Hitachi 50VS69A, Service Manual

Page: 43 / 122

2-
3 RASTER POSITION ADJUSTMENT
(1) Receive
a static and symmetric image (
Circle pattern signal
)
.
(2) Recall Adjustment menu.
(3) Select ‘V POSITION’ by using the cursor stick ( ▲ / ▼ direction)
on handset. Adjust the vertical
picture position where |E-F| <= 3mm
by using the cursor stick ( direction).
(4) Select ‘H POSITION’ by using the cursor stick ( ▲ / ▼ direction)
on handset. Adjust the horizontal
picture position where |G-H| <= 3mm
by using the cursor stick ( direction).
E
F
G H
Final ASSEMBLY ADJUSTMENT
◄ / ►
◄ / ►
NOTE : Refer to page 48 for display area spec.
2-
4 FLICKER ADJUSTMEN T
ADJUSTMENT PROCEDURE
(
1
)
SIGNAL
:
Internal signal from IC (50% raster signal with one dot
(
2
)
Red FLICKER
ADJUSTMENT:
black lines)
LCD ADJUST MODE → V.COM .
LCD ADJUST MODE
VCOM R xx
VCOM G xx
VCOM B xx
Press SELECT key, test pattern will be displayed.
Reduce the flicker by pressing cursor stick
◄► of handset.
The adjustment point is the weakest FLICKER position
.
(
3
)
GREEN
FLICKER ADJUSTMENT:
same procedure as red flicker.
Press SELECT key to return
to the “LCD ADJUST MODE”.
Select VCOM G and adjust by
(
4
)
BLUE
FLICKER ADJUSTMENT:
to the “LCD ADJUST MODE”. Select VCOM B and adjust by
Press SELECT key to return
same procedure as red flicker
Graphic representation of adjustment:
ADJ.value
F
LI
C
K
E
R
LE
VE
L
Adjustment point
A
djustment range
2-
5 GHOST ADJUSTMENT
ADJ
USTMENT
PROCEDURE
(
1
)
ADJ.SIGNAL Internal signal from IC (Black window pattern
with RGB raster signal)
ADJUSTMENT
(2) RED GHOST
LCD ADJUST MODE → GHOST
LCD ADJUST MODE
GHOST R xx
GHOST G xx
GHOST B xx
Press SELECT key, test pattern will be displayed.
(
3
) Increase the I
2
C data by pressing cursor stick ► of handset
until
ghost appears at left side of the window pattern.
(
4
) Then, decrease the I
2
C data by pressing cursor stick ◄ of
handset
until ghost disappears.
(
5
) Finally, decrease the I
2
C data by 3 steps
.
Example
(6)
GREEN GHOST
Press SELECT key to return to the “LCD ADJUST MODE”.
ADJUSTMENT
Select GHOST G and adjust same procedure as red GHOST.
(7)
BLUE GHOST
Press SELECT key to return to the “LCD ADJUST MODE”.
ADJUSTMENT
Select GHOST B and adjust same procedure as red GHOST
GHOST
ADJUSTMENT POINT
(1)
Ghost
disappears
(3)
(2)
GHOST data
Ghost
appears
10 11 12 13 14
-3 step -2 step -1 step
2-
6 NRSH ADJUSTMENT
ADJUSTMENT PROCEDURE
(1)
Complete FLICKER ADJUSTMENT before the adjustment.
(2)
SIGNAL Internal signal from IC (Gray scale)
(3) Red NRSH ADJUSTMENT
LCD ADJUST MODE → NRSH
LCD ADJUST MODE
NRSH HR xx
NRSH HG xx
Press SELECT key, test pattern will be displayed.
Reduce the vertical lines (12 dot width) by pressing the cursor
stick ◄► of handset.
Press SELECT key to return to the “LCD ADJUST MODE”.
re-adjust flicker.
(4) GREEN NRSH ADJUSTMENT
Press “ ▼ ” of handset. The test pattern
will be changed from red to
green.
Adjust the Green NRSH with same procedure as Red NRSH.
The Blue NRSH adjustment is not required.
(5)
CHECK FLICKER Check that picture is not flickering. If there is,
BACK TO ADJUSTMENTS
4
2
LC67