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I got a 820-4924 macbook that has no signs of liquid damage. The customer brought it because it was shutting down out of nowhere. What should I measure first?
Check for pulses means to check if you get any voltage pulse; no need an o-scope.
Of course, o-scope is better, but not really needed to see if a voltage tries to appear.
3V3_S5/SUS means 3V3_S5 and 3V3_SUS; usually we try to write the essential...
Thank you for clearing that up. Big coil L7520 seems to give a tiny voltage 0.02v at initial contact, but then drops to zero. Big coil L7130 is 12.50V.
Measured PP3v3_s5 is 3.32v and _SUS is 0V
Kind reminder, the Macbook is not steady. Sometimes it will not boot at all; other times it boots but shuts down after some seconds and other times it boots into the operating system and can work for several minutes.