Adjustment - LG StudioWorks 575N 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 3.
2) Adjust voltage to 51V
2. Adjustment for High-Voltage.
1) Run alignment program for CB575C on the IBM
compatible PC.
2) Display cross hatch pattern at Mode 3.
3) DIST.ADJ→CTRL PWM → High Voltage Command.
4) Adjust High Voltage to 24.5kV
5) Press Enter Key.
3. Adjustment for Factory Mode (Preset Mode).
1) Display cross hatch pattern at Mode 3.
2) Run alignment program for CB575C on the IBM
compatible PC.
3) Power button of the monitor turn off → turn on.
4) COMMAND → START → Y(Yes) command.
5) DIST. ADJ. → CTRL PWM → TILT command.
6) Adjust tilt as arrow keys to be the best condition.
7) DIST. ADJ. → BALANCE command.

ADJUSTMENT

± 0.5Vdc with VR901.
± 0.1 kVdc.
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 310
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 4 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) COLOR ADJ. → LUMINANCE command of the
alignment program.
4) Set Brightness and Contrast to Max and ABL to
200(C8) (decimal) position.
5) Display color 0,0 pattern at Mode 3.
6) COLOR ADJ. → BIAS ADJ. command of the
alignment program.
7) Check whether green color or not at R-BIAS and B-
BIAS to min position and G-BIAS to 127(7F) to
position. Set Sub-Brightness to 80(Decimal). Adjust
G2(Screen) Volume on FBT to 0.5
raster luminance. Check it's not green color.
8) Adjust R-BIAS and B-BIAS command to x=0.283
0.005 and y=0.298
Meter with PC arrow keys.
9) Adjust SUB-Brightness command to 0.5
raster luminance.
10) Display color 15,0 box pattern (70x70mm) at Mode 3.
11) DRIVE ADJ command.
12) Set SUB-Contrast 70(46) (decimal) position.
13) Set G-DRIVE to 150(96) (decimal) at DRIVE of the
alignment program.
- 15 -
± 2mm.
± 2mm.
± 0.05FL of the
± 0.005 on the White Balance
± 0.1FL of the
±