I recently bought the AU8000 65" TV. I've had the Vizio home theater system for a couple of months. On the previous TV it worked without a problem. The old TV wasn't a smart TV, so the video went from the Roku, through the soundbar, and then into the TV.
Now the sound is coming from the TV via HDMI ARC to the sound system. The TV recognized it, and it will have sound. The problem is, when I turn the system on, the bar will connect, and there won't be any sound. It will show it is connected, and when I turn the volume up or down, the system will respond. The only way I can get sound on, is to unplug the system, let the TV sound take over, then plug it back in. It'll recognize the system and kick back on with sound. I've tried doing a lot of different things to no avail.