Geeetech i3 Pro B 3D printer controller replacement

[lokatseno]

I have a Geeetech printer (ugh!) and the controller just decided to eat itself. I turned it on today to discover that it was totally bricked. I can't program it with the Arduino IDE and while I do have an AVR ISP, I really can't be bothered with it at this point. This controller has many, many serious design flaws and indeed, I've had numerous issues with it. I won't go into great detail about the issues here, but I'm planning on replacing the controller instead of fixing it again.