Re: 14 blinks TC-P50ST30

Sorry for bumping an old thread, but I have a TC-P55ST30 that had the 14 blink error. I used a meter to diagnose it and ended up ordering a used A board on eBay. I installed the board and the tv now turns on, but I am getting a very wide black band down the screen. I've checked and double checked all of the ribbon cables and don't see any issues. Do you think jay the a board I received may be faulty? Thanks in advance for the help....