Acer Aspire ONE 722, Service Manual, Page: 130 / 222

4-6 Troubleshooting
Bottom Display Issues
0
If the bottom display fails, perform the following:
Figure 4-3. No Display Issue (BOTTOM)
No POST or Video
0
If the POST or video does not appear, perform the following, one at a time.
1. Make sure that internal display is selected. Switching between internal and external by
pressing
Fn+F5
. Reference Product pages for specific model procedures.
2. Make sure the computer has power by checking for one of the following:

Fans start up

Status LEDs illuminate
If no power, Refer to
Power On Issues
.
3. Drain stored power by removing the power cable and battery. Hold the power button for 10
seconds.
4. Connect the power and reboot the computer.
5. Connect an external monitor to the computer and switch between the internal display and
the external display is by pressing
Fn+F5
.
6. If the POST or video appears on the external display only, refer to
LCD Failure
.
7. Disconnect power and all external devices including port replicators or docking stations.
Remove any memory cards and CD/DVD discs.
8. Start the computer. If the computer boots correctly, add the devices one by one until the
failure point is discovered.
9. Reseat the memory modules.
Start
OK
NG
OK
OK
NG
Lvds cable
Insert well
or it NG
Bottom
control/B cable
insert well or
NG
Replace M/B
Insert it well
Or change it
Insert is well or
Change control/B
or control/B cable