In this video, I go over the process of repairing a Mid-2012 15" Retina Apple MacBook Pro, that has an issue where it won't show an image on the screen most of the time, and won't boot an OS successfully. The issue ended up being a faulty power regulator IC for the GPU VCORE rail, which wasn't providing any power whatsoever. After replacing the IC, the machine began working perfectly normally.
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