LG Soundbar Optical Audio Not Working — Fix

What Does This Error Mean?

LG soundbar optical audio not working is usually caused by the wrong input selected, the TV digital audio output set to Off or Auto, or an optical cable not fully inserted. Select OPTICAL input and set TV digital audio to PCM.

How to Fix It

Select Optical input on the soundbar
Set TV digital audio output to PCM
Check the optical cable is fully inserted
Disable HDMI ARC if it is overriding the optical
Test with a replacement optical cable
Power cycle the soundbar

Frequently Asked Questions

LG soundbar OPT input selected but still no sound?

Confirm the TV digital audio output is PCM (not Off or Auto). Also check the cable is undamaged and both ends are fully inserted without the dust cap.

LG soundbar optical audio is out of sync with video?

LG TVs include an Audio Delay setting at Settings > Sound > AV Sync Adjustment. Increase the delay value until the audio matches the video.

Should I use HDMI ARC or Optical for my LG soundbar?

HDMI ARC is better — it supports higher audio quality formats and allows volume control via TV remote. Optical is limited to PCM stereo and Dolby Digital 5.1, with no remote volume control.