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.
this mac suffered oxidation in the u4200, Q420,U3906 and U3500 region, I replaced the oxidized components, in tests when it enters sleep mode and exits, it shows kernel error.