From what I understand "banding" issues are pretty serious. Let's hope it's your HDMI cable, although that almost seems unlikely as they are fairly constant and reliable.
I suppose you'd have to figure out the "problem" by process of elimination.
Do you have a friend or someone that could bring over his/her PS3 and see if the problem persists? If it goes away, then you know it's most likely your PS3, but somehow I doubt that. I think "banding" issues are inherent to the TV's, and not the componants. But I could be wrong as I am far from being an expert.
I hope you get it solved!
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