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.
CPU overheats and the OS can't boat, without the battery starts normally always, with battery it will boot into OS only if the laptop has cooled down, and crashes as soon as it warms up and has constant 2.3v on vcore.