Hitachi 42PMA400E, Service Manual

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5.2 Trouble Shooting of Panel Module from the point view of Fault Symptom
NO Fault
contents
Fault status Suspected fault
location
Analysis
procedure
and measure
1
After momentarily going
on, the screen becomes
black immediately or after
a few seconds. (Main
power is turned off.)
X-SUS
Y-SUS
Panel chassis
LOGIC
ABUSL
ABUSR
2
Entire
screen does
not light.
Screen lights dimly even
on the back screen.
LOGIC Replace LOGIC
board
3 Single vertical line (of
different color)
Panel chassis
LOGIC
4
Vertical line
Vertical line from the
middle of effective scan
area (Vertical line of
different color)
Panel chassis Replace panel
chassis
5
Bar width of 1/7 of
horizontal size or in
multiples of 1/7, is
displayed. Abnormal
display. Panel chassis
ABUSL
ABUSR
LOGIC
Above boards are
connected
.
6
Vertical bar
Bar width of 3/7 or 4/7 of
the screen width, is
displayed. Abnormal
display. (Vertical line of
different color)
ABUSL
ABUSR
LOGIC
Above boards are
connected
.
7 Horizontal
line
Single horizontal line (No
light) Or single horizontal
line does not light among
the effective scanning
area.
Single horizontal line
does not light.
Panel chassis Replace panel
chassis
8 Horizontal
bar
Bar width of 1/8 or
multiples of 1/8 of the
screen height, is
displayed.
Abnormal (Screen does
not light)
Panel chassis Replace panel
chassis
9
Bar width of 1/2 of the
screen height.
Abnormal display
(Screen does not light)
Panel chassis
Y-SUS
X-SUS
Above boards are
connected.
7