LG PF-43A20 Service Manual Download Page 16

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Caution :

These adjustments have been factory aligned. Do not attempt
to temper with these alignments. However, the effects of
adjacent receiver components, or replacement of picture tube
or deflection yoke may require the need to readjust these
adjustments.

Raster Slant Adjustment

1. Peliminary steps

1) The lens focus and electrical focus must be provisional

alignment.

2) Tune the TV set to receive a digital pattern.
3) Press the buttons of Remote Controller for adjustment (SVC

) to reset the convergence.

2. Adjustment

1) Set only green to be appeared on the screen.
2) Carefully rotate the DY of the green CRT so that the slant

of raster become the following figure.

3) Set two color (R or B and G) to be appeared on the

screen.

4) Set the slant of Red or Blue correspond to the green.

Note :

Raster Position Adjustment

1. Preliminary steps

1) The lens focus and electrical focus must be provisional

alignment.

2) This adjustment should be performed after the raster

slant, the horizontal and the vertical adjustment.

3) Tune the TV set to receive a digital pattern.
4) The convergence must be corrected.

Press the buttons of Remote Controller for adjustment (SVC

) to reset the convergence.

2. Adjustment

1) Turn the centering magnet of Green CRT so that the center

of video signal correspond to geometrical center of screen.

2) Tune the TV set to receive cross hatch signal and turn the

centering magnet of Red & Blue so that the center of
cross hatch pattern correspond to Green center.

Lens and Electrical Focus Adjustment

1. Preliminary steps

1) The electrical focus, the raster slant and position must be

provisional alignment.

2) This adjustment should be performed after warming up

for 30 minutes and in the dark room.

3) Tune the TV set cross hatch pattern.
4) Screen the optional two lens with a cover so that the

single color is appeared on the screen.

5) When turn the light the lens at front, chromatic aberration

which appeared in bright line of cross-Hatch signal
changed as below.

After focus adjustment, fix screw about 12

17kg.cm.

2. G-lens Adjustment

1) Turn the lens until the chromatic aberration changed 'Blue'

to 'Red point'.

2) Viewing the all screen, in no case of the chromatic aberration

appeared slimly within 3.5 cross-Hatch of the picture center.
At this time, in case that the red chromatic aberration's bright
line isn't equal, adjust G-lens so that the red chromatic
aberration is appeared more than previous time.

3) Switching the signal to digital pattern and operate

adjustment minutely. At this time, adjust it by using the
revolution pattern of circumferencial picture's small circle.

4) Adjust G-focus control volume of focus pack so that the

external big circle's part appeared cleary.

5) Adjust accurately by repeat the upper control.
6) Especially, noting to the G-light because it influenced on

picture's function.

3. R-lens Adjustment

1) Turn the lens until the chromatic aberration changed

orange to scarlet.

2) Adjust the chromatic aberration so that it located center

correctly.

3) Switching the signal to digital pattern and adjust it as