"Compaq.com - Compaq Presario 1200 Series Maintenance and Service Guide - Models: 1230 and 1232

**This problem indicates that the backlight or its power circuitry has failed. Since you cannot observe the POST result on the display panel when the backlight is not functioning, connect the unit to an external monitor before powering the unit up. If an external monitor is not available, verify that POST completes by opening and closing the display, listening for the single or double beep, and watching for the LEDs turn on at the front of the computer.

Problem

 

Probable Cause

 

Solution(s)

 

 

 

 

 

 

 

 

 

 

This display panel has a continuous pattern

 

Improper display cable

 

Reseat the display cable to the

across it (e.g., a "jailbars" pattern), has a

 

connections

 

following until the problem is solved:

single color on it, or has garbled graphics

 

 

 

 

 

across the entire panel. This failure is for

 

 

 

1.

System board

patterns across the entire panel (not just

 

 

 

 

 

on one section).

 

 

 

2.

Display assembly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective display cable.

 

Replace the display assembly.

 

 

 

 

 

 

 

 

 

 

 

 

Defective inverter board.

 

Replace the display assembly.

 

 

 

 

 

 

 

 

 

 

 

 

Defective system board.

 

Replace the system board.

 

 

 

 

 

 

 

 

 

 

 

Ghost bars extending from graphics on the

 

Common characteristic of

 

1.

Change the background colors.

display.

 

STN displays.

 

 

 

 

 

 

 

2.

Adjust the Contrast of the display

 

 

 

 

by using Fn + F5 (¯ ) or Fn + F6

 

 

 

 

(- ).

 

 

 

 

 

 

A single line, small group of lines, or block

 

Defective display panel.

 

Replace the display assembly.

appears on the display panel. This failure

 

 

 

 

occurs in only a section of the display panel.

 

 

 

 

 

 

 

 

 

To perform a "self-test" on an external VGA color or monochrome monitor, complete the following steps: NOTE: The screen should be white. A narrow black border may also appear on the left and right sides of the

display. Either of these displays indicates that the monitor is working properly.

Solving Hard Drive Problems

Some common causes and solutions for hard drive problems are listed in the following table.

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