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.
Do not confuse turned on board with working board!
Your board turns on at least.
Check now if you get S0 voltages, especially VCORE.
If present, check for USB activity.