I just bought a non working Sega Harley Davidson and I need some help. This has a 520-5300 CPU board. The board had a little acid damage that I cleaned up. I've been through all the boards checking fuses, reflowing or replacing connectors. I replaced u209 and u213 because I had them on hand and they were socketed. Right now all my lights come on and stay on except my blanking led, it flashes. Where should I be looking for my problem? Any help would be amazing.