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.
Only need to read and write down notes from the forum threads.
See what symptom causes a missing signal.
Then you wil know what to check.
Of course various signals can cause same symptom, but you know at least which ones.
Is important to understand signals order for the power on sequence.
This forum section is for repair assitance.
Louis has online training I think.