LG 42LA6204 User Manual page 36

To use the TV's speakers
❐
[Depending on model]
SMART ➾
Sound is output through the TV speaker.
To use External Speakers
❐
SMART ➾
(Optical/HDMI ARC)
[Available only for models with an optical or HDMI (ARC) port]
Sound is output through the speaker connected to the optical port.
✎ SimpLink is supported.
Settings ➙ SOUND
Settings ➙ SOUND
➙ Sound Out ➙
➙ Sound Out ➙
TV Speaker
External Speaker