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is there a way of protecting the cpu/pch when testing with the PSU? I´ve had now 2 of the same year and model which ended being PCH. It´s frustrating, because it was off, but I don´t know if maybe something I did kill it... Thanks for your comments...
Before connect charger, ALWAYS check diode mode to ground on all big coils.
You should interpret the readings correctly, to see if there is any short between PPBUS_G3H (L7130) and a secondary power supply derived from it.