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.
SMC is bad. Reflow to see if that fixes, if not then replace. 12.23v PPBUS_G3H means it is not communicating with the ISL6259. When the SMC is communicating with the ISL6259 PPBUS_G3H will be 12.56v. The SMC is also responsible for the green light, as SYS_ONEWIRE is the data line upon which it talks to the battery.