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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
Try to put logic on your job.
We can't help, if you don't provide correct information.
12.2V and 12.5V (PPBUS_G3H) is totally different for MacBook boards; it denotes good (or not) communication between SMC and ISL6259.
As you make such errors, is also better to post voltage level instead of "present".
When you talk about a power rail, PLEASE specify it.
There are 3V3_S5/SUS/S4/S3/S0 lines.
What sould we understand when you say "3V3"???