Compaq 12XL500 Models XL300, XL300A, and XL300B - Maintenance & Service Gu - Page 64

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

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Presario 1200XL Series Model XL300, XL300A, and XL300B Problem 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. Solving Display Problems Probable Cause Solution(s) Defective system board. Replace the system board. Improper display cable connections. Defective inverter board. Defective display cable. Defective 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, listening for the single or double beep, and watching for the icons to turn on at the front of the Notebook. Solving Display Problems Continued Problem Probable Cause Solution(s) This display panel has a continuous pattern across it (e.g., "jailbars" pattern), has a single color on it, or has garbled graphics across the entire panel. This failure is for patterns across the entire panel (not just on one section). Improper display cable connections Reseat the display cable to the following until the problem is solved: 1. System board 2. Display assembly Defective display cable. Replace the display assembly. Defective inverter board. Replace the display assembly. PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1200XL SERIES TROUBLESHOOTING 27

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P
RESARIO
N
OTEBOOK
M
AINTENANCE
AND
S
ERVICE
G
UIDE
1200XL S
ERIES
T
ROUBLESHOOTING
27
Presario 1200XL Series
Model XL300, XL300A, and XL300B
*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.
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.
Solving Display Problems Continued
Problem
Probable Cause
Solution(s)
This display panel has
a continuous pattern
across it (e.g.,
²jailbars³ pattern), has
a single color on it, or
has garbled graphics
across the entire
panel. This failure is
for patterns across the
entire panel (not just
on one section).
Improper display cable
connections
Reseat the display cable to the
following until the problem is
solved:
1.
System board
2.
Display assembly
Defective display cable.
Replace the display assembly.
Defective inverter board.
Replace the display assembly.
Solving Display Problems
Problem
Probable Cause
Solution(s)