LG StudioWorks 500G, Service Manual

Page: 9 / 33

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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
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 4.
2) Adjust C999 (+) voltage to 50± 0.5Vdc.
2. Adjustment for High-Voltage.
1) Display cross hatch pattern at Mode 4.
2) DIST.ADJ
→
CTRL PWM
→
High Voltage Command.
3) Adjust High Voltage to 24.5kV
±
0.1 kVdc.
4) Press Enter Key.
3. Adjustment for Factory Mode (Preset Mode).
1) Display cross hatch pattern at Mode 1.
2) Run alignment program for CB553H on the IBM
compatible PC.
3) EEPROM
→
ALL CLEAR
→
Y(Yes) command.
<Caution> Do not run this procedure unless the
EEPROM is changed. All data in EEPROM (mode
data and color data) will be erased.
4) Power button of the monitor turn off
→
turn on.
5) COMMAND
→
PRESET START
→
Y(Yes) command.
6) DIST. ADJ.
→
BALANCE command.
7) Adjust parallelogram as arrow keys to be the best
condition.
8) Adjust balance of pin-balance as arrow keys to be
the best condition.
9) DIST. ADJ.
→
FOS. ADJ command.
10) Adjust V-SIZE as arrow keys to 200 ± 2mm.
11) Adjust V-POSITION as arrow keys to center of the
screen.
12) Adjust H-SIZE as arrow keys to 270
±
4mm.
13) Adjust H-POSITION as arrow keys to center of the
screen.
14) Adjust S-PCC (Side-Pincushion) as arrow keys to be
the best condition.
15) Adjust TRAPEZOID as arrow keys to be the best
condition.
16) Save of the Mode 1.
17) Display from Mode 2 to 4 and repeat above from
number 10) to 17)
18) 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) COLOR ADJ.
→
LUMINANCE command of the
alignment program.
4) Set Brightness and Contrast to Max position.
5) Display color 0,0 pattern at Mode 4.
6) COLOR ADJ.
→
BIAS ADJ.
→
COLOR No.
→
1
command of the alignment program.
7) Check whether green color or not at R-BIAS and G-
BIAS to min position and G-BIAS to 127(7F)
position. Sub-Brightness to 190(5A) position. Adjust
G2 (screen) command to 0.4
±
0.05FL of the raster
luminance.
8) Adjust R-BIAS and G-BIAS command to x=0.283
±
0.005 and y=0.298 ± 0.005 on the White Balance
Meter with PC arrow keys.
9) Adjust SUB-Brightness command to 0.7 ± 0.1FL of the
raster luminance.
10) Adjust repeat number 8).
11) After push the “ENTER” key.
11-1) COMMAND
→
PRESET START
→
Y(Yes) command.
12) Display color 15,0 full white pattern at Mode 4.
13) DRIVE ADJ.
→
No 1. command.
14) Set Brightness and Contrast to Max position.
15) Set SUB-CONTRAST Max 160(A0) (decimal) position.
16) Set G-DRIVE to 160(A0) at DRIVE of the alignment
program.