Solving Hard Drive Problems - Compaq 1230 Maintenance & Service Manual

"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
This display panel has a continuous pattern
across it (e.g., a "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).
Ghost bars extending from graphics on the
display.
A single line, small group of lines, or block
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.
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...RIO%201200%20SERIES%201230%201232/solving.html (6 of 8)6/27/2004 2:20:26 AM
Probable Cause
Improper display cable
connections
Defective display cable.
Defective inverter board.
Defective system board.
Common characteristic of
STN displays.
Defective display panel.
Solution(s)
Reseat the display cable to the
following until the problem is solved:
1. System board
2. Display assembly
Replace the display assembly.
Replace the display assembly.
Replace the system board.
1. Change the background colors.
2. Adjust the Contrast of the display
by using Fn + F5 (¯ ) or Fn + F6
(- ).
Replace the display assembly.