It should be a thing because most (all?) "smart TVs" run some variety of Linux, which, as Free Software, is supposed to guarantee the device owner's right to modify the software running on the thing. However, in most (all?) cases, the practical ability to do that has been destroyed by subverting encryption functions against the owner in a process called Tivoization.
It's similar to console hacking. If there is no known exploit, the device is not yours.
LG patched the exploit that made that possible for my smart TV and know I need to wait for another to be doscovered. Unfortunately the Smart TV hacking community is not that active.
It is still possible to buy "dumb" TV's. Tons of businesses need them for display purposes (like at fast food restaurants and corporate expos, etc, etc), but you need to search for commercial displays. Like this one.
Usually that means trying to get Android TV working through USB, but it depends on what tv you have. If you already have an Android TV, just use a launcher like Projectivy. Most people just buy a media box: either an Android based one or apple tv and disable the "smart" tv altogether
It's much easier to run a HTPC on something small like a Raspberry Pi, or an NVIDIA Shield. The hardware on your TV is probably the bare minimum to run its own smart features, and replacing the firmware doesn't guarantee that the TV isn't still phoning home with your data.
What I did was bought a "commercial" television that's intended to either be put in a waiting room and tuned to Fox News all day, OR used as digital signage. It's not quite an Arby's menu board because it's still obviously a television, has a tuner and such, but it has no "smart" TV in it and the backlight isn't as "won't survive a run of Breath of the Wild" like the TCL televisions my parents own. Then I slapped a Raspberry Pi 4 on the back with OSMC on it. Meanwhile I did replace my small form factor desktop gaming rig, so I have a Ryzen 3600/GTX1080 rig sitting unplugged under that television waiting for me to build up the gumption to switch over to it.
I'd think most people woud go for a cheap used ultra Small Form Factor pc or raspberry pi set up
as an htpc. Plug in to either tv screen (via hdmi ) or monitor / projector directly.
Never connect the tv to the internet - or even to your LAN if you're really paranoid.
You can arse around with a remote control a bit bodgy, or just use wireless Keyboard/mouse.
I cant imagine spending the time to jailbreak a tv to get less functionality for more hassle - but i'm sure some crazy will have done it - good luck finding them though.
Seriously, buy an AppleTV. It works standalone without the need for other apple products. Has a fast processor, ability to disable telemetry, good track record of software update support etc. and NO.ADS.IN.THE.OPERATING.SYSTEM.
Using an Android box will result in the same issues you’re trying to get away from with SmartTVs.
If you’re technically capable enough you can build your own HTPC, but due to DRM you’re going to run into issues streaming 4K content from streaming services. And PC and Linux HDR and Dolby Vision support is a rabbit hole.
yes and no, but mostly no
If you have a samsung tv there would be stuff like: https://www.samygo.tv/
webos has an open source version: https://www.webosose.org/
but anything else is even fewer and farther inbetween
It's a regular app, doesn't require root (though it benefits from it). It's free unless you want complicated parental controls (I pay for it but otherwise have no relation to it).
I have a Bravia TV, and with it I no longer have ads, I can change exactly what apps show up, including hiding Sony apps, and can totally customize the whole window.
Finding it was a huge relief for me, as there's no point setting up parental controls for a small child when ads showing horror products show up anyway.
i'm in the EU. if i order a screen/panel that can do tv or is smart i pay more on import taxes.
so the obvious is to buy the dumbest panel you can get and slap some SBC on it yourself.
still want to use cable and sat? tv headend is just great for that amd more as you can mix cable, sat and ip tv.
your sbc (or nuc etc) can run stuff like kodi and you're good to go.
you still want android apps for a tv? go add some cheap fire tv stick. i dont know of any droid app i still would need. used to have "pluto" but turns out thats just boring too.
There's a whole lot of different smart TVs. If you want help, it would be useful to provide the brand of smart TVs as well as the operating system that it's running.
This would be awesome, but something else I thought of would be DRM. If you don’t have the correct version (like Linux and a few android custom roms) then you would stream at really low quality. So if you even came up with a free smart tv os, it would lack quality streaming