Color Adjustments - Samsung PN19MT Service Manual

4 Alignment and Adjustments

4-3 Color Adjustments

CAUTION: Check below condition before color
adjustment Video signal : Analog 0.7
Vp-p (at 75 Ω)
Sync : TTL level (H, V seperate signal)
* Select "Color" in Softjig menu for color adjustment.
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: 68 kHz/85 Hz
Display image: White flat field at
center of display area
Luminance: Maximum
PROCEDURE
Use the directions in sections 4-3-2 through 4-3-3
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
4-3-2 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
1. Select "@1: CHANNEL 1" in right menu to
control the color for 9300K.
2. Adjust the luminance of the back raster to
between 0.5 to 0.7 ft-L using contron bar after
selecting "GREEN CUTOFF" in the menu.
3. Use control bar after selecting "BLUE
CUTOFF" in left menu to set the "y"
coordinate to 0.298 ± 0.015
4. Use control bar after selecting "RED
CUTOFF" in left menu to 0.283 ± 0.015
* If color values would not be matched desirable
values, repeat sequence 3 and 4 after readjusting
"GREEN CUTOFF" control a little different.
4-6
y = 0.298 ± 0.02
y = 0.329 ± 0.02
y = 0.359 ± 0.02
68 kHz/85 Hz
Back raster pattern
Maximum
Maximum
4-3-2 (b) R.G.B - GAIN ADJUSTMENT
1/3H-1/2H
1/3V-1/2V
Figure 4-8. White Box Pattern
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
1. Click on the << or >> box next to R,G,B
_GAIN to adjust the brightness of the Green
Gain to 36 ± 1 ft-L.
9300K to x = 0.283 ± 0.02 y = 0.298 ± 0.02
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, y = 0.298 ± 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.
4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION
CONDITIONS
Scanning frequency:
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW
68 kHz/85 Hz
White box pattern
Cut-off
Maximum
68 kHz/85 Hz
Full white pattern
Cut-off
Maximum
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW
68 kHz/85 Hz
PN19MT/MO/IO
x178/19P2