Justin, I also recently purchased the PN50C550, and have done extensive research on the burn issue long before i even purchased it. Talk about a flawed design, fail
It doesn't seem to happen to everyone though. In my searching i found that many people who've gotten the burn problem are people who received returned TV's from other owners with children who have sticky fingers and play with the TV settings and screw it up,
or people who simply don't know what they're doing. I haven't noticed any burn on mine, i've had it for 3 days now. Hopefully I won't have that problem though. Since i take no chances I purchased the 3 yr warranty from Square Trade for it which was very inexpensive, i recommend that you do so also. Please let me know if you find anything out or if someone ACTUALLY replies to your question,
as it seriously concerns me greatly since i own the exact same TV you do. And although I got a warranty on it, i don't want to go through the hassle of having to return it. What a f***ing nightmare
i can't imagine this crap happening to me i love this TV. And yes we will both always have to worry burn in. As long we're your careful though, it shouldn't happen.