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Hi. I have a board with PM_SLP4 missing. PPVRTC_G3H is at 3V and not 3.3V Is this indicative of a dead CPU/PCH? Signal is coming from U0500. I'm not aware of any steps that comes before that. 18.5V 0.021A from PSU PPBUS_G3H 8.59V

Alright, hmmm. Should I maybe investigate components that use PPBUS_AON or the ones that are needed to create PPBU_AON? Chicken or egg situation. Tricky stuff. PPVDD_SOC_S1 has lower resistance to GND. (marked with red square at the top of this thread) Is this not a possible reason?

Black on GND and red on PPBUS_A ON : 0.501 RED on GND and Black on PPBUS_AON : OL

Turning it on and off fixed the problem. This one is fixed!

It worked! DFU recovery fixed the machine. The strange thing is that I already tried DFU after getting 20V on the charger. I tried a different USB-C cable (original mac charger USB-C) and now it worked. I used both schematics. 01041 and 01814. I honestly could not tell the difference. Thank...

Hi. Yes the fuse is fine. 0.01ohm resistance. I replaced it and even bridged it with copper wire just to try. The result is the same. Voltage drops to 1V after resoldering fuse.

Hi. I believe this one might be braindead, but I would like a professional opinion before putting it to rest. A1990 820-01827 Liquid damage around CD32 and U9580. Got 5V on charger. I reflowed CD3215 and U9580 and 20V was restored. Board draws .450a and T2 Chip gets slightly hot under...

Does 12.3V from ISL mean that the CD32 charging circuit is operational? Are the U8100 and U7700 the PMU BUCKS? PP3V8_AON 0.338 PPBUS_5VS2 0.505 PP5V_S2 0.256 PP3V3_S2 0.426 PP3V3_AON 0.500 PP1V8_AON...

What classifies as a secondary power rail? All rails that are derived from PPBUS_AON or a PPBUS_G3H equivalent?

12.295V on C5254 when fuse F5200 is removed. What does MLB stand for? edit: (NVM, Main Logic Board)

PPBUS_AON 1V D 0.500 3V8_AON 0V D 0.449 One of the CD3227 was cycling different on the UDB-C meter. I forgot one step. After replacing the CD32 both chips were cycling at 5V 30mah. I then reflowed UD550 because it had corrosion on it and that is when the amperage jumped to .450mAh. I...

Thank you for the warm welcome! I took the CD3217 from an A2179. Are they different from each model? I might have made a big mistake! o_O The chip was placed with the dot facing in the same configuration as the image I provided under. The motherboard is in the office. I will measure and...

Hi. This is my first post. I have limited experience with the M series of MacBooks. I consider myself decent at soldering but I lack experience when it comes to more advanced motherboard troubleshooting. I hope I can learn something from all of you! Thank you. I have a 820-02016 with liquid...