Compaq XL280 Maintenance & Service Manual page 59

Problem
Display is blank and
é
the Standby icon is
flashing.
Notebook display is
blank and the screen
on an external monitor
displays information.
Notebook 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 on
startup.**
The light tubes on the
edge of the display
panel do not light up at
all and the Power-On
Self-Test does not
complete on startup.**
**The backlight or its power circuitry has failed. If the backlight is not functioning, the POST
result cannot be observed. Connect the unit to an external monitor before restarting the
unit. If an external monitor is not available verify that POST is complete by opening and
closing the display, listening for the single or double beep, and watching for the icons to
turn on at the front of the Notebook.
Presario 1800/1800T Series
Models: XL280, XL380, XL381,
and XL390
Display
Probable Cause
Display has overheated.
System is in Standby mode.
Display function was switched
to the external monitor.
The external monitor is set for
1024 x 768 or higher
resolution and view is toggled
back to the Notebook 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.
Defective system board.
Solution(s)
Turn off the Notebook, and if
necessary move it out of direct
sunlight to allow it to cool.
Press any key or touch the
TouchPad.
Press Fn+F3 to switch between
the external monitor and the
Notebook display (you may have
to press more than once).
Restart the Notebook.
1. Check the display cable
connections and retest.
2. Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the system board.
Replace the system board.