HP M2350A Service Manual page 229

Troubleshooting the System
Troubleshooting the Display
Sympt-
(0 display
'oar display quality:
nverse video, faded
mage, ghosting.
Possible Cause
Corrective
Action
The video cable to the display is
Check the video connection and
disconnected
reconnect as necessary.
Video termination switch on rear of
Switch ON (in) if only a master display ir
display incorrectly set.
used, switch OFF (out) if a second
(slave) display is connected to the
master display.
Color display is connected to
Insert color display controller cards
monochrome controller (DSPC).
(CDSPC-CTRL and CDSPC-VIDEO).
Power lead or video cable disconnected
Check/replace leads as necessary,
or faulty.
Blue ML connector inside bezel Check/reconnect HIL connector.
improperly connected.
Jo control of the display
dghtness and contrast
?he picture is scrambled
Faulty CDSPC-VIDEO card (color only).
Replace card.
Faulty DSPC or CDSPC-CTRL card. Replace card.
The display controller is defective
If possible, check the Status Log and the
Error LED on the display controller. If
no entry on the Status Log and LED is
not on, switch the system off and on,
then check again. If there is an entry
for the display controller in the Status
Log or the LED is on, suspect the
display controller. Otherwise, suspect
the HIF board in the display bezel.
The Termination Switch is incorrectly set Check the lbrmination Switch and reset
as necessary.
The video cable from the back of the
Check the connection and reconnect as
Computer Module to the Display is not
necessary.
connected correctly
for Color Only)
The video cable is defective
The degaussing coils are defective
Replace the video cable and recheck.
Switch off the color display for 30
minutes and then switch on, If the fault
persists suspect the degaussing circuitry
and replace the display.
The display controller is defective
Check the Status Log and the Error LED
on the display controller. If no entry on
the Status Log and LED is not on,
reboot the system and check again. If
there is an entry for the display
controller in the Status Log or the LED
is on, replace the display controller and
recheck.
ncorrect colors displayed
The video cable is not connected
Check the video connection and
mwrly
reconnect as necessary.
The Color Display is connected to a Replace Monochrome Controller (DSPC)
Monochrome Controller in the Computer
with Color Display Controller cards:
Module.
CDSPC-CTRL and CDSPC-VIDEO.
The video cable is open circuit
Replace the video cable.
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