HP 18XL381 manual Replace the display assembly Replace the system board

Presario 1800/1800T Series

Models: XL280, XL380, XL381,

and XL390

	Display
Problem	Probable Cause	Solution(s)

	Display has overheated.
Display is blank and	System is in Standby mode.
the Standby é icon is
flashing.
Notebook display is	Display function was switched
blank and the screen	to the external monitor.
on an external monitor
displays information.
Notebook display	The external monitor is set for
flashes or has garbled	1024 x 768 or higher
characters when	resolution and view is toggled
Notebook is connected	back to the Notebook display,
to external monitor.	which supports up to
	800 x 600.
The light tubes on the	Improper backlight or display
edge of the display	cable connections.
panel do not light up at
all and the Power-On
Self-Test (POST)
completes on
startup.**
	Defective inverter board.
	Defective display cable.
	Defective display panel.
	Defective system board.
The light tubes on the	Defective system board.
edge of the display
panel do not light up at
all and the Power-On
Self-Test does not
complete on startup.**

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.

**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.

24 TROUBLESHOOTING PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1800 SERIES