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Hi, i'm back. With known good battery and trackpad the problem is the same. Reassembled the Macbook, noticed that PP3V8_AON is fluctuating between 3.3-3.8V when battery is installed and charger not connected. Is this normal? Any suggestions what should i try next? Thank you.

Okay, it's unanswered. Took the board to a specialist, they replaced NAND with same type/capactiy NAND from an iCloud locked board, still the same. When i plug the usb-c charger it switches from 5V to 20v and then reboots in a loop instantly. PPBUS_AON is switching between 12.06V-12.36V (even...

Okay, i ask differently. If i remove a NAND from a working board does it make the same the symptom i have? (When i plug the usb-c charger it switches from 5V to 20v and then reboots in a loop instantly.) Thanks.

Took a deep breath, removed NAND carefully (managed to do it perfectly, no damaged pads, etc.), but nothing changed. When i plug the usb-c charger it switches from 5V to 20v and then reboots in a loop instantly. Is it worth to order a new NAND and solder it to the logic board or this is a...

Thank you. So you suggest a NAND replacement? I'll try to find someone who can do it. Made it successfully on an iPad Air 2 many years ago but i'm not risking it anymore.

The board is not repaired in any way, NAND is original, was not replaced and the logic board is in original state. So i just disassembled the mac and removed the logic board did not want to do anything until you suggest to do so. Just inspected it under microscope for visible faults and measured...

No, it's normal. As i wrote earlier i'm a beginner at these type of work so sorry for being noob. Please tell me what to do next, i do not have an oscilloscope (my multimeter is capable but i'm still a beginner). :) If you are sure that this is the NAND i give up. But previously had different...

P3V8AON in diode mode is 0.144V which should be 0.150V according to schematics and PPBUS_AON is 0.450V instead of 0.496V in diode mode. P3V8AON_VSW1 is fluctuating on charger (just at that side of the L5800 inductor other inductors are stable 3.8V) when no battery installed. P3V8AON_VSW1 at...

Something has changed... When I enter DFU mode via keyboard, there is no more apple logo at the restore process and the gives the same 4042 error, not 4014 as before. Disassembled board again and noticed that P3V8AON_VSW1 is fluctuating between 3.8 and -0.2 Volts. PP3v8AON_VSW1 was pulsing...

Tried to connect charger cable before DFU cable. Tried with both charger and battery connected. Tried with another host machine, with newer macOS installed.

Borrowed an M1 macbook Air, enters DFU mode flawlessly. Tried to restore but nothing happens, error is: "The system cannot be restored on this device. Gave up waiting for device to transform from DFU state to DFU state. ((com.apple.MobileDevice.MobileRestore . 0xFCA (4042))

Nevermind. Reassembled the macbook but nothing happens when i press DFU button in DFU blaster. I have an older mac mini without usb c port. Is this a problem? Still can enter DFU mode via button combination.

Thanks. Do i have to reassemble the macbook or i only need to connect the logic board to another computer?

Hello, my MacBook Pro (820-02773 - A2338 M2) suddenly died and was not water damaged. This is my own macbook and this is my first repair attempt (previously repaired ipads, tablets and consoles which had damaged ports or visible faulty capacitors etc.) I have thermal camera, hot air station...