Compaq LTE Elite Maintenance And Service Manual page 63

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