Harmony No Sound Fix – Avantree Support

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Harmony – How to Fix No Sound

Follow these steps if your Harmony speakers are connected but you cannot hear TV sound.

Do not reset or re-pair the speakers yet. If the speakers are already connected, check the TV audio connection first.

Step 1 – Check the Speaker Connection

Turn ON the Harmony transmitter and speakers. Solid indicators = Connected. If a speaker is still flashing, fix the speaker connection first.

Step 2 – Check the Audio Cable

Make sure the cable is connected to Harmony – INPUT FROM TV.

Using Optical: TV OPTICAL / DIGITAL AUDIO OUT → Harmony OPTICAL INPUT. Set Harmony to OPT.

Using AUX: TV HEADPHONE / AUDIO OUT → Harmony AUX INPUT. Set Harmony to AUX.

Using RCA: Use the TV’s AUDIO OUT ports. Do not use an AUDIO IN port.

Step 3 – Using Optical? Set the TV to PCM

Open your TV’s Settings → Sound / Audio.

Sound Output: Optical / Digital Audio Out
Digital Audio Format: PCM / Stereo

If there is no sound with Auto, Dolby, DTS, or Bitstream, change the format to PCM.

Find Your TV PCM Setting

Step 4 – Using AUX or RCA?

Play something on the TV and turn up the TV volume. Then turn up the Harmony speaker volume.

Still no sound? Connect wired headphones or another speaker to the same TV audio port. If the wired device has sound, reconnect Harmony and make sure the transmitter is set to AUX.

Step 5 – Restart the System

Turn OFF the TV.
Turn OFF the Harmony transmitter and speakers.
Wait about 10 seconds.
Turn the TV back ON.
Turn ON the transmitter and speakers.
Wait for the speakers to reconnect, then play TV audio again.

Something Doesn’t Look Right?

Netflix or Prime Video Has No Sound

Start playing the movie or show.
Open the TV’s audio settings.
Set Digital Audio Format to PCM / Stereo.

If you use a Roku, Fire TV, Apple TV, or cable box, set its audio format to PCM / Stereo when available.

View Streaming Device Settings

Speakers Show Connected but Still No Sound

Check that the cable is connected to INPUT FROM TV.
Confirm Harmony is set to the correct OPT or AUX input.
If using Optical, set the TV to PCM / Stereo.
Turn up the speaker volume.

Only One Speaker Has No Sound

Make sure the affected speaker shows connected, turn up its volume, then turn that speaker OFF and back ON. Wait for it to reconnect. You do not need to change TV settings if the other speakers are playing normally.

All Speakers Have No Sound

Check the TV-to-transmitter connection first. For Optical, make sure the TV sends PCM / Stereo. For AUX or RCA, make sure you are using a TV Audio OUT port and the TV volume is turned up.

Need More Harmony Help?

See all setup and troubleshooting guides for this product.

View Harmony Support

Still No Sound?

Contact Avantree Support and include your TV brand and model, whether you use Optical, AUX, or RCA, whether one or all speakers have no sound, and what the indicator lights show.

Contact Avantree Support