LG -P768 User Manual page 281

Message Possible causes
The screen
does not turn
Proximity sensor problem
on when I
receive a call.
No sound Vibration mode
Hang up or
Intermittent software problem
freeze
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 that 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, insert it again and switch on
the phone.
Try to perform a software update via the website.
137