LG 47LM9600 Owner's Manual page 199

Problem
On certain channels, sound
does not come out or only
the background music plays.
(If it is a program created for
overseas)
There is no sound when
On Language, set Language
desired language. Even if the language on
is changed, once the power is turned off or the channel
is changed, the default settings will be reset.
higher.
Solution
Audio Language as the
Multi Audio