Google shows your TV is a LCD RPTV, so it's probably a digital TV and the clipping pattern might apply. If you turn down contrast (maybe picture being a Sony) and still can't see flashing bars on either the second or thrid pattern, then I'd guess something would be clipping the top-end of the grayscale. Some digital TVs have controls that can clip the top-end of the grayscale, and some sources might clip the top-end of the grayscale. I've never seen your TV and you don't list the source so I really can't make much of a guess why you wouldn't be seeing the bars. With typical settings neither my TV or sources clip the grayscale, and only my computer expands levels and clips by default.