I have a 60# RCA DLP HDTV, model HD611PW42, 11 years old....when I turn on the TV there is a large dark area in the center of the screen that fades out as it gets closer to the edges...I can see the picture somewhat...I replaced the lamp but it is the same thing. Someone mentioned a problem with the engine assembly. If so, what is involved in fixing this and am I better off looking for a new TV?