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Shift - Fix No Sound

  • Updated

Before You Start: Turn on the Shift transmitter and headphones. Play a TV channel or video with sound.

Step 1 – Check the Headphone Connection

Check the channel lights on the headphones and transmitter. Both should be solid and the same color.

Solid Blue – Connected to Channel 1.
Solid Green – Connected to Channel 2.
Solid White – Connected to Channel 3.
Flashing Blue – Pairing mode.

Channel colors don't match?

  1. Use the CHANNEL switch on the headphones. The headphone's LED channel indicator will change color. Select the color that matches the transmitter's channel indicator.

Still not connected? Follow the Shift pairing guide below.

Shift – Pair / Add Headphones →

Step 2 – Check the TV Audio Cable

  1. Make sure the TV audio cable is firmly connected at both ends.
  2. Connect the TV's audio OUT to the transmitter's INPUT FROM TV, not BYPASS / SPEAKER.
  3. Use the matching connection: OPTICAL or AUX.

Step 3 – Check TV Audio Settings

Open the connection you are using:

Optical Cable
  1. Connect TV Optical OUT to transmitter OPTICAL – INPUT FROM TV.
  2. Set TV Sound Output to Optical / Digital Audio Out.
  3. Set Digital Audio Format to PCM / Stereo.
Find PCM Settings for Your TV →

Still no sound? If a soundbar is connected through HDMI ARC, temporarily disconnect it and test the headphones again.

AUX / 3.5 mm
  1. Connect TV Headphone / Audio OUT to transmitter AUX – INPUT FROM TV.
  2. Set TV Sound Output to Headphones Out, if available.
  3. Increase the TV volume.
Red / White RCA
  1. Connect the TV's red and white Audio OUT ports to the transmitter's AUX – INPUT FROM TV using an RCA-to-3.5 mm cable.
  2. Make sure the TV ports are labeled OUT, not IN.
Step 4 – Check the TV Audio Signal

While the TV is playing, check the transmitter's OPT/AUX indicator.

OPT/AUX Solid (Steady) – TV audio detected.
OPT/AUX Flashing – No valid audio signal detected. Check the cable, TV sound output, and PCM setting if using Optical.
Step 5 – Check Volume and Mute
  1. Increase the headphone volume.
  2. Press the headphone Mute / Unmute button once to make sure sound is not muted.
  3. Increase the transmitter volume if needed.
  4. Try another TV channel or video.
No Sound on Netflix, Prime Video or Cable Box?

Start playing the program, then set the TV or streaming device's digital audio format to PCM / Stereo.

Cable Box Audio Settings →
Still No Sound? Restart
  1. Turn off the transmitter and headphones.
  2. Reconnect the TV audio cable firmly.
  3. Turn on the transmitter, then the headphones.
  4. Make sure both channel indicators show the same solid color, then test again.

Still No Sound?

Tell us your TV model, cable type, headphone/transmitter channel colors, and whether the OPT/AUX indicator is solid or flashing.

Contact Avantree Support →

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