Adjustment - LG EV700 Service Manual

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
DEGAUSS 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 9.
2) Adjust voltage to 160V
2. Adjustment for High-Voltage.
1) Display cross hatch pattern at Mode 9.
2) Adjust FBT B + voltage to 25.8kV
VR701.
3. Adjustment for Factory Mode (Preset Mode).
Initial
H-Top Corner
Data
H-Bottom Corner
V-Linearity
ABL
1) Display cross hatch pattern at Mode 1.
2) Run alignment program for EV700 on the IBM
compatible PC.

ADJUSTMENT

± 0.5Vdc with VR901.
± 0.1kVdc with
(Decimal)
TSB CDT LGE CDT
18
32
22
18
98 98
150 160
3) Power button of the monitor turn off → turn on.
4) COMMAND → START → Y(Yes) command.
5) DIST. ADJ. → TILT command.
6) Adjust tilt as arrow keys to be the best condition.
7) DIST. ADJ. → BALANCE command.
8) Adjust balance of side-pincushion as arrow keys to
be the best condition.
9) DIST. ADJ. → BALANCE command.
10) Adjust parallelogram as arrow keys to be the best
condition.
11) DIST. ADJ. → FOS. ADJ command.
12) Adjust V-SIZE as arrow keys to 230
13) Adjust V-POSITION as arrow keys to center of the
screen.
14) Adjust H-SIZE as arrow keys to 315
15) Adjust H-POSITION as arrow keys to center of the
screen.
16) Adjust S-PCC (Side-Pincushion) as arrow keys to be
the best condition.
17) Adjust TRAPEZOID as arrow keys to be the best
condition.
18) Display from Mode 1 to Mode 8 and repeat above
from number 12) to 17).
19) PRESET EXIT → Y (Yes) command.
4. Adjustment for White Balance and Luminance.
1) Set the White Balance Meter.
2) Press the DEGAUSS on the OSD menu for
demagnetization of the CDT.
3) Set Brightness and SUB-Brightness to Max position
(TSB CDT), SUB-Brightness to 70(decimal) (LGE CDT).
4) Display color 0,0 pattern at Mode 7.
5) COLOR ADJ. → LUMINANCE command of the
alignment program.
6) COLOR ADJ. → BIAS ADJ. command of the
alignment program.
7) Check whether blue color or not at R-BIAS and G-
BIAS to min position and B-BIAS to 0.15
Check it's not blue color.
8) Adjust R-BIAS and G-BIAS command to x=0.281
0.01 and y=0.311
with PC arrow keys.
9) Adjust SUB-Brightness command to 0.7
raster luminance.
10) Display color 15,0 box pattern (70x70mm) at Mode 7.
11) Set Contrast and SUB-Contrast to max position.
12) DRIVE ADJ command.
13) Set B-DRIVE to 155(170, LGE CDT) (decimal) at
DRIVE of the alignment program.
- 14 -
± 2mm.
± 2mm.
± 0.01 on the White Balance Meter
± 0.1FL of the
± 0.01FL.
±