Just had my old dumb LG TV die after 9 years of working just dandy. I lack the desire to root around for a dead capacitor so I am currently in the market for an approximate replacement to act as the display for my Linux media center in my living room. I figure this is the right crowd for finding a non-invasive TV so my Linux machine can be the brains. I trust modern Tvs less and less.
Desired features
55"
Non terrible audio
As dumb of hardware/software as reasonably achievable
If you really want a true dumb TV, you should look into the commercial TVs
Personally I just get any TV and don't connect it to the internet. I disable any popup interfaces/home menus as much as I can on the TV so I just turn it on and it goes to HDMI1 and that is all the TV's interface needs to do.
I also disable alot of the picture altering features as well. My LG TV has some true motion crap that just made everything a little bit off.
For the most part the handful of TVs I have tried just work.
This is what I do. My Samsung TV can be set to turn on to a specific input, and the "smart" features never get in the way; similarly, it remains permanently disconnected from my home network.
I've heard of them searching for open wifi networks and using them. If I had one and cared, I'd bet the wifi card was removable like in a laptop, and I'd open it up and remove it.
But I own a dumb old CCFL TV that I got for free, and I'm going to use it until I can't any more.
I've been looking for a TV for awhile now, and I've found that there aren't really any practical dumb ones. There are a few models, but they're more expensive and have lower specs, cheaper panels, fewer menu options, etc.
Overall, the smart TVs are going to be cheaper/better because the company plans to make money on target ads, data mining, etc. Just don't connect it or enter a wi-fi password. Sadly that's where we're at now.
IF you have the space, go for a projector. I got a nice short throw 1080 Benq with a decent 120 inch screen. And wow, it's incredible. It's amazing for shows, movies, and games. I paid 800 total for everything. There's everything from 200 dollar to 5k dollars, depending on what quality you want.
Really the best options I have found is to get a device running android tv which has the dumb tv mode. That combined with either not connecting it to wifi or using a pihole for any residuals is probably the most practical option.
not sure how much you're wanting to pay, but this doesn't sound too bad. I'm looking to upgrade soon myself. I have a 40 inch dumb 1080 Element TV. It works well still, but wanting bigger and 4k. I'll probably move the one i currently have to my son's room.
edit: there are some better deals I think. That was just one of the first links. It's only 60hz, you might find one that's 120hz for not much more.