Compaq Presario 1800 - Notebook PC Maintenance And Service Manual page 59

Models: XL180, XL181, XL182, XL183, XL184, XL185,
Problem
Screen is blank.
Display is blank and
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 no light up at
all and the Power-On
Self-Test (POST)
completes when the
unit is powered up.**
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.**
**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.
24 T
ROUBLESHOOTING
Presario 1800 Series
and XL190, XL191, XL192
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
1024x768 or higher resolution
and view is toggled back to
the Notebook display, which
supports up to 800x600.
Improper backlight or display
cable connections
Defective inverter board.
Defective display cable.
Defective display panel.
Defective system board.
Defective system board.
P
RESARIO
Solution(s)
If the Notebook is in direct
sunlight, move it and allow it to
cool off.
Press any key or touch the
TouchPad.
Use Fn+F3 to switch between
LCD or CRT.
Restart the Notebook.
1. Check the display cable
connections and retest.
2. Replace the display
Replace the display
Replace the display
Replace the display
Replace the system
Replace the system
N M S
OTEBOOK AINTENANCE AND
assembly.
assembly.
assembly.
assembly.
board.
board.
G 1800 S
ERVICE UIDE ERIES