Adjustment - LG Flatron 774FT 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 High-Voltage.
1) Display cross hatch pattern at MOde 4.
2) DIST.ADJ→CTRL PWM →High Voltage Command.
3) Adjust High Voltage to 25.8kV
3) Press Enter Key.
2. Adjustment for Factory Mode (Preset Mode).
1) Display cross hatch pattern at Mode 1.
2) Run alignment program for FB774G on the
IBM compatible PC.
3) EEPROM →ALL CLEARÆY(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 → START Æ Y(Yes) command.
6) DIST. ADJ. → CTRL PWMÆTILT command.
7) Adjust tilt as arrow keys to be the best condition.
8) DIST. ADJ. → BALANCE command.
9) Adjust parallelogram as arrow keys to be the best

ADJUSTMENT

± 0.1kVdc.
- 11 -
condition.
10) Adjust balance of pin-balance as arrow keys to be
the best condition.
11) DIST.ADJ Æ FOS.ADJ command.
12) Adjust V-SIZE as arrow keys to 200
13) Adjust V-POSITION as arrow keys to center of the
screen.
14) Adjust H-SIZE as arrow keys to 270
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) Save of the Mode 1.
19) Display from Mode 2 to Mode 4 and repeat above
from number 12) to 19).
18) PRESET EXIT → Y (Yes) command.
3. 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 B-BIAS to 127(7F)
position.Set Sub-Brightness
position.Adjust G2(Screen) command to 0.4
of the raster luminance.
8) Adjust R-BIAS and G-BIAS command to x=0.283
0.005 and y=0.298
Meter with PC arrow keys.
9) Adjust SUB-Brightness command to 0.4
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 127(7F)(decimal) position.
16) Set B-DRIVE to 100(64) at DRIVE of the alignment
program.
17-1)Adjust R-DRIVE and G-DRIVE command to white
balance x=0.283 ± 0.003 and y=0.298 ± 0.003 on the
± 4mm.
± 4mm.
to 177(B1)
±
± 0.005 on the White Balance
± 0.1FL of the
0.05FL
±