High risk low reward. the eFlash would almost certainly be wiped in a reset. If you did get to it, it's not removable. If you unsoldered it, the new one could need a base load on it for it to work. You could probably buy a used board from another TV, but it could well already have issues. Getting the screen off and back on in one piece isn't trivial.

A friend of mine recapped his 75" Took most of a day, it did fix the tv, but he complained that it was definitely not worth it.