Ghost Adjustment; V.com (Flicker) Adjustment; Nash (Vertical Line) Adjustment - Hitachi 50V500 Service Manual

III. ASSEMBLED P.W.B. ADJUSTMENT

7.0 GHOST ADJUSTMENT

ADJUST ITEMS
1 ADJ.SIGNAL
2 GHOST
ADJUSTMENT
3 RED GHOST
ADJUSTMENT
4 GREEN GHOST
ADJUSTMENT
5 BLUE GHOST
ADJUSTMENT

8.0 V.COM (FLICKER) ADJUSTMENT

ADJUSTMENT ITEMS
0 PREPARATION
SIGNAL
1
Red FLICKER
2
ADJUSTMENT
GREEN FLICKER
3
ADJUSTMENT
4 BLUE FLICKER
ADJUSTMENT
9.0 NRSH (VERTICAL LINE) ADJUSTMENT
ADJUSTMENT
ITMS
0 PREPARATION Flicker adjustment should be finished.
SIGNAL
1
NRSH
2
ADJUSTMENT
BACK TO ADJUSTMENTS
Internal signal from IC(Black window pattern with 50% raster signal)
ADJUST MODE LCD ADJUST
First , reduce the "SHP" pressing left button
the window pattern.
Next, increase the "SHP" pressing right button
increase 3 steps.
Example
27
STRONG
GHOST
Watch carefully on the screen.
Check for no ghost on the window pattern. If there is, decrease the ghost by cursor left ( ) or
corsor right ( ) of the remote control.
Press "SELECT" key and adjust same procedure as RED GHOST.
Press "SELECT" key and adjust same procedure as GREEN GHOST.
This adjustment should be done after GHOST ADJUSTMENT.
Internal signal from IC ( 50% raster signal with one dot black lines)
SELECT : ADJUST MODE
You should reduce the flicker by pressing left or right button of handset.
The adjustment point is the weakest FLICKER position.
Press "SELECT" key, then the internal signal will be changed from red to green.
Same procedure should be done for GREEN flicker adjustment.
Press "SELECT" key, then the internal signal will be changed from green to
blue.Same procedure should be done for GREEN flicker adjustment.
ADJUSTMENT PROCEDURE
Internal signal from IC(Grey pattern)
SELECT :ADJUST MODE
The screen is divided in 9 areas. Initially, the upper left area is selected.
Check that no black or white vertical stripes are observed on the screen.
If 12 dots interval stripes exist, select area by using the cursor stick on
handset ( / direction) and adjust NRSH by using the stick ( / ).
ADJ. PROCEDURE
GHOST
of the remote until ghost appears at the left hand side of
of handset until ghost disappears. Then,
GHOST
28 29
WEAK GHOST DISAPPERAED
ADJUSTMENT PROCEDURE
LCD ADJUST V.COM with handset.
LCD ADJUST NRSH by using handset.
57
2A 2B 2C
+1 +2 +3
ADJUSTMENT
POINT
LC37/LC37F