Not starting and Logic board debug

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Mac mini Mid 2011

2011년 7월 21일에 출시되었습니다. Core i5 또는 Core i7 프로세서. Thunderbolt. 이 기기는 Mac mini Server 구성을 실행하는데도 사용됩니다.

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Alpaca @sudo_rm

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게시일: 2021년 1월 24일

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Not starting and Logic board debug

My a1347 Mac Mini has been turned off for a few years and now it will not start. When I press the power button the fan goes on for a second, the light goes on for about a second too and it makes some sort of sound. The sound is not the fan as I also hear it with the fan disconnected and I have some distant memory of that the sound always there on start.

I have checked that the power supply gives 11.8V on all 4 pairs as of this guide so it appears to not be the problem. Complete Dead - How To Check Power Supply Vs Logic Board

So now I am rightly of wrongly looking at the logic board. I have read in a few other forums of failing capacitors near the power supply on Macs. Can someone point out where in the photos these might be? Other ideas of where/what to check and how are also appreciated.

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예 아니요

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Did you replace the NVRAM coin battery?

Dan 의 2021년 1월 24일

No but I measured it to be under 3V. Is that enough voltage?

Alpaca 의 2021년 1월 24일

If the system had been sitting unplugged it will need replacing. I would start there.

Dan 의 2021년 1월 24일

I changed the old battery (2.9V measured) to a new one (3.3V measured) but it didn't help. Still the same when starting the Mac Mini. Any other ideas?

Alpaca 의 2021년 1월 24일

So can anyone point where the capacitors are on the logic board that are related to the power supply?

Alpaca 의 2021년 1월 25일

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No but I measured it to be under 3V. Is that enough voltage? — Alpaca
If the system had been sitting unplugged it will need replacing. I would start there. — Dan
I changed the old battery (2.9V measured) to a new one (3.3V measured) but it didn't help. Still the same when starting the Mac Mini. Any other ideas? — Alpaca
So can anyone point where the capacitors are on the logic board that are related to the power supply? — Alpaca

Dan @danj 평판: 479.1k Self employed contract worker 35 329 971 · Answer 1 · 2021-01-25T07:22:29-07:00

Dan @danj

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Self employed contract worker

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게시일: 2021년 1월 25일

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Sadly, as far as I know Apple never offered schematics and board views for the Mac Mini systems. So trying to nail down what is bad gets tricky! You’ll need to carefully inspect the logic board for burnt parts, staining or corrosion damage. I would give it a good clean as sometimes dust hides things.

Otherwise, it’s time for a new logic board.

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Still, I can’t get this to start, for reference I have tried this

Measured the power supply both on the connector and the exposed pins on the board, 11.8V

Changed the 2032 coin battery

Cleaned the board with electronics cleaner

Tried the CMD-Alt-P-R combination many times.

Now I am considering a used logic board if I can find it for a reasonable price.

Alpaca 의 2021년 1월 26일

Also no obvious burns or corrosion on the board

Alpaca 의 2021년 1월 26일

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Mac mini Mid 2011

Not starting and Logic board debug

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