Screen dead and getting hot after connecting the battery
i had a very bad luck with my iphone SE which jumped out of my trousers right into the closing doors of my car.
The result of that was slightly bent back side of the phone with no visible damage to the screen or anything other than the back side. The phone seemed to work without any problems so i thought i had more luck than expected after such accident. I tried to bend it back just a bit which quite worked and everything looked fine.
Then after approximately two weeks without any other impact, i took my phone from the pocket, unlocked it, did few touches on the screen and the screen died. The phone looked like it was still working (it was vibrating when moving the vibrate/ring switch), so i tried to reset the phone without any luck (the phone seemed it did the reset but the screen was still not working so i haven't seen it).
Then i tried to charge the phone and it got really hot. So i unplugged it and disassembled it to disconnect the battery and check if the screen cables were attached properly. Everything seemed fine, i have just tried to disconnect and connect all the cables to see if it will make any change.
After assembling the phone, i have turned it on - it started but without the screen working, but it also was getting hot even without being connected to the charger. So i unplugged the battery once again. After a while, i tried to connect it back but i didn't turn the phone on - but it was still getting hot (the source of the heat was somewhere under the place where the screen cables connect).
Last chance - i tried to assemble the phone and connect it to the computer before it started to get really hot - it looks like it wants to communicate with the computer, it also played the charging chime but the phone is locked with the code which i cant enter because the screen is not working so i can't see if the phone itself works.
My first thought was that the screen died - i can still try it with a 5S screen from my wife's phone. But why is it getting hot (from the A9 chip from the placement i guess) even when it's not powered on, only connected to the battery? Can the logic board be damaged, even if it still seems to boot the phone, vibrate, play the charging sound and try to connect to the computer?
Thanks for any help.