Re: A2159 Macbook Pro 820-01598 stuck on 5V

After my last message and many attempts i have managed to restore firmware and recovered the PMU_PVDDMAIN_EN line.

I have tried with a USB-A/USB-C cable and it has not worked, as last I do several tests on a MacBook with USB-C and a USB-C/USB-C cable, after each error turn off and re-enter DFU again, on one of those occasions the message "Installing system" appears for a long time, so much so that it seems like a bug, then it ends without errors and I have fan spin

It has never worked for me with...

Re: A2159 Macbook Pro 820-01598 stuck on 5V

I have the same issue, DFU revive not help :/

Re: (820-2850) PP3V3_S0 Issue

Finally crystal issue,Y3500, no problem in 3V S0 rail.

Re: (820-2850) PP3V3_S0 Issue



Thanks for your answer, it does not seem damage by liquid, nothing worked, tested all the RTC rails, luckily lifting components related to PM_SLP_S4_L I discovered that the problem seems to be in PP3V3_S0, since without that active rail I already have a fan at full speed.

I think the only way is to lift each component related to PP3V3_S0 but there are many, I don't know if is possible try to solve it in another way in this case.

Thanks....

Hi, im stucked in a 2850:

PPBUS OK
PP3v3_S5 OK
PP5V_S5 OK

PP3V3_S3 OK

PP5V_S3 NOT OK (Enable signal Pulsing)
PM_SLP_S4_L Pulsing
PM_SLP_S3_L Pulsing

ALL RTC Signal presents

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When remove Q7830 (3.3V S0 FET) or Q7812 (Enable signal for Q7830) (see attached image) I have full speed fan spin and PM_SLP_S4_L and PM_SLP_S3_L are stable , I tried change these two components with same result, so the problem I think is in the PP3V3_S0, not shorted rail, any idea how to proceed in this...

Re: New Members - please post your introductions here

Hi, im Victor, from Spain, repairing Apple products, nice to meet this forum and all the people on it.