X1 and new 4K tv
we upgraded out tv to a basic 4K tv to get a better picture quality with the X1 cable box. The picture quality is terrible. YouTube has a better picture quality when streaming to the tv. The setting is set for 1080 16:9 and I still see a black bar top and bottom. The picture quality is not even HD. We have basic expanded service. Is anyone else having issues with picture quality? Do I need a different cable box for the Tv? It's hooked up via HDMI from the box to the TV. Any help would be appreciated to get a better picture on the new tv.