Tv channels not going full screen.

[kennelly]

I have a 65" LG 4k tv. For some reason some channels are now boxed and only using about a third of the screen. These channels were full screen before. I've used the zoom feature, on these channels, but I'm now losing picture quality because of it. I tried resetting the tv back to factory settings to no avail. Any help out there?

 

[Calvin7]

Your TV manual likely lists supported screen resolutions. Compare your current resolution to various other size resolutions. It may also suggest a recommended resolution.