Acer TravelMate 4050 Service Manual page 68

Peripheral-Related Symptoms
Symptom / Error
System configuration does not match the
installed devices.
External display does not work correctly.
USB does not work correctly
Print problems.
Keyboard/Touchpad-Related Symptoms
Symptom / Error
Keyboard (one or more keys) does not work.
Touchpad does not work.
Modem-Related Symptoms
Symptom / Error
Internal modem does not work correctly.
NOTE: If you cannot find a symptom or an error in this list and the problem remains, see "Undetermined
Problems" on page 62.
61
Action in Sequence
Enter BIOS Setup Utility to execute "Load Setup defaults", then
reboot system.
Reconnect hard disk/CD-ROM/diskette drives.
See if there is an error beep. If there is an erro beep, then change
main board.
Power off. Then check if RAM CPU BIOS are well-connected.
Press Fn+F5 three times slowly
LCD FPC
LCD inverter
LCD
USB device cable is firmly connected into the USB ports. Test one
USB port each time.
USB socket is firmly secured to the main board.
Main board
Ensure the "Parallel Port" in the "System Devices" of BIOS Setup
Utility is set to Enabled.
Onboard Devices Configuration
Run parallel port test
Printer driver
Printer cable
Printer
Main board
Action in Sequence
Reconnect the keyboard cable.
Keyboard
Main board
Reconnect touch pad cable. Modem port is secured to the main
board
Touch pad FPC
Audio/Touch pad board
Main board
Action in Sequence
Ensure the telephone cable is firmly plugged into the telephone wall
socket and the modem port of the computer.
Modem phone port is secured to the main board.
modem combo board
Main board
Chapter 4