Compaq 1600XL Maintenance & Service Manual page 75

Model 1600T, 1600-XL140, 1600-XL141, 1600-XL142, 1600-XL143, 1600-XL144,
1600-XL146, 1600-XL147, 1600-XL150 XL156, XL157, XL255, XL256, XL257, and XL258
Problem
Screen is dim.
Screen is blank.
Display is blank and
the Suspend icon is
flashing.
Internal display is
blank and the screen
on an external monitor
displays information.
Internal display
flashes or has garbled
characters when
Notebook is connected
to external monitor.
The light tubes on the
edge of the display
panel do not light up
at all and the Power-
On Self-Test (POST)
completes when the
unit is powered up.**
P N M
RESARIO OTEBOOK AINTENANCE AND
Presario 1600XL Series
Solving Display Problems
Probable Cause
Brightness Control
(if available) is not set
properly.
Computer screen is in direct
light.
Screen save was initiated by
Power Management due to
lack of user activity.
Display has overheated.
System is in Suspend mode.
Display function was switched
to the external monitor.
Using 1024 x 768 or higher
resolution on external monitor
and toggling back to internal
display, which supports up to
800 x 600.
Improper backlight or display
cable connections
Defective inverter board.
Defective display cable.
Defective display panel.
Defective system board.
S G 1600XL S
ERVICE UIDE ERIES
Solution(s)
Adjust the Brightness of the
display by pressing Fn+F7 or
Fn+F8.
Tilt display or move computer.
Press any key or touch the
TouchPad.
If the Notebook is in direct
sunlight, move it and allow it to
cool off.
Press any key or touch the
TouchPad.
Press Fn+F3 to switch between
LCD or CRT.
Restart the Notebook.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the system board.
T
ROUBLESHOOTING
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