Compaq Contura 400 Maintenance And Service Manual page 281

light up at all and
Power-On-Self-Test
(POST) does not
complete when the
unit is powered
up. ****
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** When using an external monitor and simultaneously displaying an image
on the internal display, the image on the external monitor may not
fill the screen.
**** Blocks usually appear in an even fraction of the display (1/2, 1/4/,
1/6, 1/8, etc.)
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Problem
---------------------------------------------------------------------------
Backlight
(brightness) cannot
be adjusted with
brightness control
pop-up Fn + F9
keys. *
---------------------------------------------------------------------------
Contrast cannot be
adjusted with the
Fn + F8 keys. *
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The display panel has
a continuous pattern
across it (e.g., a
Probable Cause
Power conservation
mode settings are
set high, causing
a dim display.
---------------------------------------------------
Improper display
cable connections.
---------------------------------------------------
Defective inverter
board.
---------------------------------------------------
Defective display
cable.
---------------------------------------------------
Defective system
board.
Improper display
cable connections.
---------------------------------------------------
Defective inverter
board.
---------------------------------------------------
Defective display
cable.
---------------------------------------------------
Defective display
panel.
Improper display
cable connections.
Solution(s)
Verify that you are not in
a power conservation mode
that limits the output of
the backlight.
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.
***
Reseat the display cable
to the following one at a
time until the problem is
solved:
a. Inverter board.
b. System board.
c. Display panel.
Replace the inverter board.
***
Replace the display cable.
***
Replace the display panel.
***
Reseat the display cable to
the following until the
problem is solved: