Soundbar No Sound Through Optical Cable: UK Troubleshooting Checklist

Direct answer: most failures are input, PCM/format mismatch, or loose fibre

When optical audio fails, start with three checks before assuming a hardware fault: confirm the TV is set to the optical/external-speaker path, switch digital audio out from Auto or Dolby-style options to PCM if needed, and reseat both ends of the fibre cable firmly. Guides covering optical no-sound causes list wrong format, a loose cable, HDMI ARC overriding optical, and the wrong input as common culprits.

Physical checks

Work through the cable and ports first:

• Power off the TV and soundbar, then unplug and firmly reinsert the optical cable at both ends until it clicks or seats fully.
• Confirm you are on the soundbar’s optical input (not AUX, USB or Bluetooth) if your model offers multiple sources.
• If the TV also has HDMI ARC/eARC active, temporarily disable ARC or audio return so optical is not overridden.
• Try a known-good optical lead if you have one, in case the fibre is kinked or the tips are dirty.

Manufacturer FAQs often stress firm insertion because a half-seated plug can look connected while carrying no audio.

Try PCM when Auto/Dolby fails

Many TVs default digital audio out to Auto or a surround bitstream. If the soundbar only accepts a stereo PCM stream over optical, you will get silence. Open the TV’s sound or digital-audio menu and set optical/digital out to PCM or PCM-Stereo, then test again with a familiar programme or app.

UK brand support articles for optical no-sound cases routinely recommend enabling optical output and switching digital out to PCM when Auto or Dolby options fail.

External speakers setting

Even with a solid cable and PCM selected, the TV may still mute the optical path if speakers are set to internal only. Find the audio output or speaker menu and choose external speakers, audio system, or optical out (wording varies by brand). After changing the setting, raise the soundbar volume and confirm the mute light is off.

AUX fallback

If optical remains silent after the checks above, use a wired fallback to separate cable issues from menu settings. Compact soundbars that list Optical and AUX can often take a 3.5 mm AUX lead from the TV’s headphone or audio-out jack. Connect AUX, select the AUX input on the soundbar, and test. If AUX works but optical does not, keep focusing on TV digital-out format, external-speaker mode and the optical lead rather than the bar itself.

Soft CTA

If you are setting up a compact Barvix soundbar with Optical and AUX inputs, the product page covers connectivity options, remote and app control, and the included Optical or 3.5 mm AUX setup path. Review the Barvix Compact 132W soundbar details when you need the connection list and form factor in one place.

FAQ

Why is there still no audio after I switch to PCM?

Recheck that the TV speakers mode is set to external or optical, that the soundbar input matches the cable in use, and that HDMI ARC is not taking priority over optical.

Can a loose optical cable cause intermittent or total silence?

Yes. Fibre plugs need a firm seat at both ends; a loose or dirty connection is a frequently listed cause of no sound through an optical cable.

Should I expect optical to fix every silent-soundbar case?

No. This checklist addresses the most common setup and format issues. If PCM, external speakers, a firmly seated cable and an AUX fallback all fail, contact the TV or soundbar maker’s support with your exact models rather than assuming a guaranteed fix.