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.
Figure out if the SMC is turning on first by measuring SMC_RESET_L before replacing it. If it isn't being told to leave reset mode then a new SMC will do the same thing as the present SMC!