Hi everyone! I just picked up this tv 3 days ago and I've been reading EVERY post this thread has in order to find the solution to my input lag. I've found the solution is to buy a new tv, so I'll be returning this on Friday. Here's what I can surmise:
I'm playing Battlefield 3 on PS3. While the PS3 has a built in upscaler, the game doesn't use it so it outputs at 720p. My understanding is that this puts added strain on the tv to fill it's screen. This added work equals added time. I tried what many said, label it PC, do AV mode gaming. I followed the recommended settings of a few people as well, nothing eliminated it, only slightly lowered it. Other games that output to 1080p or are upscaler to that run almost perfectly with those settings but Battlefield 3 is a crapshoot.
I LOVE this tv. The picture is amazing, the 2d->3d is cool, the smart tv stuff is great, however, I'm a gamer and I don't want to go into the other room to play BF3 on my 32" Samsung. Since the only 3d tvs with low response time are active shutter, we will be getting a 2d tv and will wait patiently for better companies to come along and put real muscle behind the screen.