Compaq 1257 Fn + F8, connections, connections, with Fn + F7 or, Fn + F5 or Fn + F6, Defective system board, Improper display cable, Defective system board, LCD, CRT

Compaq.com - Compaq Presario 1200 Series Maintenance and Service Guide - Models: 1255, 1257, 1260, 1262, 1266, and 1267

Screen is blank.	Screen save was initiated by Power	Press any key or touch the Touch Pad.
	Management due to lack of user
	activity.

Display has overheated.

If computer is in direct sunlight, move it and allow it to cool off.

Display is blank and the Suspend icon is flashing.

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

System is in Suspend mode.Display function was switched to the external monitor.

Press any key or touch the Touch Pad.Use Fn + F3 to switch between LCD or CRT.

Problem

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

Probable Cause		Solution(s)

Using 1024 × 768 or higher		Restart the computer.
resolution on external
monitor and have toggled
back to internal display,
which supports up to
800 × 600.

The light tubes on the edge of the display panel do not light up at all and Power-On Self-Test (POST) completes when the unit is powered up.**

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.**

Improper backlight or display cable connections Defective inverter board. Defective display cable. Defective display panel. Defective system board.Defective system board.

Replace the display assembly.

Replace the display assembly.

Replace the display assembly. Replace the system board.Replace the system board.

Backlight (brightness) cannot be adjusted		Improper display cable
with Fn + F7 or		connections.
Fn + F8.***
		Defective inverter board.


		Defective display cable.


		Defective system board.




Contrast cannot be adjusted with		Improper display cable
Fn + F5 or Fn + F6.		connections.