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24 T
ROUBLESHOOTING
P
RESARIO
N
OTEBOOK
M
AINTENANCE
AND
S
ERVICE
G
UIDE
1800 S
ERIES
Presario 1800/1800T Series
Models: XL280, XL380, XL381,
and XL390
**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.
Display has overheated. Turn off the Notebook, and if
necessary move it out of direct
sunlight to allow it to cool.
Display is blank and
the Standby
é
icon is
flashing.
System is in Standby mode. Press any key or touch the
TouchPad.
Notebook display is
blank and the screen
on an external monitor
displays information.
Display function was switched
to the external monitor.
Press Fn+F3 to switch between
the external monitor and the
Notebook display (you may have
to press more than once).
Notebook display
flashes or has garbled
characters when
Notebook is connected
to 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.
Restart the Notebook.
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.**
Improper backlight or display
cable connections.
1. Check the display cable
connections and retest.
2. Replace the display assembly
.
Defective inverter board. Replace the display assembly
.
Defective display cable. Replace the display assembly.
Defective display panel. Replace the display assembly
.
Defective system board. Replace the system board.
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.**
Defective system board. Replace the system board
.
Display
Problem Probable Cause Solution(s)