LG P970 User Manual page 239

Troubleshooting
Message Possible causes
The screen
does not
come on Proximity sensor problem
when I
receive a call.
No sound Vibration mode
Hang up or
Intermittent software problem
freeze
74
Possible corrective measures
If you use any protection tape or case,
check to see if it has covered the area
around the proximity sensor. Make sure
the area around the proximity sensor is
clean.
Check the settings status of the sound
menu to make sure you are not in vibrate
or silent mode.
Remove the battery, reinsert it and switch
on the phone.
Try to perform a software update via the
website.