Hi, I'm replacing the board of my P1.1.1 with a P2 board. All the ESC's and the G power cable are soldered fine. But the V cable won't hold. I think the initial solder joint (which snapped right off) heated some of the plastic around the gold connector. And now the gold connector is 'smudged' and won't hold any load. I've attached a picture. I tried cleaning the gold connector by heating it and wiping it off with a small brush. But that doesn't work. I can get some fresh tin on the connector, but when I heat it to join the cable, it just comes off... Any help in cleaning this up? Or is the board fried?