Common issue on the px's.
Its going to need a new screen I'm afraid I'd suggest you contact Panasonic who may arrange for a service centre local to you to undertake the repair foc but you pay the Labour charge.
One sure way of diagnosing a faulty screen rarther than board component failure is to ask for the on screen menu and if the line is in front of the menu displayed its the screen._
e manno, April 2015
