For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
Board is (and was) not working with that damage. It happened recently, possibly from a surge on 3v3_s5 or via audio circuit. That's not the GPU, it's the PCH. RIP your board unless you feel like replacing it and cleaning the BIOS.