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The fan requires 5V_S0, so the S0 state is reached.
You've found missing S0 voltage, but didn't even tell us if that power rail is shorted to ground.
Also check if U8030 receives enable signal; the chip may be bad...
The signal is intermittent. It’s on and off
There is no short to ground.
3v3 enable signal is intermittent too
Pm_slp_3_l is intermittent too. On and off