I was getting the 7 blinking lights on the led, so after some research I tested the boards and found a short at one of the ribbon cables on the SU board. I ordered a new SU board and replaced it and the 7 blinking lights went away but now I am getting a very loud buzzing noise. The noise sounded like it was primarily coming from the SS board so I went ahead and replaced the SS and SD boards. I am still getting the buzzing noise and am not sure what to do next. When I disconnect the new SU board, the buzzing goes away and I get the 7 blinking lights again.

Televison & Video - Panasonic