There was a LCD made a few years ago that someone brought to me to be fixed last summer. It would turn on then after a couple mins turn off and you had to let it "cooldown" to get the most runtime from it.(not that it was usable in that condition)

Ten mins to crack it open and look what we have here! Bad caps. Replaced those and it worked properly and the picture quality improved very significantly.

So yea, guys, if you like to solder and can get a cheap/free display, look into it. Granted, many LCDs considered faulty may have hard/impossible to fix problems but it is worth a try imo.