I Have had limited success repairing boards, and I have taken at least three shots at it. I have two roasted PowerBook's and i have looked at just about everything, and you really can't tell which components have actually failed. I have tried just about everything, from baths in chemicals such as hydrogen peroxide, and rubbing alchohol, to rebonding solder with a heat gun, and nothing seems to work, the only main board i ever repaired, was the one in my apple 17" Studio Display, and i replaced a Diode that had fried on the main board.