 200 software or
DisplayMate for Windows software from
Sonera Technologies
3. In case of CKA5227L, use 800 x 600 mode
signal (53.7 kHz/85 Hz) for adjustments, in
case of CKA42*7L, use 640 x 480 mode signal
(43.8 kHz/85 Hz).
Before making adjustments, check that the video
signals are as follows:
Video : Analog, 0.714 Vp-p (at 75 Ω termination)
Sync : Separate TTL level
Unless otherwise specified, use 800 x 600 mode
signal (53.7 kHz/85 Hz) for adjustments.
5-3-1 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 image:
Luminance:
PROCEDURE
Using the directions in sections 5-3-2 through 5-3-
5, adjust the Color Coordinates for 9300° K to
x = 0.283 ± 0.02 and y = 0.298 ± 0.02
5-3-2 Back Raster Color Adjustment
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
Contrast:
CKA42*7L/5227L
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
White flat field at
center of display area
Maximum
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
Back raster pattern
Maximum
Maximum
PROCEDURE
1. Adjust the Screen VR on the FBT so that the
brightness of the Back Raster is 0.3 to 0.5 ft-L
(typically 0.4 ft-L).
2. Adjust VR102R (R-Bias) and VR102B (B-Bias) so
Back Raster color is white.
(x = 0.283 ± 0.02 and y = 0.298 ± 0.02)
5-3-3 Video Gain Adjustment
1/3H-1/2H
1/3V-1/2V
Figure 5-6. Green Box Pattern
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
Contrast:
PROCEDURE
1. Adjust VR102 (G-Gain) so that the brightness
of the green gain is 40 ± 1 ft-L
(typically 40 ft-L).
5-3-4 White Balance Adjustment
Figure 5-7. Full White Pattern
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
Contrast:
5 Alignment and Adjustments
FRONT BEZEL OPENING
BACK RASTER
GREEN WINDOW
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
Green box pattern
within range for which
the ABL circuit is not
active (1/3 to 1/2H and
1/3 to 1/2V).
Maximum
Maximum
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW
53.7 kHz/85 Hz (15")
43.8 kHz/85 Hz (14")
Full white pattern
Maximum
Maximum
5-7