Quote Originally Posted by FABombjoy View Post
You need to change them all before troubleshooting further. All the surface mount caps will be bad. I've even seen that little non-surface mount cap on the controller PCB leak, too.
This. I've had the same thing happen with GameGears and replacing them all usually fixes it, stopping half way is only introducing a variable into the equation that is not necessary and will render the whole thing unsolvable.

Finish replacing them and get back to us, I think you'll find it works fine now.