Why go through all of that when you can just block network access, or not even connect it at all? Hell, just get a Blocklist that includes the bad URLs for your TV you don't want it using, and run it on AdGuard or Pihole. Lots of easier ways to work around this.
Unfortunately some TVs pester you when they can't get internet access, or will even attempt to connect to any open WiFi networks in range.
Some have offline ads or can't boot straight to an input, too.
Then there's Amazon trialing having Amazon-powered TVs automatically connecting to any Alexa devices and using them to gain internet access.
I'm not saying OPs suggestion is the best one, for most TVs, what you suggest works very well. But it's good to have more options, particularly as the market continues to get more and more locked-down.
Even aside from all that, if you could replace the controller board, that would open up other possibilities - potentially adding DisplayPort to a TV, for example. Or retrofitting FreeSync if the panel supports it. Or even just plain TV repair without having to pay through the nose for a part you can only get from Samsung/LG/Sony/etc.
Just not feasible though. Smart TVs have everything in an integrated line, from the screen controller, down to the external ports. It's like saying "Hey, I just want to take the North Bridge out of my motherboard because I don't use the features". Not gonna happen.
Now, in an alternate universe, if somebody went down this route and made replacement parts to remove all the cruft, you'd essentially be buying an entire new TV. There is no cost savings there. Buy a monitor, and hook up whatever smart shit you want at that point.
Why go through all that when you can just build a time machine and go back in time to be in the boardroom when someone presents the concept for a smart TV and then hide under the podium and tickle their genitals to distract them during the presentation and then spend the next 20 years in prison for sexual assault where none of the televisions have smart features?
I would be interested in trying this but could I just lock everything except Netflix & Disney? Or have it one way and Keep my streaming but not have anything go from my tv back out?
Yeah, if you want to get fancy with your routing, you absolutely can.
I'm considering doing just that, having my TV and whatnot connect to a wireless SSID that only allows DNS to lookup certain streaming services. I'm not sure how difficult it'll be, but I'll probably play with it later this month.
The sensible approach is to get an Android TV device that you have more control over. You basically have the same freedom with it as with an Android phone or tablet. Plug it into the TV and use the TV only as a monitor/speaker.
Warning: Do not buy cheap Chinese off-brand Android TVs from drop-shipping hellholes like Amazon. These commonly come with malware from the factory. Invest in a quality device with the features that you need.
If you're on a budget, it's possible to make do with a Fire TV Stick, which are often on sale for next to nothing - just don't expect blistering performance or a good UI. They are still Android underneath that awful UI though. You have to fight Amazon's attempts at funneling you towards their own content, but it's doable.
If you want a device that you can easily use for a long time without having to worry about it getting obsolete, get an Nvidia Shield TV or Shield TV Pro. Pricey, but - in my eyes - worth it. At first glance, these may look like every other streaming box, but they justify their relatively high asking prices. For starters, the support for these devices is astonishing, with even the first generation from 2015 still receiving updates. While the current hardware generation is from 2019, it has features you can't get anywhere else, like for example real-time AI upscaling of low-res content in certain apps and (on the Pro model) the ability to serve as a media server instead of just a client:
Hook a storage device up to it (or mount your NAS), add media to them (digitize your home media collection or acquire media from other sources), and use the Plex server application to turn this tiny thing into your own private Netflix that never sees anything delisted. It has enough power to allow you to watch video locally and, at the same time, transcode (=turn media into a format the other device can handle in real-time) up to two more videos (depending on the video files) for other devices in and outside of your home network. This means you could watch something on your TV and at least one other person could watch content you have curated (they don't need a Shield TV - Plex clients are on a wide variety of devices). Given that this is a device that fits into the palm of your hand and needs less than 10W, that's quite astonishing.
Why go through all of that when you can just block network access, or not even connect it at all? Hell, just get a Blocklist that includes the bad URLs for your TV you don't want it using, and run it on AdGuard or Pihole. Lots of easier ways to work around this.
Unfortunately some TVs pester you when they can't get internet access, or will even attempt to connect to any open WiFi networks in range.
Some have offline ads or can't boot straight to an input, too.
Then there's Amazon trialing having Amazon-powered TVs automatically connecting to any Alexa devices and using them to gain internet access.
I'm not saying OPs suggestion is the best one, for most TVs, what you suggest works very well. But it's good to have more options, particularly as the market continues to get more and more locked-down.
Even aside from all that, if you could replace the controller board, that would open up other possibilities - potentially adding DisplayPort to a TV, for example. Or retrofitting FreeSync if the panel supports it. Or even just plain TV repair without having to pay through the nose for a part you can only get from Samsung/LG/Sony/etc.
Just not feasible though. Smart TVs have everything in an integrated line, from the screen controller, down to the external ports. It's like saying "Hey, I just want to take the North Bridge out of my motherboard because I don't use the features". Not gonna happen.
Now, in an alternate universe, if somebody went down this route and made replacement parts to remove all the cruft, you'd essentially be buying an entire new TV. There is no cost savings there. Buy a monitor, and hook up whatever smart shit you want at that point.
We gotta get in there and disconnect the antennas
But I've heard of a few models that don't function at all until connected.... yikes
Why go through all of that when you can just connect the board to the panel.
Why go through all that when you can just build a time machine and go back in time to be in the boardroom when someone presents the concept for a smart TV and then hide under the podium and tickle their genitals to distract them during the presentation and then spend the next 20 years in prison for sexual assault where none of the televisions have smart features?
I'd watch that movie
Then once you get out you can just buy a "commercial display" and not have to go through all that because there's no smort features to begin with.
I would be interested in trying this but could I just lock everything except Netflix & Disney? Or have it one way and Keep my streaming but not have anything go from my tv back out?
Yeah, if you want to get fancy with your routing, you absolutely can.
I'm considering doing just that, having my TV and whatnot connect to a wireless SSID that only allows DNS to lookup certain streaming services. I'm not sure how difficult it'll be, but I'll probably play with it later this month.
Care to bring along a simple fool with you through your journey, maybe share how it goes?
I'll probably make a post somewhere about it here. But I'm lazy, so I don't want to get your hopes up. :)
NextDNS.io is free to start and works great for this
The sensible approach is to get an Android TV device that you have more control over. You basically have the same freedom with it as with an Android phone or tablet. Plug it into the TV and use the TV only as a monitor/speaker.
Warning: Do not buy cheap Chinese off-brand Android TVs from drop-shipping hellholes like Amazon. These commonly come with malware from the factory. Invest in a quality device with the features that you need.
If you're on a budget, it's possible to make do with a Fire TV Stick, which are often on sale for next to nothing - just don't expect blistering performance or a good UI. They are still Android underneath that awful UI though. You have to fight Amazon's attempts at funneling you towards their own content, but it's doable.
If you want a device that you can easily use for a long time without having to worry about it getting obsolete, get an Nvidia Shield TV or Shield TV Pro. Pricey, but - in my eyes - worth it. At first glance, these may look like every other streaming box, but they justify their relatively high asking prices. For starters, the support for these devices is astonishing, with even the first generation from 2015 still receiving updates. While the current hardware generation is from 2019, it has features you can't get anywhere else, like for example real-time AI upscaling of low-res content in certain apps and (on the Pro model) the ability to serve as a media server instead of just a client:
Hook a storage device up to it (or mount your NAS), add media to them (digitize your home media collection or acquire media from other sources), and use the Plex server application to turn this tiny thing into your own private Netflix that never sees anything delisted. It has enough power to allow you to watch video locally and, at the same time, transcode (=turn media into a format the other device can handle in real-time) up to two more videos (depending on the video files) for other devices in and outside of your home network. This means you could watch something on your TV and at least one other person could watch content you have curated (they don't need a Shield TV - Plex clients are on a wide variety of devices). Given that this is a device that fits into the palm of your hand and needs less than 10W, that's quite astonishing.
AdGuard has click-to-block service blacklists. Super easy. Just block everything you don't want, and keep what you do. Should get you 95% coverage.