Acer Iconia Tab A700 - Advanced settings; Wireless & Networks; Adjusting Bluetooth settings

4-11 Troubleshooting
LED / Vibrator / HW-Keys / L-Sensor Test Failure
If the LED / vibrator / hardware keys / L-sensor test fails, perform the following:
Figure 4:9. LED / Vibrator / HW-Keys / L-Sensor Test Failure
Start
Check Function/B
OK
swap Function/B
NG
Swap M/B
Check Function/B
To M/B FFC
OK
OK
Swap the FFC
NG