"Compaq.com - Compaq Presario Series Maintenance and Service Guide - Models : 1270, 1670, and 1675

Screen is blank.

 

Screen save was initiated by Power

 

 

Management due to lack of user

 

 

activity.

 

 

 

Press any key or touch the Touch Pad.
Display is blank and the Suspend icon is flashing.

Internal display is blank and the screen on an external monitor displays information.

Display has overheated. System is in Suspend mode.Display function was switched to the external monitor.
If computer is in direct sunlight, move it and allow it to cool off.

Press any key or touch the Touch Pad.

Use Fn + F2 to switch between LCD or CRT.

Problem

 

Probable Cause

 

Solution(s)

 

 

 

 

 

Internal display flashes or has garbled characters when computer is connected to external monitor.

Using 1024 × 768 or higher Restart the computer. resolution on externalmonitor and have toggled back to internal display, which supports up to 800 × 600.
The light tubes on the edge of the display

 

Improper backlight or

 

Replace the display assembly.
panel do not light up at all and Power-On

 

display cable connections

 

 

Self-Test (POST) completes when the unit is

 

 

 

 

powered up.**

 

 

 

 

 

 

 

 

 

 

 

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

 

Defective system board.

 

Replace the system board.

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

 

Improper display cable

 

1. Reseat the display cable to the
with Fn + F7 (¯ ) or

 

connections.

 

system board.
Fn + F8 (- ).***

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

Contrast cannot be adjusted with

 

Improper display cable

 

1. Reseat the display cable to the

Fn + F5 (¯ ) or Fn + F6 (- ).

 

connections.

 

system board.

 

 

 

 

2. Replace the display assembly.

 

 

 

 

 

Defective inverter board.

Defective display cable. Defective system board.

Replace the display assembly.

Replace the display assembly. Replace the system board.

file:///C/SERVICE%20MANUALS/COMPAQ%20_%20check...SARIO%201270,%201670,%20and%201675/solving.html (5 of 8)6/27/2004 2:46:23 AM