Display Control Adjustments - Samsung DP15HS/HT Service Manual

4-2 Display Control Adjustments

4-2-1 HIGH VOLTAGE ADJUSTMENT
Signal: 1024 x 768 (68 kHz/85 Hz) (17Ó)
800 x 600 (54 kHz/85 Hz) (15Ó)
Display image: DonÕt care
Contrast: Minimum
Brightness: Minimum
Limit: 26.5 kV ± 0.2 kV (17Ó)
25 kV ± 0.2 kV (15Ó)
exception) 26.0 kV ± 0.2 kV for 17Ó SDD CRT that
the DY type is DMX-1791AT
Measure the hight voltage level at the anode cap.
High voltage should be within the limit as above.
If the high voltage needs adjustment use the
following procedure.
PROCEDURE
1. Turn the power off and disconnect the AC line
cord from the power source.
2. Turn the power on after connecting high
voltage Probe.
3. Using the jig, adjust the high voltage to the
specification.
* High Voltage Adjustment PROCEDURE using Softjig
Select matching model name in ÒModelÓ field.
Select Ò @7: Zero BeamÓ in menu after
selecting ÒExtra 1Ó
Adjust high voltage using control bar after
selecting ÒHV MINÓ
Turn the power off/on after adjustment
finished.
Check the high voltage has been fixed with
adjusted value after reselecting Ò@7: Zero BeamÓ.
4-2-2 SCREEN VOLTAGE ADJUSTMENT
CONDITIONS
Signal: 1024 x 768 (68 kHz/85 Hz) (17Ó)
800 x 600 (54 kHz/85 Hz) (15Ó)
Display image: DonÕt care
Contrast: Minimum
Brightness: Minimum
Limit: 26.5 kV ± 0.2 kV (17Ó)
25 kV ± 0.2 kV (15Ó)
Screen Voltage adjustment procedure using softjig
is all the same as 4-2-1 but selecting ÒG2 CONTÓ
on the contrary to ÒHV MINÓ.
DP15H*/DP17L*
Table 4-1
CRT type
M41QAR361X11 * ( * )
M41QAQ261X11 * ( * )
M41LFQ903X28(L), etc
17"
M41EHN325X160/3F ** U
M41EHN323X160/3F ** U
M41LLJ507XX43 * (F5), (F5W3)
M41LLH507XX43 * (F5)
M36QAM351X11 * ( * )
M36LGE128X2 ** ( * )
15"
M36KUK35X02( * /LP), etc
4-2-3 CENTER RASTER
Adjust SW401 so that the back raster comes to the
center when you apply each basic mode for 15Ó
and 17Ó.
4-2-4 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: 306 mm (H) x 230 mm (V) for
17Ó, 267 mm (H) x 200 mm (V) for 15Ó.
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
A
D
Figure 4-3. Centering
* In Softjig window, ÒGeometryÓ has to be
selected for GD adjustment.
4-2-4 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
4 Alignment and Adjustments
Screen Voltage
±
480V
±
500V
±
630V
±
560V
±
600V
±
520V
|C-D| ² 4.0 mm.
DISPLAY AREA
B
EDGE OF BEZEL
68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)
Crosshatch pattern
Maximum
Maximum
10V
10V
10V
10V
10V
10V
4-3