Color Adjustments - Samsung CHA4217L Service Manual

6-3 Color Adjustments

Note 1: Color adjustment of this mode is controled
by Micom Jig or software.
Note 2: 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 CHA5**7L, use 800 x 600 mode
signal (53.7 kHz/85 Hz) for adjustments, in
case of CHA42*7L, use 640 x 480 mode signal
(43.3 kHz/85 Hz).
Before making adjustments, check that the video
signals are as follows:
Video : Analog, 0.714 Vp-p (at 75 ½ termination)
Sync : Separate TTL level
Unless otherwise specified, use 800 x 600 mode
signal (53.7 kHz/85 Hz) for adjustments.
6-3-1 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 6-3-2 through
6-3-5, adjust the Color Coordinates for 9300K to
x = 0.283 ± 0.02 and y = 0.298 ± 0.02
6-3-2 Back Raster Color Adjustment
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
Contrast:
CHA42*7L/5**7L
53.7 kHz/85 Hz (15Ó)
43.3 kHz/85 Hz (14Ó)
White flat field at
center of display area
Maximum
53.7 kHz/85 Hz (15Ó)
43.3 kHz/85 Hz (14Ó)
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 the G_CUT to center.
3. Adjust the B_CUT to set the ÒyÓ coordinate to
0.298 ± 0.02.
4. Adjust the R_CUT to set the ÒxÓ coordinate to
0.283 ± 0.02.
Note: If the above adjustments cannot be done to
each coordinate, adjust G_CUT to increase
or decrease the green cutoff and repeat
procedures 3 and 4.
6-3-3 Video Gain Adjustment
1/3H-1/2H
1/3V-1/2V
Figure 6-8. Green Box Pattern
CONDITIONS
Measurement instrument: Color analyzer
Scanning frequency:
Display image:
Brightness:
Contrast:
PROCEDURE
1. Adjust G-Gain so that the brightness of the
green gain is 40 ± 1 ft-L
(typically 40 ft-L).
6-3-4 White Balance Adjustment
Figure 6-9. Full White Pattern
6 Alignment and Adjustments
FRONT BEZEL OPENING
BACK RASTER
GREEN WINDOW
53.7 kHz/85 Hz (15Ó)
43.3 kHz/85 Hz (14Ó)
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
6-5