Instead of looking for a tv, look for a commercial display. They’re basically a computer monitor the size of a TV. Samsung makes a line that we use at work, and the cost is similar to a mid-range TV. They can function completely without internet.

Something like these: https://www.bhphotovideo.com/c/buy/commercial-displays/ci/35567/N/3538895735

Nine sili nebesniye, Alexander Sheremetiev.