Originally Posted by stash64
I spoke to the tech that will be servicing the "buzz" in my TV this upcoming Monday. He acknowledged that the buzz is a common problem on the 2012 Panasonic plasmas. He even asked me if the sound was originating from the upper left when viewing the TV... which I acknowledged. He said it is coming from the SS board and he will be replacing all mounting screws for that board and a second board. The original mounting screws apparently do not properly ground the boards. The repair will take about 45 minutes.
Fingers crossed... if this fix doesn't work, the TV is going back to Amazon. I don't want to return it, but the buzzing makes cringe any time there is a bright scene.
Tech was a friendly older gentileman and he did exactly what he described and replaced about 25 screws, including all the screws used for mounting the SS board. The original screws were washer heads and the replacements came with captured spring washer and larger diameter flat washer. The replacement screws with the larger washers had more contact surface but, from what I could see, the original washer head screws had sufficient surface area to proprely ground the boards. So the only difference in my mind was that the replacement screws would be less likely to loosen up because of the spring washer.
Bottom line, the buzz is just as bad or worse now. The tech offered to come back and replace the SS board, but I've had enough. I've already arranged for a return with Amazon and will probably do without a TV for a few weeks or maybe even a few months... to see what Panasonic has to offer for the new model year. I sure hope they have sorted out this problem by now as I really want to stick with Panasonic. Don't care for Samsung.
If anyone else decides to try a repair, I recommend that you ask the tech to bring a replacement SS board. The screws alone won't help if you have a bad case of buzzing. I am a bit surprised/disappointed that Panasonic doesn't replace the board as a first resort.