Wait wait wait. Are all screen interfaces the same? You can just replace the motherboard of any brand TV and it will work? Do all panels use the same voltage/pins/protocol? That's huge, if so.
A vast number of lcds use fairly common lvds interfaces. Boards like the one I bought are compatible with hundreds of screens, native resolutions and signal formats. You pick the resolution, voltage, and format by placing a file on a USB stick and flashing the board. You do have to look up the panel in question to make sure you get it right.
You also must deal with the back light. Mine was modern, so easy. Just a 12 volt led. If it's an old cold cathode, you need a separate high voltage driver. I'd let a screen like that go. You've got better things to do...
I glammed mine up by 3d printing a new little plate for the back to match my new board but that's not necessary.
Woah woah woah. I'm also interested in this. I have a 47" LG Google TV that is horrible to use, very slow, terrible interface that keeps crashing, and seems to never get any updates. The screen is great though, I have a Roku plugged in and would love to just flash the Google TV OS off it with something dumb that booted it into dumb screen only mode. I didn't know I could replace the motherboard like this so easily.
I've done something similar with an old laptop LCD panel, using an LVDS controller that I bought on Ebay. I assume that's basically what noonespecial did, but hopefully with a board that has more TV-useful features (mine just takes HDMI, VGA, and RCA video input, if I'm remembering correctly).
Huh? I don't think you realize what either I or the GP are saying. I'm asking whether the LED/LCD panel on all TVs use the same protocol to drive the pixels, which is how it would be possible for the GP to replace his motherboard with a generic alternative.
