Troubleshooting a White Display
If the display is white, the
A27
back light inverter is functioning properly.
Connect a VGA monitor to the analyzer.
n
If the image on the external monitor is normal, then suspect
A2,
AM,
or the
front panel cabling.
H
If the image on the external monitor is bad, suspect the A19 GSP or cable
W20
(CPU to motherboard).
Troubleshooting a Black Display
1. Remove the front panel with the exception of leaving cable
W17
(A2
to
motherboard) connected.
2. Press
1Preset)
while checking to see if there is a flash of light.
n
If the light does not flash, suspect the front panel cabling, the display lamp,
or the A27 inverter.
Troubleshooting a Display with Color Problems
2.
Run
display service test 74 as described in Chapter 10. Confirm that there
are four intensities for each color.
n
If the test passes, then continue.
n
If the test fails, then suspect the front panel cabling,
A2,
A19,
or
Al&
3. Connect a VGA monitor to the analyzer.
n
If the image on the external monitor has the same color problems, then
replace the A19
GSl?
w
If the image on the external monitor is acceptable, then there must be a
missing color bit. Suspect the front panel cabling,
A2,
A19,
or
AM.
6.12
Digital Control Troubleshooting
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