Samsung 55nu7100. I’ve had awful problems getting ARC working. Hit and miss, never remember which incarnation, then stops. Have onkyo 11.2 receiver with tv and projector. Tonight it just would not work, the tv sound settings kept showing receiver when I toggled the receiver on and off, then vanishes. Hit the amazon return, had to phone them as they arranged pickup tomorrow! Then I googled LG ONKYO ARC problems, want one that works, and saw a final post that said they had used a solution seen, which was using a latest and cheapest 4K hdmi cable. Well I had also just got one but not used it yet, it’s long as my TVs on a stand with wheels. It fixed the problems!!! That was all I needed.return cancelled doh. So fingers crossed.
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