Fix No Sound After Setup – Avantree Support

No sound usually means the headphones are not connected, the wrong output is selected, or the TV audio format is not supported.

Quick Check

1️⃣ Check Transmitter Signal & TV Audio

● Solid light → TV audio detected

● Flashing light → No audio from TV

Quick fix: Re-check the TV audio output and cable connections, then set TV Audio Settings → Digital Audio Output → PCM. Learn Here:

2️⃣ Check Headphone Connection

● Solid blue → Connected to transmitter

● Flashing blue → Not connected

Quick fix: Pair the headphones with the transmitter. Learn Here

3️⃣ Match the Input Mode

Set the transmitter input to match your TV: AUX | Optical | HDMI ARC.

If Receiver Has Two Modes make sure it is set to the correct mode:

● Opera Plus / Crescendo 3D / Crescendo Me → TV/Base Mode

● Harmony 2 → Broadcasting Mode

4️⃣ No sound from a specific app

If sound works elsewhere but not in apps like Netflix or Prime Video: Set the TV app setting or Streaming Device setting to PCM/Stereo

5️⃣ Reconnect the Audio Cable
Unplug the audio cable from both the TV and the transmitter, then plug it back in securely.
This helps reset the audio signal and resolve loose or unstable connections.

Most Common Reason

The TV is set to an unsupported audio format (Dolby/DTS instead of PCM) or the headphones are not properly connected.

💡 Tip:

After TV updates, audio settings may change automatically. If sound stops working suddenly, recheck that PCM is selected.

Still not working?

● LED behavior (color and flashing pattern)

● Your TV model

● How everything is connected (Optical, AUX, HDMI ARC)