Oasis Plus - Fix No Sound – Avantree Support

No sound from Oasis Plus (TC500P) is usually caused by disconnected Bluetooth headphones, an incorrect OPT/AUX input, or incompatible TV audio settings. Follow these 3 steps to identify and fix the problem.

Check the Bluetooth Headphone Connection

A flashing TX indicator means your Bluetooth headphones are not connected to Oasis Plus. They may still be connected to another device, such as your phone, tablet, or computer.

Turn on Oasis Plus and your headphones, then set the mode switch to TX (Transmitter). Check the TX and A indicators.

TX + A: Both Solid White

Your Bluetooth headphones are connected to Oasis Plus. Continue to Step 2.

TX: Flashing Green / White

Your headphones are not connected. Follow the pairing instructions below.

If Your Headphones Are Not Connected

Turn Bluetooth OFF on nearby phones, tablets, or computers previously paired with your headphones.
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 and wait approximately 5–10 seconds.
Confirm that both the TX and A indicators are SOLID WHITE. This means your headphones are connected.

How to Put Bluetooth Headphones in Pairing Mode

TV asking to pair with your headphones? Select Cancel / Deny. Your headphones should connect directly to Oasis Plus, not the TV's Bluetooth.

Once both TX and A are solid white, continue to Step 2.

Check the TV Audio Input and Settings

Oasis Plus must receive TV audio through the correct OPT or AUX input. When using Optical, an incompatible digital format such as Dolby or DTS can prevent sound.

Check which cable connects your TV to Oasis Plus, then press the AUX / OPT button to select the matching input.

Optical (OPT)

Connect the TV's OPTICAL OUT to Oasis Plus's OPTICAL TX INPUT FROM TV.

Select OPT on Oasis Plus and set the TV's Digital Audio Output to PCM / Stereo PCM.

Find PCM Settings for Your TV Brand

Using a cable box or streaming device? If TV channels work but streaming apps have no sound, set the streaming device's audio output to PCM / Stereo, when available.

How to Set PCM for Streaming Devices / Cable Boxes

AUX / 3.5 mm

Connect the TV's Headphone / Audio OUT to Oasis Plus's AUX TX INPUT FROM TV.

Select AUX on Oasis Plus, choose the TV's headphone output if required, and increase the TV's headphone volume.

RCA (Red / White)

Connect the RCA plugs to the TV's red and white AUDIO OUT ports. Connect the 3.5 mm end to Oasis Plus's AUX TX INPUT FROM TV.

Select AUX on Oasis Plus. Do not use TV ports labeled AUDIO IN.

Important: Connect your TV cable to the ports labeled TX INPUT FROM TV, not RX OUTPUT TO SPEAKER. For Optical, remove any protective caps from the cable ends.

If the correct input is selected but there is still no sound, continue to Step 3.

Check the Volume and Audio Cable

If your headphones are connected and the correct TV input is selected, low volume or a faulty audio cable may be preventing you from hearing sound.

Play a TV program with sound and make sure the TV is not muted.
Increase the volume on your Bluetooth headphones.
Press Oasis Plus's Volume + button to raise the output level.
If using AUX, also increase the TV's headphone output volume.
Disconnect and firmly reconnect both ends of the audio cable. Make sure the cable is connected to TX INPUT FROM TV.

Still no sound? Try another or a NEW compatible audio cable. A damaged or faulty Optical/AUX cable can prevent sound even when your Bluetooth headphones are connected. Replace the cable, then play TV audio again.

Still Need Help?

Tell us your TV and headphone models, whether you're using Optical, AUX, or RCA, whether both TX and A are solid white, and which OPT/AUX input is selected.

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