Compaq 17XL260 - Presario - PIII 500 MHz Maintenance And Service Manual page 70

Models: XL260, XL261, XL262, XL264, XL265, XL266, XL274, XL275, XL360, XL361,
XL362, XL363, XL364, XL365, XL366, XL367, XL368, XL369, XL370, XL371, XL372, XL373,
Problem
Internal 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 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.**
Backlight (brightness)
cannot be adjusted
with Fn+F7 or Fn+F8.
**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, and listening for the single or double beep.
Presario 1700 Series
XL374, XL375, XL376, XL377, and XL378
Solving Display Problems (Continued)
Probable Cause
Using 1024 x 768 or higher
resolution on external
monitor, and have toggled
back to internal 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.
Improper display cable
connections.
Defective inverter board.
Defective display cable.
Defective system board.
Solution
Restart the Notebook.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the system board.
Replace the system board.
1. Reseat the display cable to the
system board.
2. Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the system board.