LG RT-39NZ40RB Service Manual page 13

12) L-VL(Lower Vertical Linearity)
Adjust vertical linearity of lower screen
13) VL (Vertical Linearity)
Adjust the top/bottom size of circle to be same in the EU 05CH.
14) SC (Vertical ÒSÓ Correction)
Adjust so that all distance between each horizontal lines are
to be the same.
15) V-ASP(Vertical Aspect Ratio)
Adjust the vertical aspect ratio.
16) Store the adjusted data in EEPROM by pressing the ÒOKÓ
key before exiting adjustment mode.
17) Exit the Adjustment mode by pressing the ÔTV/AVÕ key.
3. NTSC Mode Deflection Adjustment
1) Adjust vertical size (VA Adjustment) until fifth vertical bar
from upper and lower center screen is accord with the edge
of the frame.
2) Adjust horizontal size (EW Adjustment) until third bar to
indicate horizontal size of circle is accord with the edge of
the frame.
3) Do other adjustments the same as in PAL mode.
Fourth Vertical Line
Lens Focus & Electronic Focus Adjustment
O
1. Preliminary steps
1) Electronic focus,Raster slope & Raster position must be pre-
adjusted.
2) Heat-run over 60 minutes.
3) Receive Crosshatch pattern.
(PAL:EU07(PR 8) or NTSC:09CH(PR 13))
* Note: Loosen the butterfly nut in the lens tub slightly,being
careful that it is mot loosened to the point that the lens can
move out of focus.
4) Adjustment must be done in a dark room(simple dark room)
Be careful not to touch the lens during adjustment.
5) Make any one color raster using lens covers.
6) Rotating lens right from the front side chromatic haze occurs
beside Cross-hatch line changes as follows;
Lens Change of chromatic aberration
Red Orange ¤AScarlet
Green Blue ¤ARed
Blue Purple ¤AGreen
Third Bar
CHROMATIC
ABERRATION
CROSS HATCH
SIGNAL
- 13 -
2. G-lens Adjustment
1) Rotate the lens until the chromatic haze changes from blue
to red.
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 aberrations bright line
isn't equal, adjust Green lens so that the red chromatic
aberration is appeared more than previous time.
3) Switching the signal to 13CH and operate adjustment
minutely.
4) Adjust Green focus control volume of focus pack so that the
external big circle's part appeared clearly.
5) Adjust accurately by repeat the upper control.
6) Especially, noting to the Green light because it influenced on
pictureÕs function.
3. R-lens adjustment
1) Rotate the RED lens until the chromatic haze changes from
orange to scarlet.
2) Adjust to appear Red chromatic aberration in right 3.5 cross-
hatch section at center screen.Adjust the chromatic
aberration so that it located center correctly.
3) Switching the signal to 13CH and adjust it as same method
of Green lens.
4) Adjust as same method of Green lens with Red focus control
volume of focus pack.
4. B- lens adjustment
1) Rotate the lens until the chromatic aberration of 3.5 Cross-
Hatch left from center point changes from Violet to Green.
Adjust the chromatic aberration to be center point between
violet and green.
2) Adjust as same as method of Green lens with Red focus
control volume of focus pack.
5. Focus checking
After adjustment Red,Green & Blue lens, remove lens cover
and receive Cross-Hatch pattern and check the overall focus. If
needed,repeat above.