Panasonic TH-50PX80A blinks 7 times

SOURCE: my panasonic th-50pz800u won't power

A red light blinking 10 times means that a video board has gone bad. Contact Panasonic to see if they will help you out.

SOURCE: TH-42PX80U JUST TURNED ITSELF OFF

The 7 blinks indicates that a failure has happened within the Y main and the upper and lower y drive panels. I recommend you taking it in to a Service center for and evaluation.

SOURCE: Panasonic Viera TH-42PV7HS Plasma does not turn

replaced su or sd board and check sc board

SOURCE: panasonic model #TH-50PX75U wont turn on, it

Usually seven blinks indicates a Y sustain problem. Its either the Y sustain pcb and/or the buffer boards. I would highly recommend calling an authorized service center for this if you don't know what you are doing.