Why is my phone can not open up when i typed in the right pass code?

[AC Question]

I dropped my phn (Samsung Galaxy J1) & it went off by itself so when I turned it on again and tried to enter the pin code but I doesn't open up !! It just went back off just like that - even if I turned on the flashlight it's the same thing, it goes off while the flashlight is still on
What can I do about it ? Help

 

[belodion]

Perhaps the impact did damage.