rafaela wrote:
Your PCB only need a (washing machine) , nothing else.
XRONIS
Yes, contacts look a bit overused, but most likely that is not the problem. You can try to clean the contacts and try again. Maybe you get lucky. But since this happened after the power cable issue, more so realistic is the theory that you have some damaged components due to over voltage. If you know electronics and have a multimeter you can test out the board. Assuming of course you have a good multimeter and assuming you are good with a soldering iron. This of course would also require you to replace any damaged components and some components can not be properly tested with just a multimeter. Which would bring you back to square one. Yes, this board has the rom inside of the MCU ( IC chip). Yes, more or less a copy of the rom content is also available via SA. But it's not quite that simple and again you would need some professional equipment and some experience to perform this.
Therefore In my opinion your best choice is to send your drive to a pro.
Good luck!