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The light tubes Display switch is stuck Remove keyboard cover and
on the edge of in the off position. inspect the display switch.
the display panel Replace the following one
light up at a time until switch has
momentarily when proper movement:
unit is powered 1. Display switch spring.
up, but turn off 2. Keyboard cover.
during or after
POST. Power LED
lights up on
front of unit but
not on top. ***
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The light tubes Defective system board. Replace the system board.
on the edge of
the display panel
do not light up
at all and
Power-On
Self-Test (POST)
does not complete
when the unit is
powered up. ***
===========================================================================
Problem Probable Cause Solution(s)
===========================================================================
Backlight Power Management Verify that you have not
(brightness) settings are set high, selected a Power Management
cannot be causing a dim display. setting that limits the
adjusted with the output of the backlight.
brightness
control slide.
*****
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Control slide is seated Remove the control slide
improperly. from the display bezel and
reseat it.
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Improper display cable 1. Reseat the display cable
connections. to the inverter board.
2. Reseat the display cable
to the system board.
-------------------------------------------------------
Defective inverter Replace the inverter board.
board. ****
-------------------------------------------------------
Defective display cable. Replace the display cable.
****
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Defective system board. Replace the system board.
****
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Contrast cannot Control slide improperly Remove the plastic control
be adjusted with seated. slide from the display bezel
the contrast and reseat it.
control slide
(color STN models
only). *
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