LG PF-43A10 Service Manual page 18

SUB BRIGHT/COLOR/TINT adjustment
NOTE : This adjustment should be performed after White
Balance adjustment.
1) Tune the TV set to receive a broadcasting signal.
2) Adjust so that the brightness/color/TINT(for NTSC) is
optimum condition on the screen.
SECAM BELL filter adjustment
1) Tune the TV set to receive a SECAM digital pattern.
2) Adjust so that the cross-color on the 3.8MHz pattern is
minimized.
SECAM R-Y/B-Y adjustment
1) Tune the TV set to receive a SECAM digital pattern.
2) Adjust so that the background color is equal to the PAL
background color.
SECAM AMP adjustment
1) Tune the TV set to receive a SECAM digital pattern.
2) Adjust so that the level of SECAM color is equal to the
level of PAL color.
NOTE : If press OK button on Control Board continuously and
press continually two times SWAP (yellow) button on
remote controller then you can find On Screen Display
as follow Fig.5.
※ Never change these data, these are important
reference data for TV.
[ LINE SVC
PEAK LIMITER
P/N GP
SECAM GP
P/N AMP
AV-IN VOL
FM PRESCALE
NICAM VOL
SCART VOL
● Cut-off & White Balance (color temperature)
Adjustment
NOTE : This adjustment should be performed after
warming up for 15 minutes at least.
Test Point : Observing Display
Adjust : VR900R, 900G, 900B (Cut-off)
VR928R, 928G (White balance)
1) Set VR900R, 900G, 900B, 928R, 928G on CRT Boards to
the mechanical center position.
2 ] PR * *
OFF
INTIAL
INTIAL
0
044
031
108
040
Fig. 5
2) Tune the TV set to receive white pattern of PAL
standard signal.
3) Press OK button on Control Board continuously and
INPUT(blue) button on remote controller for obtaining a
horizontal line on the middle of TV screen.
4) Turn VR900R, 900G, 900B counterclockwise and set it to
the minimum position.
5) Turn VR900R, 900G, 900B clockwise slowly to appear a
horizontal line.
6) Adjust Cut-off volume (VR900R, 900G, 900B) so that the
horizontal line may become white.
First, except the appeared color on the horizontal line
with one volume and then make to be white line with the
other two volume.
7) Press OK button.
8) With a color analyer (white balance checker), adjust
VR928R and VR928G on the CRT Boards to set X position
to 285±2 and Y position to 290±2.
9) By varing contrast and brightness, whether you have
good adjustment in high and low light areas on the screen.
If not, re-adjust above setp 3)~8).
● X-RAY PROTECTOR Test
R409
3.9K
C405
4.7
50V
R406
1.2K
12V
C404
10
16V
Input 5V DC to point A and check if the TV set goes off.
- 18 -
1SD2471
D410
Q427
C3198
A
R405
18K
Q428
A1266
R401
1K
R402
10K
ZD441
3.6V
ABNORMAL
X-ray
Protector