I recently acquired a VIZIO LED M420SL from a friend since it had some issues and i thought i would try and fix it. As seen in the pictures there are a couple things that happen. First, upon startup there are several vertical yellow lines on the left side of the screen. Those go away quickly, but then the left side of the screen is dark and shows trails of everything. I ordered a TCON board of EBAY and put it in today with no luck. Perhaps it was another bad TCON board ($18.00)? or perhaps there is something else going on?
For Tv repair shops, defective panel = replace the Tv unless it's under factory warranty. Tv repair shops do not attempt any repairs on display panels. You know as much as I do if you have seen youtube.