LG 55LN575V User Manual page 56

To❐synchronize❐audio❐and❐video
❐ ❐
SMART❐ ❐➾❐Settings❐➙❐SOUND❐➙❐AV❐Sync.❐Adjust
Synchronizes video and audio directly when they do not match.
If you set AV Sync. Adjust
speakers or SPDIF) to the screen image.
TV Speaker
to ON,
Adjusts the synchronization of the sound from the TV's internal
speakers.
The "-" button makes the sound output faster and the "+"
button slower than the default value.
you can adjust the sound output (TV