Little word of advice before attaching back panel back on after pots tweak...
Please make sure you have checked all sources i.e. cable/sat receiver, PS3/Xbox or any gaming, BluRay/DVD, and even 3D on Movie AND Gaming consoles. Also, TV menu, and quick menu along with every channel.
All may look swell (Little Rascals word
) when all of a sudden you'll notice some red pixels, lines, artifacts, etc., on a less frequently used source and you'll have to take off again to re-tweak.
The screws on mine may have worn just a bit
thinking I was done without checking EVERY single source. Especially black ops 3D.
As bhazard and a few have posted, it does take a while and you have to be very patient.