Samsung LB15VS Service Manual page 18

4 Alignment and Adjustments
1. Bright should be cut off.
2. Save after adjusting : (Color coordinates x=0.312
± 0.015, y=0.329 ± 0.015
Brightness : 28 ± 1 F/L) with R, G, B gain key.
Notice : The condition for adjusting is the same as
9300K.
Don't adjust ABL to SRGB Mode
Modify with ABL.
Delete all contents and add the contents
below.
4-3-3 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS
Scanning frequency: 54 kHz/85 Hz : 15"
68 kHz/85 Hz : 17"
Display image: Full white pattern
Brightness: Cut-off
Contrast: Maximum
1. Click on the << or >> boxes next to R_GAIN and
B_GAIN to make the video white.
(For sRGB color adjustment:
x = 0.312 ± 0.02, y = 0.329 ± 0.02.)
2. Select COLOR FACTORY SAVE to save the data.
Luminance Table 4-4.
Without ABL
4-3-4 Luminance Uniformity Check
Luminance is considered uniform only if the ratio of
lowest to highest brightness areas on the screen is not
less than 7.5:10.
CONDITIONS
Scanning frequency: 54 kHz/85 Hz : 15"
68 kHz/85 Hz : 17"
Display image: White flat field
Brightness: Cut off point at 24 ft-L
Contrast: Maximum
PROCEDURE
Measure luminance at nine points on the display screen
(see figure below).
Figure 4-9. Luminance Uniformity Check Locations
4-6
4-3-5 Focus Adjustment
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
1. Adjust the Focus VR on the FBT to display the
sharpest image possible. (17" only)
2. Use Locktite to seal the Focus VR in position. (17" only)
4-3-6 Color Purity Adjustment
Color purity is the absence of undesired color.
Conspicuous mislanding (unexpected color in a
uniform field) within the display area shall not be
visible at a distance of 50 cm from the CDT surface.
28 ft-L
54 kHz/85 Hz : 15"
68 kHz/85 Hz : 17"
"H" character pattern
Cut off point
MaximumPROCEDURE
LB15VS/LB17LS/LB17KS/
LB17LT/LB17KT