That's the "A" board, and when the tech showed up Friday, he said 3 of the screws were loose. I helped turn the tv around, but he declined help with the back panel. He knew they can be sharp-edged. I watched anyway, to see what it looked like inside. Oh, and by the way, he also replaced the screws on the board on the right side as well, per panasonic's instructions. Thought you should know.
Back to the normal hum when you stick your head behind tv.
You need the receipt, you only have a year's warranty, the Concierge Service is aware of this problem, so you don't have to worry about getting it serviced quickly. Don't remember when I called, I went to Panny's website and got the info I needed and made the call, the number's on the website. . The whole job took much less than a half hour.
If you don't get it fixed it will just get louder, best to do it ASAP.
I got the firmware update [ apparently there's only one] and I totally forgot to write down my settings, so I've been playing with it for the last few days [ update takes it back to factory settings, which according to the service tech most people use ?????? hard to believe......]
One thing he did mention, in his experience, plasma's seem to last longer than LCD's and are easier to repair. Just thought I'd pass that on.
Glad it worked. Yeah, that update screwed up my picture for a while too. Being almost terminally lazy, it took me a week or so of watching a crappy picture to finally work up the energy to spend the ten minutes it took to get my good picture back. Next hum I hear, I'll be in the back of that sucker and I'll put the lock washers on myself. Wearing heavy gloves, of course.
This sounds like a simple job anyone with a little knowledge of tools could do, but if you don't take a lot of care with that back cover, you'll be in the emergency room getting stitches. That back cover has edges that are, literally, razor sharp. The Tech who fixed my set was in the ER twice (I think that's what he said) for severe cuts from the back cover.
In short, it's an easy fix, but great care must be taken with that hideously sharp back cover.