The TV sound works when I unplug the aerial from the myview box and plug it into the rear of the TV. When reconnected to the my view box no sound.
Are you saying problem solved?
Have you enabled the Passthrough ? YV BUTTON > Settings > Picture and sound > Antenna Out Turn on.
If that doesn't work try
YV button > Settings > Picture and sound > HDMI and S/PDIF both set to surround.
How is Soundbar connected and what to ?