I wonder about this every time I see a smart TV-related thread on HN. I recently purchased an LG OLED (C5 48") because my old TV died so I'll finally comment. As others have said, just don't connect it to the internet. But you knew this already, so I'll provide my anecdote on the experience of this since I wondered the same thing for years before getting this TV.
When the TV is never connected to internet, and you use a single HDMI source like me, the TV acts completely like a dumb TV. It gets turned on via my AppleTV remote and displays the picture 1-2 seconds later. No LG logo (I disabled this), and no smart interface shown whatsoever.
If you want to change settings, you can display the settings interface via LG remote control and it generally acts like a dumb TV (not blocking the entire screen, so you can adjust picture quality and see the result as expected).
I've had the TV for about two months and never been asked to update it or shown any ad. The only time I've ever seen the smart fullscreen interface is when you unplug a live HDMI source and the TV detects that nothing is there. (If you turn the source off, it tells the TV to turn itself off as well.)
Hope this helps since it's a lot easier to buy a nice smart TV and do it this way than find a truly dumb commercial panel.
They could also make agreements with ISP's where their TV's can be whitelisted for access to a public or potentially unlisted WiFi, enabling them to connect that way, without the vast majority of customers ever being aware.
Similarly, these TV's could connect to any open wifi hotspot it can find and phone home/download updates that way. Cox for example proudly boasts how more than 4M of it's residential customers modem+router+ap's can be used for "WiFi Hotspots" by anyone - not just the customer/resident - if they have a cox account. I don't see why Samsung or any other manufacturer may approach said ISP's to use this network to update devices under some guise of "convenience" or "seamless updates" ostensibly for their less tech savvy users.
I don't know if these business deals exists, but "smart devices" will often try to phone home/update anyway they can, even if you don't manually configure it on a private network.
Mine is a Vizio from Target that's never been online. I've gotten close to cutting its wifi antenna circuit to prevent this but I think I got it before they started programming anything like this in and I should be safe if it stays offline.
But then I still think about cutting it in case I ever have anyone over that would be stupid enough to sign in to the wifi on it. Better for it to have never happened.
Totally correct and a good call out. I did check this as best as I could for this particular model of TV. But I'd have to do the same in a few years if it was ever to be replaced. I suspect I'll have to desolder the cellular module of my next TV circa 2036...
When the TV is never connected to internet, and you use a single HDMI source like me, the TV acts completely like a dumb TV. It gets turned on via my AppleTV remote and displays the picture 1-2 seconds later. No LG logo (I disabled this), and no smart interface shown whatsoever.
If you want to change settings, you can display the settings interface via LG remote control and it generally acts like a dumb TV (not blocking the entire screen, so you can adjust picture quality and see the result as expected).
I've had the TV for about two months and never been asked to update it or shown any ad. The only time I've ever seen the smart fullscreen interface is when you unplug a live HDMI source and the TV detects that nothing is there. (If you turn the source off, it tells the TV to turn itself off as well.)
Hope this helps since it's a lot easier to buy a nice smart TV and do it this way than find a truly dumb commercial panel.