Compaq Presario 17XL Presario NA1700XL Series Maintenance and Service Guide - Page 70

Solving Display Problems, Problem, Probable Cause, Solution, with Fn+F7 or Fn+F8.

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Presario 1700 Series Models: XL260, XL261, XL262, XL264, XL265, XL266, XL274, XL275, XL360, XL361, XL362, XL363, XL364, XL365, XL366, XL367, XL368, XL369, XL370, XL371, XL372, XL373, XL374, XL375, XL376, XL377, and XL378 Solving Display Problems (Continued) 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 SelfTest (POST) does not complete when the unit is powered up.** Backlight (brightness) cannot be adjusted with Fn+F7 or Fn+F8. 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. **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.

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