Samsung DP14LS Service Manual page 16

5-2 Display Control Adjustments
5-2-1 Centering
Centering means to position the center point of
the display in the middle of the display area.
Horizontal size and position and vertical size and
position control the centering of the display.
Adjust the horizontal size and vertical size to their
optimal settings: 267 mm (H) x 200 mm (V) for
15Ó, 255 mm (H) x 191 mm (V) for 14Ó
Adjust the horizontal position and vertical
position to within 4.0 mm of the center point of
the screen.
l A - B l ² 5.0 mm.
l C - D l ² 5.0 mm.
C
A
D
Figure 5-3. Centering
5-2-1 (a) HORIZONTAL MINIMUM SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
PROCEDURE
Horizontal minimum size can be adjusted as
follows using Softjig.
1. Display the timing 800 x 600/85 Hz.
2. Adjust horizontal size to minimum size using
H_SIZE.
3. Adjust horizontal minimum size to 250 mm
(15Ó) or 242 mm (14Ó) using H_SIZE MIN.
4. Adjust horizontal size to 267 mm (15Ó) or
255 mm (14Ó) using H_SIZE.
5. Press the ALL MODE SAVE horizontal
minimum size for each timing is saved
automatically.
If horizontal minimum size range cannot meet the
spec, horiontal maximum size of 640 x 480/75 Hz
including 800 x 600/60 Hz, 56 Hz, may be
saturated or cannot overscan the bezel.
DP14L*/DP15L*
DISPLAY AREA
B
EDGE OF BEZEL
53.7 kHz/85 Hz
Crosshatch pattern
Maximum
Maximum
5-2-1 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
Adjust the vertical size of the display pattern to
200 mm (15Ó) and 191 mm (14Ó).
(Tolerance: ± 3 mm.)
5-2-1 (c) HORIZONTAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
PROCEDURE
Center the test pattern on the raster.
5-2-1 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Center the test pattern on the raster.
5-2-2 Linearity
Linearity affects the symmetry of images as they
appear on the screen. Unless each row or column
of blocks in a crosshatch pattern is of equal size,
or within the tolerances shown in Tables 5-1 and
5-2, an image appears distorted, elongated or
squashed.
The formular of linearity (%)
2 x (Max – Min)
=
Max + Min
Table 5-1. Standard Modes Linearity: 800 x 600/85Hz
Each block (10 %)
Table 5-2. Other Modes Linearity: VGA, SVGA, XGA,
MAC, etc.
Each block (14 %)
5 Alignment and Adjustments
53.7 kHz/85 Hz
Crosshatch pattern
Maximum
Maximum
53.7 kHz/85 Hz
Crosshatch pattern
53.7 kHz/85 Hz
Crosshatch pattern
x 100
Standard Timing Modes
Difference between
adjacent blocks (4 %)
Supported Timing Mode
Difference between
adjacent blocks (5 %)
5-3