MBP turns off Randomly Without Warning

"It sounds like you may have multiple problems here:

First lets reset the SMC logic so the level of charge the battery has is correct Intel-based Macs: Resetting the System Management Controller (SMC).I would download this little gem to better monitor the battery coconutBattery 2.8.I would also download a good temp & fan monitoring app like Temperature Gauge Pro. While there are others this one is the best one I have found.

Now with the better diagnostic software running what is it telling you? Is the battery worn out? Is the charging circuit having problems? Is the temp running high and the fans not working?

Given the age of your system you may need to clean & reapply thermal paste on the CPU & GPU chips heat sink and clean out the dust buildup thats in the system. But for now lets see what the new tools are telling us.

Snap a few screen captures and post them here so we can see whats up."

"Okay ladies and gentlemen after 4 months of testing I have isolated the issue.

Updated to Mojave problem still persisted

Removed thunderbolt port in Network Preferences problem still persistedReset PRAM problem still persistedReset SMC problem still persistedTook my MBP to the genius bar, all hardware passed diagnostics problem still persistedTook my MBP to mac specialist, said it was a software issue or logic board issue. roll back

OS to previous state problem still persisted

Rolled back to previous state problem still persistedRolled back to Mavericks original factory OS problem still persisted

3 things that could be wrong after this trouble shooting

CPU Core voltage is causing the random shutdowniGPU is bad (requires logic board replacement)Logic board needs to be replaced

Before throwing in the towel to replace the logic board I attempted to try to code the python script posted by Anders Wiggers myself with no success as i am not a coder and spent 3 hours wrecking my brain. So I decided to use the MacMod software for 10$ https://realmacmods.com/product/macbook-... and ran the software which creates a gear spinning on the bar and voila the laptop no longer randomly shuts down! Updated to Mojave and just an FYI the gear is no longer in the bar but the laptop does not randomly shut down.

The problem is CPU core voltage related which is corrected by the python script or the macmods software for 10$. If this does not work it is most likely a logic board issue.

Good Luck"

I made a website while back (https://josefdolezal.github.io/whyismyma...) with description of the problem and links to the possible solutions. Take a look at fourth solution - it’s free and you don’t have to run some unknow software on your mac. There is one disadvantage though, you have to redo it every time your system updates (few times a year).

"Laz - I've moved your stuff to its own question so others could see it. Lets see what others say here as well.

Here's a link to yours: MBP turns off Randomly Without Warning"

"Forget about the fans. Here is the cause, and cure:

https://realmacmods.com/product/macbook-..."

"Several good fix options in this thread: Randomly shuts down when not connected to an external display.

Two software fixes and two hardware fixes."