Not starting and Logic board debug

Question

Mac Mini Mid 2011

发布于2011年7月21日。Core i5或Core i7处理器。雷电（Thunderbolt）接口。本机也用于Mac mini Server配置。

204 个问题查看全部

Alpaca @sudo_rm

声誉积分: 1

2

发帖于: 2021年1月24日

更多选项

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.

回答此问题我也有这个问题

这是一个好问题吗？

是否

得分 0

6条评论:

Did you replace the NVRAM coin battery?

由 Dan 完成的 2021年1月24日

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

由 Alpaca 完成的 2021年1月24日

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

由 Dan 完成的 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?

由 Alpaca 完成的 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?

由 Alpaca 完成的 2021年1月25日

显示更多的1条评论

添加一条评论

1个答案

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 声誉积分: 479.4千 Self employed contract worker 35 329 971 · Answer 1 · 2021-01-25T07:22:29-07:00

Dan @danj

声誉积分: 479.4千

Self employed contract worker

35

329

971

发帖于: 2021年1月25日

更多选项

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.

这个答案有帮助吗？

是否

得分 0

2条评论:

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.

由 Alpaca 完成的 2021年1月26日

Also no obvious burns or corrosion on the board

由 Alpaca 完成的 2021年1月26日

添加一条评论

Mac Mini Mid 2011

Not starting and Logic board debug

1个答案

添加你的答案