Chosen Solution
My macbook randomly shuts down. It goes black screen the fans pick up then dies. I’ve tried resetting the SMC. Replacing the heat sink. And giving it a clean. Not sure what else to do. MacBook Pro (Retina, 15-inch, Mid 2014)
To help isolate the problem, hook up to an external monitor and see if it goes down when this happens. Here’s some information on a possible class action law suit and a link to an SMC Update that Apple released to possibly solve this issue: http://9to5mac.com/2013/03/14/15-inch-re… Keep records of any expenses you may incur when trying to resolve this issue as your costs may later be recoverable from Apple.
Reapplying thermal paste of the cpu helped in my case with the same machine for 100%