Acer 2400 User Manual

Chapter 4

67

LCD backlight doesn't work

First, plug a monitor to CRT port. Next, enter BIOS utility to running 
“Load Default Settings” then reboot the system.
Reconnect the LCD connectors.
Keyboard (if the brightness function key doesn't work).
LCD cable
LCD inverter
LCD
Main board

LCD is too dark
LCD brightness cannot be adjusted

Enter BIOS Utility to execute “Load Setup Default Settings”, then 
reboot system.
Reconnect the LCD connectors.
Keyboard (if the brightness function key doesn't work).
LCD cable
LCD inverter
LCD
Main board

Unreadable LCD screen 
Missing pels in characters
Abnormal screen 
Wrong color displayed
LCD has extra horizontal or vertical lines 
displayed.

Reconnect the LCD cable
LCD cable
LCD
Main board

Indicator incorrectly remains off or on, but system 
runs correctly

Main board

HDD/CD-ROM active indicators cannot work

HDD/CD-ROM drive
Device driver
Main board

Power shuts down during operation

Power source (battery pack and power adapter). See “Power 
System Check” on page 59. 
Battery pack
AC adapter
See if the thermal module is overheat (Heat sink or fan).
Main board

The system cannot power-on.

Power source (battery pack and power adapter). See “Power 
System Check” on page 59.
Battery pack
Power adapter
CPU
Main board

The system cannot power-off.

In Windows XP operating system, hold and press the power switch 
for more than 4 seconds. If the system can power off, then the main 
board is OK. Verify OS in the HDD. 
Main board