Had you put the clam back on ? if so did trap a wire or have any wires become damaged at the connectors and touched the board?
Another thing to check, if you have taken the board out at all, is the silver sticker on the solinoid is not damaged. This is made of foil and could screw any make of board!
Before even fitting a new board, you really need to find the cause, as a simple battery change would not fry it. If you want the looms check, I can do that. If they are ok and you need another Tadao, I have the M5 software ones in stock.
Email or phone (number on the website) if you need any further help.