Not starting and Logic board debug

Question

Mac Mini Mid 2011

2011年7月21日に発売されたMac Mini Mid 2011モデルはCore i5もしくはCore i7プロセッサ、Thunderboltを搭載しています。

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Alpaca @sudo_rm

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投稿日: 2021年1月24日

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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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Did you replace the NVRAM coin battery?

Dan さんによる2021年1月24日

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

Alpaca さんによる2021年1月24日

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

Dan さんによる2021年1月24日

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 さんによる2021年1月24日

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

Alpaca さんによる2021年1月25日

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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 評価: 478.9千 Self employed contract worker 35 329 970 · Answer 1 · 2021-01-25T07:22:29-07:00

Dan @danj

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投稿日: 2021年1月25日

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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 さんによる2021年1月26日

Also no obvious burns or corrosion on the board

Alpaca さんによる2021年1月26日

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Mac Mini Mid 2011

Not starting and Logic board debug

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