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But without the PCH I will never get the 5V S3? Can I interrupt the 3v3s that go to the PCH get the 5V somehow and then replace the PCH? Otherwise I give up
I eliminated the short by replacing C7252 I checked after L7220 and the low insulation disappeared but still nothing PP5V_S3 probably because of the PCH if I understood correctly
Forcing its enable signal, instead of using PM_SLP_S4_L from PCH.
Remove R7913 and check L7220 voltage.
If no volt, run a wire from R7251 to R7252 abd test again.