Quote Originally Posted by N. Abstentia
Doesn't sound like a sheilding problem. If if was sheilding your picture would be all screwed up with green spots and swirls and all kinds of cool stuff.

Sounds more like the speaker is vibrating something loose in your TV, doing it only at loud volumes is the dead giveway. If it was sheilding the volume wouldn't matter. It would even do it without the speaker even being hooked up.
I know what your saying, but it done the same thing on my old standerd toshiba crt tv.I just got the hd tv a few weeks ago, i wouldnt think it would do the same thing on two different tvs if it is not a shielding problem, but then maybe it could not sure what to think