Hi everyone,

I’m troubleshooting a MacBook Pro A2779 that does not power on.
its my personal laptop and i want to try to fix it, i really need your help.

PPVBAT_AON=12,1 V
PP3V8_AON=CORRECT


Symptoms:

• MagSafe connected: LED initially turns green, then orange
• Measured at MagSafe: approximately 20 V / 3.1 A / 63 W
• The MacBook itself does not boot
• No display, no normal fan activity
• If I disconnect the keyboard / power button flex cable, the fans start spinning
• With the keyboard/power button connected, pressing the power button does

...

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I have a MacBook Pro 13 inch A2238 M2 and it was stuck 5V with 0 amps. I measured some important lines and I found a short on PP3V8_AON_MPMU_ISNS_VIN, I tried injecting 1v and I saw heat coming from the mPMU so I removed the pmu thinking that was the problem. I don't know why I didn't check the other side of the border but there it was, a shorted cap. I replaced the cap and the short was gone, so I reballed the PMU and put it on again but voltage was still stuck at 5V and the current was fluctuating between 0 and 0.45 amps. I checked under the thermal camera and I saw the mPM...