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.
if you get S0, do you get ALL_SYS_PWRGD?
I notice you mentioned you messed with u1950. if improperly soldered or not working correctly it could cause All S0 but no chime.