Macbook pro 2015 how to treat?

Question

macOS

MacBook pro 2015 fell ill sharply. What to do? At one fine moment, the sum itself appeared a notification to turn off the computer, and it turned itself off. After which it became cut down when turned on,!
Shift on power up helps the situation but going into safe I never let go of shift for only a short time. As soon as releasing after a few seconds, it abruptly turns off as if with some kind of click ...
And the sound disappeared abruptly when turned on ... The keyboard does not light up. And it turns off if you do not press any button .. could there be a problem in the keyboard or what else ???

Answer 1

https://youtu.be/XIB4KvSHW1E
Here is a link to a video of how he behaves
D does not give any diagnostic errors at all
....
RESULT: I changed the backlight of the keyboard and the keyboard itself :) issue price 1600 r

Answer 2

Run to service

Answer 3

I think the poppy is flooded. The power button closes the kl-ra, well, you need to look whether it got on the board. It is better not to use it, do not charge it, do not turn it on, if possible, remove the bottom cover and disconnect the battery. Take it in for service, the sooner the better. If you are in Moscow, you can bring it to me , diagnostics are free.