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It is probably not a problem with your tv-set. The problem lies in the videocard.
Just change the pixel format in ati catalyst from YCrCb to RGBFull and it should be ok.
I've found the solution here: http://devforums.amd.com/game/messageview.cfm?catid=279&threadid=118278&STARTPAGE=1&FTVAR_FORUMVIEWT...