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.
I have suspended the components around, it now shows 1.8V on the L7760 coil, but the fan does not turn.
I noticed that in the thermal camera the component u3900 gets hot.
I had the same problem that OP. I changed u7100 and nothing changed. Afterwrds I replaced Q7100 and it turned on, but, there is something that always keeps on harming the Q7100 .
it turns on, but when I connect the screen or the speaker the Q7100 breaks again.
When it was on , it booted ( Q7510-Q7520 = 0.75 V)