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i have PP3V3_S5 3.3v and also PP3V3_SUS 3.3v present and also PP5V_S5 and PP5V_S4.
PP5V_S0 is not present, but after speding some more time on it i noticed that R5530 has a bit of corrosion and i need to look into it. I'll update on the status and if needed some help.
R5530 is current sensor for 5V_S0 power rail.
Check traces to U5530.
If resistor is good, board should start in SMC bypass, if there is a problem with that sensor.