TC417 - Fix No Sound – Avantree Support

No sound from TC417? Find the section for your connection mode below and follow the 3 troubleshooting steps. Both TX and RX instructions are displayed.

TX – Transmitter TV or audio source sends sound to Bluetooth headphones or speakers. Jump to TX Steps → RX – Receiver Phone, tablet, or computer sends Bluetooth audio to wired speakers or a stereo system. Jump to RX Steps →

TX Mode – No Sound TV / Audio Source → TC417 → Bluetooth Headphones

Check the Bluetooth Headphone Connection

A flashing pairing LED means your headphones are not connected and may still be connected to another device, such as your phone.

Set TC417 to TX mode and check its LED indicator.

Solid Green

Headphones connected. Continue to Step 2.

Flashing Red / Green

Not connected. Follow the pairing steps below.

Older TC417 units: Units before batch 23F1 may flash green only during pairing.

If Your Headphones Are Not Connected

Turn Bluetooth OFF on nearby phones or computers previously connected to your headphones.
Make sure TC417 is set to TX.
Press and hold the PAIR button for 2 seconds to enter pairing mode.
Put your headphones into Bluetooth pairing mode.
Keep both devices close together and wait until the LED turns SOLID GREEN.

TC417 Headphone Pairing Guide

Check the TV Audio Connection and Settings

If you're using an Optical connection, there may be no sound because your TV's Digital Audio Output is not set to PCM. Change it to PCM / Stereo PCM.

Optical (OPT)

Connect TV OPTICAL OUT to TC417 SPDIF IN.

Set the TV's Digital Audio Output to PCM / Stereo PCM.

Find PCM Settings for Your TV

Using a streaming device or cable box? Set its audio output to PCM or Stereo when available.

Streaming Device / Cable Box Audio Guide

AUX / 3.5 mm

Connect TV Headphone / Audio OUT to TC417 AUX.

Select headphone output on the TV if needed, and increase its volume.

RCA (Red / White)

Connect TV red and white AUDIO OUT to TC417's AUX connection using the appropriate RCA-to-3.5mm cable.

Do not use TV ports labeled AUDIO IN.

Check the Volume and Audio Cable

Low volume or a faulty audio cable can prevent sound even when the Bluetooth connection is working.

Play a TV program with sound.
Increase your Bluetooth headphone volume.
If using AUX, increase the TV's headphone output volume.
Firmly reconnect both ends of the audio cable.
Confirm TC417 remains in TX mode with a solid green LED.

Still no sound? Try another or a NEW compatible audio cable. A damaged Optical, AUX, or RCA cable can prevent sound even when your headphones are connected.

Still Need Help?

Tell us your TV and headphone models, audio connection type, and TC417 LED status. Mention that you're using TX mode.

ASK A QUESTION

← Back to Mode Selection

RX Mode – No Sound Phone / Tablet / Computer → TC417 → Wired Speakers

Check the Bluetooth Source Connection

A flashing blue or red/blue LED means TC417 is not connected to your phone, tablet, or computer.

Set TC417 to RX (Receiver) mode and check its LED indicator.

Solid Blue

Bluetooth source connected. Continue to Step 2.

Flashing Red / Blue

Pairing mode is active. Follow the instructions below.

If Your Phone or Computer Is Not Connected

Make sure the TC417 switch is set to RX.
Press and hold the PAIR button for 2 seconds. The LED should flash red and blue.
Open Bluetooth Settings on your phone, tablet, or computer.
Select Avantree TC417 from the available Bluetooth devices.
Wait until the TC417 LED becomes SOLID BLUE.

Official TC417 RX Mode Setup Guide

Already paired but not connecting? In your phone's Bluetooth settings, forget Avantree TC417, then put TC417 into pairing mode and connect again.

Check the Wired Speaker Connection

TC417 receives Bluetooth audio and sends it through a wired output. Your speaker or sound system must be connected to the correct output port and input setting.

AUX / 3.5 mm

Connect TC417's AUX port to your speaker's AUX IN / LINE IN.

Turn on the speaker and select AUX / LINE IN as its audio source.

Optical (SPDIF)

Connect TC417's SPDIF OUT to the speaker or soundbar's OPTICAL IN / SPDIF IN.

Select Optical on your speaker or soundbar.

RCA (Red / White)

If your stereo has red and white RCA inputs, use a compatible 3.5mm-to-RCA cable from TC417's AUX port to the stereo's AUDIO IN.

Select the matching input on your stereo.

Important: In RX mode, Optical must connect from TC417 SPDIF OUT to the speaker's OPTICAL IN. Do not connect your speaker to TC417's SPDIF IN port.

Check the Volume and Test the Sound

Even when TC417 shows solid blue, low volume, an incorrect speaker input, or a faulty cable may prevent sound.

Play music or a video on your phone, tablet, or computer.
Increase the media volume on your Bluetooth source.
Increase the volume on your wired speaker or stereo system.
Confirm that your speaker is set to the correct AUX / LINE IN / OPTICAL input.
Disconnect and firmly reconnect both ends of the audio cable.

Still no sound? Try another or a NEW compatible audio cable. A damaged AUX, Optical, or RCA cable can prevent audio from reaching your wired speaker even when TC417 is connected to your phone.

Still Need Help?

Tell us your phone or computer model, wired speaker model, audio cable type, and TC417 LED status. Mention that you're using RX mode.

ASK A QUESTION

← Back to Mode Selection