It's a commercial display. Not a TV. if you want it to display something, you need to attach something that provides output.
There's is a very common thread here on HN talking about people wanting to support dumb displays, displays that don't expect you to enter IP addresses before they will even finish first time setups. This 55inch NEC display looks like it retails for a little over $2kUSD.
https://www.sharpnecdisplays.us/products/displays/ma551
