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24 T
ROUBLESHOOTING
P
RESARIO
N
OTEBOOK
M
AINTENANCE
AND
S
ERVICE
G
UIDE
1800 S
ERIES
Presario 1800 Series
Models: XL180, XL181, XL182, XL183, XL184, XL185,
and XL190, XL191, XL192
**This problem indicates that 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 powering up 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 is blank and
the Standby 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
when the unit is
powered up.**
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 Power-On
Self-Test (POST) does
not complete when the
unit is powered up.**
Defective system board. Replace the system board
.
Display
Problem Probable Cause Solution(s)