The reason I like Gray Jay is that it is source agnostic, so you can still use YouTube (because that is where the content is now) while also using other sources.
I think you will need a power supply for your panel in addition to a driver board like this. This only provides the signals needed to switch the pixels but not the power to drive them. Some of these include backlight drivers but even then I think you would probably need more current for a TV than these provide.
I retired from embedded systems design and design-for-manufacture a decade ago. Reading datasheets was most of the job. This doesn't look too daunting. It's a single interface between two readymade components. I've identified where some issues might come up, and there are probably some that I don't know about yet. Still this seems less like building a circuit around existing ASICs and more like hooking up stereo equipment to me.
On Roku smart TV from Walmart. I was present in the returns line when a customer returned it because he wanted something to use with his Dish Network receiver and this one required he creat an account.
I don't think anyone repairs these things anymore. I found two dumped in the desert, one with its controller and power supply boards removed and one that was complete.
I got interested in this when the previous poster asked the question. Going down the rabbit hole I think I have my answers. Avnet has some good info on the mipi interface for consumer devices. It's been very interesting and I do see it as a path to building good, cheap, large displays.
So if anyone is interested I found the answer to my question. There seems to be two standards for LCD panels and there are these cheap converters for both of them.
They are made for laptops, and I am sure they work there. There was a post here about 15days ago asking about unsmarting TVs but it has been deleted. That got me thinking about this solution.
Seems like this would be a good place to get rid of those end-of-life A10s.