I actually just bought the same exact tv this past Saturday and when I turned on the first live broadcast sports game I could, it looked like absolute trash. Almost like a mix between SD and low quality HD even though my display settings on the tv said it was reading a 1080p signal. But the streaming services I have through my Xbox One look absolutely unreal and worth every penny I paid. Needless to say, I called Xfinity to set up a tech to come out immediately. They were able to schedule next day service luckily and I did as much research as I could before the tech showed up for my appointment. Of all the posts I read on various sites, I was astonished coming across your post since we have the same tv. When the tech showed up she ran a test on my box and said everything was coming in fine. She even had a little test tv that she plugged my feed into and it looked better than my 4K tv! I read her the suggestions from this thread to her and nothing helped, but she did say she had a 4K box in the truck. I told her I’ll try it out and we set the “display settings” on the box to the highest possible option for 4k. Last night, I turned on the Sixers game and Flyers game and took a giant sigh of relief. The picture looked awesome! Even though the display setting said the signal was still just 1080p. To note though, it still didn’t look as good as the streaming services, but that’s because broadcast tv can’t push out the same quality signal as the streaming services. Even though the regular X1 box can push out a 1080p signal, it seems like you still need to get the 4K box and set it to highest possible 4K setting. It worked for me and just in time for the Super Bowl.
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