Oasis Plus - Fix No Sound – Avantree Support

No sound from your Oasis Plus (TC500P) is usually caused by headphones that are not connected, an incorrect OPT/AUX input, or TV audio settings that prevent sound from reaching the transmitter. Follow these 3 steps in order.

Check the Bluetooth Headphone Connection

Turn on Oasis Plus and your Bluetooth headphones. Make sure the Oasis Plus mode switch is set to TX (Transmitter).

Look at the TX and A connection indicators.

TX + A: Solid White

Your Bluetooth headphones are connected. Continue to Step 2.

TX: Flashing Green / White

Oasis Plus is in Bluetooth pairing mode. Connect your headphones.

Headphones Not Connected? Pair Them Again

Move the Oasis Plus mode switch to TX.
Temporarily turn off Bluetooth on nearby phones, tablets, or computers that your headphones may reconnect to.
Put your headphones into Bluetooth pairing mode.
Press and hold the Oasis Plus Bluetooth Pairing button until the TX indicator flashes green and white alternately.
Keep both devices close together.
Wait approximately 5–10 seconds for the connection.
Confirm that the TX and A indicators are both solid white.

Important: Simply turning on your headphones does not always activate pairing mode. Follow the pairing instructions for your specific headphone model.

Detailed Oasis Plus Pairing Guide →

My TV Keeps Asking to Pair with the Headphones

Your headphones should connect directly to Oasis Plus, not to the TV's built-in Bluetooth.

If the TV displays a Bluetooth pairing request, select Deny or Cancel.
Put the headphones back into Bluetooth pairing mode.
Put Oasis Plus into pairing mode.
Wait until the TX and A indicators become solid white.

Expected: Both the TX and A indicators are solid white.

Check the TV Audio Input (OPT / AUX)

Oasis Plus must receive audio through the input that matches your TV cable.

Check the cable connecting your TV to Oasis Plus.
Press the AUX / OPT button on Oasis Plus to select the correct input.
Confirm the corresponding OPT or AUX indicator is selected.
Play a TV program with sound.

OPT — Optical Cable

Select OPT when the TV is connected with a digital Optical / TOSLINK cable.

AUX — 3.5 mm / RCA Cable

Select AUX when using the TV's headphone output or RCA AUDIO OUT.

I'm Using an Optical Cable

TV — OPTICAL / DIGITAL AUDIO OUT ↓ Optical Cable ↓ Oasis Plus — OPTICAL TX INPUT FROM TV

Connect the cable to the TV's OPTICAL OUT.
Connect the other end to the Oasis Plus OPTICAL port under TX INPUT FROM TV.
Remove the protective caps from both ends of the Optical cable, if they are still attached.
Press the AUX / OPT button to select OPT.
Open your TV's Sound / Audio Settings.
Select Optical / Digital Audio Out as the audio output if required.
Set the digital audio format to PCM or Stereo PCM.
Play audio again.

Important: Oasis Plus does not support Dolby or DTS audio through its Optical input. Set the TV to PCM rather than Dolby, DTS, or Bitstream.

Find PCM Settings for Your TV Brand →

I'm Using a 3.5 mm AUX Cable

TV — HEADPHONE / AUDIO OUT ↓ 3.5 mm AUX Cable ↓ Oasis Plus — AUX TX INPUT FROM TV

Connect the cable to your TV's Headphone / Audio OUT.
Connect the other end to Oasis Plus's AUX port under TX INPUT FROM TV.
Select AUX using the AUX / OPT button.
Select the TV's headphone output, if required.
Increase the TV's headphone output volume.
Play audio again.

Tip: Some TVs have a separate headphone volume setting. The TV speaker volume may not control the headphone output.

I'm Using Red and White RCA Audio

TV — RED / WHITE RCA AUDIO OUT ↓ RCA-to-3.5 mm Audio Cable ↓ Oasis Plus — AUX TX INPUT FROM TV

Locate the TV's red and white ports labeled AUDIO OUT.
Connect the RCA plugs to the matching audio output ports.
Connect the 3.5 mm end to Oasis Plus's AUX input under TX INPUT FROM TV.
Select AUX on Oasis Plus.
Play TV audio again.

Important: Red and white ports labeled AUDIO IN cannot send audio to Oasis Plus. Use AUDIO OUT only.

No Sound Only on Netflix or Streaming Apps?

Some streaming apps and external streaming devices use a different audio format from regular TV channels.

Start playing the affected video.
Open the TV or streaming device's sound settings.
If using Optical, set the digital audio output format to PCM / Stereo.
Restart the video and test again.

Expected: Oasis Plus is in TX mode, the selected OPT / AUX input matches your cable, and the TV is sending compatible audio.

Check the Volume, Cable, and Audio Output

Make sure the TV is playing audio and is not muted.
Increase the volume on your Bluetooth headphones.
Use Oasis Plus's Volume + button if additional volume is needed.
If using AUX, increase the TV's headphone output volume.
Disconnect and firmly reconnect both ends of the audio cable.
Confirm the cable is connected to TX INPUT FROM TV, not the ports labeled RX OUTPUT TO SPEAKER.
Play a familiar TV program to test the sound.

Important: The TX INPUT FROM TV ports receive TV audio. The RX OUTPUT TO SPEAKER ports are used for receiver or pass-through connections.

Expected: The TX and A indicators are solid white, the correct audio input is selected, and sound plays through your Bluetooth headphones.

TX and A Are Solid White but Still No Sound?

Solid white TX and A indicators confirm that the Bluetooth connection has been established.

Confirm the TV is playing a program with sound.
Check that OPT / AUX matches the cable connection.
If using Optical, set the TV audio format to PCM.
Increase the headphone volume.
Restart the TV and Oasis Plus.
Test another compatible cable or audio source if available.

Oasis Plus Important Setup Checks →

Using Two Headphones but One Has No Sound?

Confirm the first pair is connected and working.
Check the second pair's power and volume.
Put the second pair into Bluetooth pairing mode if it is disconnected.
Follow the dedicated second-headphone connection guide.

Connect Two Headphones to Oasis Plus →

Headphones Work but the Soundbar Has No Sound?

Oasis Plus supports wired audio pass-through for a soundbar or stereo system.

Connect the TV to Oasis Plus using Optical or AUX.
Connect the soundbar to the matching output under RX OUTPUT TO SPEAKER.
Use matching cable types: Optical to Optical or AUX to AUX.
Select the correct input on your soundbar.
Keep Oasis Plus in TX / BYPASS when using Bluetooth headphones at the same time.

Important: Do not mix Optical input with AUX output, or AUX input with Optical output, for the pass-through connection.

Oasis Plus Soundbar Setup Guide →

Headphones Still Won't Reconnect? Reset Oasis Plus

Use this only if your headphones cannot reconnect after normal pairing attempts.

Turn on Oasis Plus and select TX mode.
Press and hold the + and − buttons together for approximately 7 seconds.
Continue holding until you hear "Pairing history cleared."
The TX indicator should then flash green and white alternately.
Put your headphones into Bluetooth pairing mode and reconnect them.

Important: The voice prompt confirms the reset. TX and RX have separate pairing histories. Resetting TX does not clear RX.

Oasis Plus Factory Reset Guide →

Using Oasis Plus in RX Mode Instead?

If you are streaming audio from a phone to a wired speaker, use RX mode rather than the TV transmitter setup above.

Move Oasis Plus to RX.
Connect the speaker to RX OUTPUT TO SPEAKER.
Select the matching input on your speaker.
Connect your phone to Avantree Oasis Plus through Bluetooth.
Confirm the RX and A indicators are solid white.
Increase the phone and speaker volume and test audio.

Oasis Plus RX Mode Setup Guide →

Still Need Help?

Tell us your TV brand and model, Bluetooth headphone model, whether you are using Optical, AUX, or RCA, whether the TX and A indicators are solid or flashing, and which OPT / AUX input is selected.

ASK A QUESTION