Fans at maximum speed + battery issue after fixing "not turning on" problem

[yuumcha]

Hi,

A week ago, my MacBook Pro (Retina, 15-inch, Early 2013) suddenly stopped working: it would not turn on when pressing the power button. After trying solutions as SMC and PRAM reset, it was still impossible to turn it on. So I tried to open my MacBook, disconnected my battery, then I pressed a long time on the power button and it solved the problem: it was working again!
…But new problems have appeared:
1) Now the fans of the laptop is at maximum speed after booting even though no application is launched (no high %CPU usage in app monitor and the temperature of the MacBook components seems to be normal as well). Again, I tried SMC and PRAM reset but no results. I noticed that after an update of the system, the fans were stabilized again until I restarted the Mac: the fans were going crazy again.
I feel like I activated a mode in which the fans run at full speed like in this post
https://support.apple.com/en-sg/HT204463
because I may have done something similar (pressing the power button when connecting back the battery of my laptop).
2) The battery is now discharging even when the MacBook is off.

Has anybody had the same issues before and/or has any idea on how to solve it?

Thank you

 

[ETechMaster2002]

I've had this issue with my 2016 MacBook Pro, in fact, exactly 2 days ago I got it back from AppleCare. In fact, I feel like I'm looking at a exact replica of my issue.

You have to send your Mac in for repair via an Apple Store or Apple Care. It's a hardware issue. Your logic board has developed an issue and need it replaced, both fans need to be replaced, battery needs to be replaced and maybe your I/O board (they did with mine).

Note, that they reinstalled macOS on my MacBook Pro. Therefore BACK UP ALL OF YOUR DATA before sending in or bringing in your MacBook Pro Also, my MacBook Pro is under warranty. I'm not sure if you purchased Apple Care with your MacBook Pro. Therefore, there might be a cost to your repair.

Spoiler: My Apple Care Repair Notes