Other Functions Failure; Bios Problems - Acer Aspire S5-391 Service Manual

Other Functions Failure

If other functions such as the thunderbolt switch or HDMI switch, perform the following:
Check if the drive is ok.
1.
Check if the test fixture is ok.
2.
Swap the mainboard.
3.

BIOS Problems

Forget BIOS Password
If there is a wrong CMOS setting or the user forgets the BIOS password, discharge CMOS by
shorting the R568 connector.
Refer to Clearing the Password Check and BIOS Password
Random Loss of BIOS Settings
If the computer is experiencing intermittent loss of BIOS information, perform the following:
If the computer is more than one year old, replace the CMOS battery.
1.
Run a complete virus scan using up to date software to confirm the computer is virus free.
2.
If the computer is experiencing HDD information loss, disconnect and reconnect the power.
3.
Troubleshooting
Figure 4-37. Discharge MB CMOS
on page 2-22.
4-28