HeyWatchOutDude
Member
So we can definitely rule out the power rails and sequencing as the main issue before moving on to the NAND task?
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MacBook Air M2 (820-02536) – Power Cycling Issue
- Thread starter HeyWatchOutDude
- Start date
NAND internal failure is known for sudden death symptom.
However we can't rule out all power rails.
Not exact documentation available about how to follow power on sequence.
All related data comes from 3rd part tehnicians; based on their repair experience.
However we can't rule out all power rails.
Not exact documentation available about how to follow power on sequence.
All related data comes from 3rd part tehnicians; based on their repair experience.
HeyWatchOutDude
Member
Theoretically, the power-cycling issue should stop as soon as I remove the NAND chips and power on the device, right?
If the same issue occurs, then the NANDs aren’t the problem or am I wrong?
If the same issue occurs, then the NANDs aren’t the problem or am I wrong?
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You can test that, just in case.
However replacing NANDs will give more information.
However replacing NANDs will give more information.
HeyWatchOutDude
Member
I removed the NANDs, it still power cycles. (but now at 5V / 0.07A)
I don’t think the issue is related to the NANDs. Even without NANDs, it should not power cycle.
I don’t think the issue is related to the NANDs. Even without NANDs, it should not power cycle.
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HeyWatchOutDude
Member
Even with new NANDs same behavior.
Then something else is affected by corrosion.
Can be just one resistor, or capacitor; not easy to find.
BGA chips are suspect also.
Can be just one resistor, or capacitor; not easy to find.
BGA chips are suspect also.
HeyWatchOutDude
Member
I installed the original NANDs again, and the power cycling stopped. I have no clue why or how.
I managed to successfully DFU restore the device, and macOS installed successfully.
Any idea what the issue was? There was no corrosion or damage under the NANDs.
Edit: As soon I click on a language the MacBook reboots.
I managed to successfully DFU restore the device, and macOS installed successfully.
Any idea what the issue was? There was no corrosion or damage under the NANDs.
Edit: As soon I click on a language the MacBook reboots.
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So board reacted at heat applied on the NANDs replacement process.
I still suspect some leakage caused by corrosion somewhere.
I still suspect some leakage caused by corrosion somewhere.