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Presario 1600xl series – Compaq 1600XL User Manual

Page 76

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28 T

ROUBLESHOOTING

P

RESARIO

N

OTEBOOK

M

AINTENANCE

AND

S

ERVICE

G

UIDE

1600XL S

ERIES

Presario 1600XL Series

Model 1600T, 1600-XL140, 1600-XL141, 1600-XL142, 1600-XL143, 1600-XL144,

1600-XL146, 1600-XL147, 1600-XL150 XL156, XL157, XL255, XL256, XL257, and XL258

**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.

(Continued)

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.,

“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.

Solving Display Problems

Problem

Probable Cause

Solution(s)