Toshiba TP50H60 50" Rear Projection Television "rid black lines across top" Questions

...black bars on the side. [never wide screen HD format]. MITSUBISHI says the problem in in my directv hd receiver. Wrong!! I replaced the hd receiver with a new one. --SAME DAMN PROBLEM!! So it is ...

...rid off the whiteish lines. adjust this knob counterclockwise in a darkened room untill the color shows a black and white picture. adjust slowly as the set will be monitoring what you are doing and ...