Be careful some TVs like Vizio, have USB ports that will supposedly let them connect to the TV, debug it, update firmware etc. However it also has a feature where it will lock itself in cases it detects an un-authorized device plugged in. Then you have to call the company to fix it.

It could be a DRM thing or a "we don't like to let people break our TVs".

I found about it because I wanted to play with it, and after reading that on a forum gave up.