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2.4GHz, 2.7GHz, or 2.8GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.8GHz) with 6MB shared L3 cache. Released February 2013.

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Shuts off if not connected to power

I have successfully swapped out the logic board on my MBP with a solid part from the iFixit store. It seems to be working great except for when I unplug from my Thunderbolt Display and work without power adapters. It works for about 5 or ten minutes then it will lock up. I’m planning to open it back up and triple check (because I already double checked) the power to the board. But I wanted to see if there was anything else I should be aware of before doing that. SMC, PRAM, Apple Diagnostics all came back fine.

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This does seem really strange, have you tried swapping SSDs with a known working machine? I had a mac that was doing that same thing once without the thunderbolt display, and it turned out to be the SSD failing on me. I recommend you back up your data as soon as possible whatever you might do, as it’s near impossible to get data off a dead SSD.

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