I have a US Sprint version with a Sharp panel and running software version 1.24.651.3 and mine has this noise issue. For me it happens when the display brightness is under 20% and when I go above that it goes away.
As an aside, I have noticed ...
Just got my HTC shipping confirmation
I can see it under pending on my AMEX. Would of been tempted with Very but I wouldn't trust HTC to refund and cancel my order. If they've charged I'm guessing shipping is imminent. Or least that's what I'm hoping lol.