TV etc. connection help

Hello
I have a LG OLED65B8PUA, VIZIO SB46312-F6-46 3.1.2, and a 4k (i was told) Xfinity DVR.
It was connected by a friend but I'm having issues as the TV switches to an inactive input every time it is turned it on and the soundbar audio breaks up.
Can anyone let me know the best way to connect this equipment?
Thank you in advance!


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