- Check the TV volume.
- Make sure the TV is not muted.
- Check the HDMI/audio connection.
- Restart the STB.
- Try another channel.
If sound works on other channels but not on one specific channel, report the affected channel to [Support].
- Check the batteries.
- Replace the batteries if required.
- Make sure nothing is blocking the STB.
- Point the remote towards the STB.
- Restart the STB.
- Try the remote again.
If the remote still does not work, [Contact Vianet Support]