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USB ports on late 2012 i7 2.6GHz

 
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CHOODALLS
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Joined: 09 Aug 2007
Posts: 118

PostPosted: Sat Apr 08, 2017 7:57 am    Post subject: USB ports on late 2012 i7 2.6GHz Reply with quote

On eBay this week I picked up a spares/repairs Mac Mini on which everything else is working except that the rear USB 3.0 ports are dead. Seller correctly declared this and I am now troubleshooting.
It certainly is a hardware fault (I have done all the resets etc) and I have discovered that the ports had no USB power supply and that when supplied with a 5volt supply from an external source, they do spring to life.
Now I need to discover why they are not self powering.
My guess is that there may be a tiny fusible link (or 4) that has blown or that there might be a power management issue.
I really don't have too much to lose on this and will be opening up the machine and fully stripping it down to investigate.
If anyone has any particular experience of this issue (or advice) I'd be keen to hear it.
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