Mine seems to be doing the same thing. A loud, deep, slow rhythmic buzzing that is NOT dependent on picture brightness. Not sure if I will exchange or not. I've heard that it can stop buzzing after awhile. My main concern is that the buzzing is due to a faulty part that could lead to an early failure. I did not purchase an extended warranty but now I'm considering one from costco. I really don't want to go through the hassle of exchanging but I will if I have to. Luckily I bought it from Best Buy, not online.
Any have any suggestions, thanks.
BTW everything else seems fine with the set, another reason I'm hesitant to exchange. Don't want to trade one problem for another.
Edit: I just thought about having Panasonic service my set. Maybe replace the Power Supply? At least that way I can keep the set which is otherwise flawless. What does everyone think? Would that fix it?
NHT speakers, Denon 4520, 65VT50