LG 42LM6410 User Manual page 171

Problem
TV sound is not in sync
with the image or the sound
breaks up occasionally.
The volume changes when I
change programme.
• If the issue affects a specific TV programme only, it
may be caused by problems with the broadcast signal
for the individual station. Check with the TV station or
your cable operator.
• Volume can vary from programmel to programme.
• Set Auto Volume
Solution
to On.