Samsung PN19LT/LO, Service Manual

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4-2-1 HIGH VOLTAGE ADJUSTMENT
Signal: 1024 x 768 (68 kHz/85 Hz)
Display image: Don’t care
Contrast:
Minimum
Brightness: Minimum
Limit: 27.0 kV ± 0.2 kV
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
①
Select matching model name in “Model” field.
➁
Select “ @7: Zero Beam” in menu after
selecting “Extra 1”
➂
Adjust high voltage using control bar after
selecting “HV MIN”
➃
Turn the power off/on after adjustment
finished.
➄
Check the high voltage has been fixed with
adjusted value after reselecting “@7: Zero Beam”.
4-2-2 SCREEN VOLTAGE CHECK
CONDITIONS
Signal: 1024 x 768 (68 kHz/85 Hz)
Display image: Full White Pattern
Contrast:
Minimum
Brightness: Minimum
Limit: 27.0 kV ± 0.2 kV
No Adjustment.
Only check with below table.
Table 4-1
4-2-3 CENTER RASTER
Adjust VR401 so that the back raster comes to the
center when you apply each basic mode.
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: 352 mm (H) x 264 mm.
Adjust the horizontal position and vertical
position to
≤
4.0 mm of the center point of the
screen.
|A-B|
≤
4.0 mm |C-D|
≤
4.0 mm
Figure 4-3. Centering
4-2-4 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
Use control bar after selecting “H-SIZE” in left
menu to adjust the horizontal size of the display
pattern to 352 mm with OSD “H-SIZE” fixed “39”.
(Tolerance: ±3 mm.)
4-2-4 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum
Use control bar after selecting “V-SIZE” in left
menu to adjust the vertical size of the display
pattern to 264 mm. (Tolerance: ± 3 mm.)
4 Alignment and Adjustments
PN19LT/LO/JT/JO 4-3
4-2 Display Control Adjustments
C
A
DISPLAY AREA
EDGE OF BEZEL
B
D
CRT Type
Screen Voltage
SDI
M46QCE261X211 540V
±
10V PN19LT/LO
SDI
M46QCK761X214
540V
±
10V
PN19JT/JO