At this point my advice is against purchasing used Viking's off of e-bay, unless of course it's from Rapidcontrollers.co.uk (Ben Clarke) or one of the other guys who actually works on Viking's from time to time. 9 times out of 10 there is something wrong with the e-bay controllers, even if we can repair it you'd have to pay out of pocket. It's hard to say what's wrong with the controller, I always worry that somebody opened it up to install some of their own aftermarket mods, tore some wires and the modchip, then closed it back up to sell it.