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Old 11-18-2021, 05:30 PM   #5
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Join Date: Feb 2020
City & State: Noosaville
My Country: Australia
Line Voltage: 240V 50hz
I'm a: Professional Tech
Posts: 349
Default Re: Missing PP5V_S4RS3 on 820-00165-A

PM_SLP_S4_L is pretty critical. Refer to Piernov's link above for the flow chart for the pre-requisites to get that signal.

But since you are dealing with a 820-00165 board, check to see if you are getting life on the other rails when you initially supply power. These boards have a thing where they will power on all rails right up to CPU Vcore, shut down, start again, then just shut off. You'll only see this behaviour when you first connect the magsafe.
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