How to Troubleshoot your VIZIO Sound Bar
The Vizio Soundbar and TV will not work together if the cable is in the wrong port in either device. The recommended port is HDMI 1 (ARC) on the TV and HDMI OUT (ARC) on the Soundbar. You may also need to enable the ‘CEC’ and ‘ARC’ features, unplug other devices and change the Audio Output settings.