u/Dry_Newspaper4237

For quick reference I got the nes for free and looking forward to fixing it up. It sat in a shed for a few years. I replacedr the 72 pin connector because originally it was giving me a blinking red light but once I replaced that it recognizes the games but is giving me a solid grey screen. On the motherboard edge though is this stuff I honestly have no clue what it is I have tried isp 91% and nothing is working. Any help would be appreciated I’m just tryna see if I’m screwed or if there is any hope.