Samsung PG19lS, Service Manual

Page: 11 / 97

4-2-1 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: 352 mm (H) x 264 mm (V).
1280 x 1024 mode (91 kHz/85Hz)
Adjust the horizontal position and vertical
position to ² 4.0 mm of the center point of the
screen.
|A-B| ² 4.0 mm. |C-D| ² 4.0 mm.
Figure 4-3. Centering
4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
Click on the << or >> box next to H_SIZE to
adjust the horizontal size of the display pattern to
352 mm. (Tolerance: ± 3 mm.)
4-2-1 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
Click on the << or >> box next to V_SIZE to
adjust the vertical size of the display pattern to
264 mm. (Tolerance: ± 3 mm.)
4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
Click on the << or >> box next to H_POSI to
center the horizontal image on the raster.
4-2-1 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
Click on the << or >> box next to V_POSI to
center the vertical image on the raster.
4-2-2 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 4-1 and
4-2, an image appears distorted, elongated or
squashed.
Table 4-1. Factory Preset Modes Linearity
Table 4-2. Other Modes Linearity: VGA, SVGA, XGA,
MAC, etc.
4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT
CONDITIONS
Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum
To adjust the Horizontal Linearity, refer to Tables
4-1 and 4-2 for the tolerance range.
Click on the << or >> box next to
H_LIN to
optimize the image.
4 Alignment and Adjustments
PG17**/PG19**/PG21** 4-3
4-2 Display Control Adjustments
C
A
DISPLAY AREA
EDGE OF BEZEL
B
D
4 : 3
5 : 4
Horizontal: 20.5~23.5
Vertical :
20.5~23.5
Horizontal: 19.18~22.07
Vertical :
20.5~23.5
Supported Timing Mode
Each block (14 %)
Difference between
adjacent blocks (5 %)
Horizontal: Less than 1.10 mm
Vertical : Less than 1.10 mm
Horizontal: Less than 1.03 mm
Vertical : Less than 1.10 mm
4 : 3
5 : 4
Horizontal: 20.9~23.1
Vertical : 20.9~23.1
Horizontal: 19.60~21.65
Vertical : 20.9~23.1
Standard Modes Linearity
Each block (10 %)
Difference between
adjacent blocks (4 %)
Horizontal: Less than 0.88 mm
Vertical : Less than 0.88 mm
Horizontal: Less than 0.82 mm
Vertical : Less than 0.88 mm