LG T910B Service Manual page 8

1. Preparation for Service Adjustment
GENERAL INFORMATION
All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several adjustments may be required.
Adjustment should be following procedure and after
warming up for a minimum of 30 minutes.
• Alignment appliances and tools.
- IBM compatible PC.
- Programmable Signal Generator.
(eg. VG-819 made by Astrodesign Co.)
- EPROM or EEPROM with saved each mode data.
- Alignment Adaptor and Software.
- Digital Voltmeter.
- White Balance Meter.
- Luminance Meter.
- High-voltage Meter.
AUTOMATIC AND MANUAL DEGAUSSING
The degaussing coil is mounted around the CDT so that
automatic degaussing when turn on the monitor. But a
monitor is moved or faced in a different direction, become
poor color purity cause of CDT magnetized, then press
DEGAUSSING on the OSD menu.
ADJUSTMENT PROCEDURE & METHOD
- Install the cable for adjustment such as Figure 1and run
the alignment program on the DOS for IBM
compatible PC.
- Set external Brightness and Contrast volume to max
position.
1. Adjustment for B + Voltage.
1) Display cross hatch pattern at Mode 4.
2) Adjust P907 voltage to 50V ± 0.2V with VR901.
2. Adjustment for High-Voltage.
1) Display cross hatch pattern at Mode 4.
2) Adjust CDT Anode voltage to 27kV ± 0.2kV with
I-P in Hot key mode.
3. Adjustment for Horizontal Raster Center.
1) Display cross hatch pattern at Mode 4.
2) Adjust the Back Raster should be center of the
screen with SW801.
ADJUSTMENT
2. Adjustment by Service Hot key
How to enter SVC HOT KEY
1. Press Menu and OSD window will appear.
2. While OSD window is displayed,
left bottom of OSD window.
3. Press
immediately refresh.
4. Press Menu and make sure that
1/2.
5. Follow the menu on the left of OSD window to find 1/2
and OSD will change as shown in the figure.
6. Select Degauss in the above figure and then press
Select and
figure. (Back Raster for Pattern)
FOS SPEC
1. Size
H : 350 4mm
V : 262 4mm
Scanning frequency : All Mode (Mode 1~4)
Display image : Crosshatch pattern
2. Centering
Scanning frequency : All Mode (Mode 1~4)
Display image : Crosshatch pattern
Horizontal : 10 Row
Vertical : 8 Row
H : L-R
3. Tilt
Scanning frequency : All Mode (Mode 1~4)
Display image : Crosshatch pattern
Horizontal : 10 Row
Vertical : 8 Row
Tilt : E-F
- 8 -
+ simultaneously and the screen will
to change the screen as shown in the
U
L
D
4mm, V : U-D 4mm
E F
2.0mm
is seen on the
is changed to
R