I spent another hour checking various voltages on the board but was not really finding anything of value. Sure enough, after a couple of tests I was able to determine that one of the 5v power rails was not holding any voltage which most likey indicated a short on the board. Following an excellent YouTube series on the basics of logic board repair, I started probing around the voltage rails using a multimeter to check if all the power signals were good. The Apple store did mention it was an issue with the logic board, so I at least had a starting point. I recently had some free time around the holidays and was able to dig up the schematics I needed to debug the problem. It seemed like a shame to simply throw away such a nice computer so I figured if I could find some time and the right schematics for the board, I might be able to save the machine from the dump. Wanting to charge the same amount of money it would cost to purchase a new mac for a replacment logic board, it effectively rendered the machine totaled. For two years I’ve been storing a broken MacBook Pro in my closet that would no longer boot and was not worth a repair according to Apple.
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