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7
.
TROUBLE SHOOTING
FLOW CHART
ViewSonic Corporation
14
Confidential
– Do Not Copy
YES
NO
ON
OFF
GREEN
Hsync,Vsync
Or DE error
ORANGE
OSD no respon
se
Too dim
The brightness is
different between upper
and
lower
side
of panel
Part
ical
picture without
c
olor
Vertical,Horizontal
Out of
sync
One or more
color
ed
v
ertical lines
Even(or odd) vertical
l
ine is dark
Does
picture
display
Back-light
On or off?
A dark picture
or a pi
c
ture
full of
color
ed
vertical lines
Check
power
LED
Check display
resoluton
Check inverter
Check I/F board
JP1
Check LED cable
Check I/F board JP4
Check LED panel J1
Check I/F board
Check SW board S1~S4
Check OSD adjustment
Check inverter
Check backlight
Check connector board
Check I/F board
Check LCD panel
Check LCD panel
Check I/F board
Check SW board J1
Check inverter
Check I/F board
RGB signal
error
H,V syn
c
error
VE
7
00-1
VA720-2