Phillips 27" T.V., Model # 27T500 C101 chassis # 27B502-00AA, only comes on sometimes, & flyback squeaks at turn on, but then set works ok. Press any front button, like menu, the set turns on, then the button reverts back to it's regular function. While on, the set sometimes has a small noticeable horizontal noise in the pix. Can't really see the noise on the scope. Anything common in this chassis? Thanks, Dani.