How to DIY-repair fried USB ports on Mac mini?

Accidentally I fried (or so it seems) all the four USB ports of a Mac mini 2 GHz Core 2 Duo 2 Ghz 2 GB 160 GB SuperDrive AirPort Extreme Bluetooth (released by Apple on August 2007) with Mac OS X 10.6.8 Snow Leopard. It was after connecting an iPhone AD/DC to power a USB hub.
I can access the machine using a wireless keyboard but the USB keybord or any other USB device is not recognized when plugged into the USB ports of such Mac mini.
I know that I can carry the Mac mini to a repair service or switching the main logic board, but it costs more than the current price of the machine!
I was thinking of some kind of DIY, even if it requires soldering... Any ideas to replace the fried USB ports with new ones?
Note: the USB ports and main logic board seem OK after visual inspection, but I guess that the former are fried since resetting the PRAM and SMC did not work.
Thanks.

DIY soldering repairs are pretty much out of the question.
Most, if not all, IC's that would be related to the problem
are of the BGA (ball grid array) variety and require special
equipment to remove and replace as all the connections
are under the IC.
The only DIY alternative would be to purchase a logic board
and replace it yourself.  Just Google "mac mini logic board
replacement" for sources and how to's.  Apple themselves,
will not sell you logic boards, so you need to get it from a
third party vendor.  As to which ones are are the most reputable,
I cannot really say.  I would suggest avoiding any Ebay offers
that are not reputable retailers.
As usual, be aware that if a price on such an item is too
good to be true, it probably isn't.

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