I've been going through some of the forums and posts regarding "buzzing" from the 2012 panny plasmas. I just picked up a 65" VT50 last night and got it setup at home. Picture is perfect but there is a loud rhythmic , pulsating , buzz coming from the left lower corner of the tv. My guess it's the power supply giving the sound and location.
Just to be clear, this is not a faint noise, fan whooshing sound. It's very much a cycle. You are able to hear it from over 20' away so not something you have to put your ear up to.
I'm going to contact BB later today regarding and see if they have another unit.
Just wondering if anyone else has experienced something like this , and if so what was the resolution to the problem.