iPhone 5s won't turn on + red screen

I tried to open my phone, but it didn't work, it was just restarting or didn't turn on at all. After some time it comes back but not for too long. After few times this happened, I've got red screen of death. Didn't do anything with phone, just holding it in hand and red screen. After some time, again, it's normal. Yesterday again, it was stuck on apple logo and kept restarting so I googled my problem and saw videos saying I should put pressure with my fingers on right up corner of phone where display connectors are, so I did that and slowly moved fingers down. After pressuring somewhere around middle, again, red screen. "LET'S FIX IT" -I said to myself and opened the phone, saw video saying I should try to put pressure directly on display conncetors, because they can be disconnected, so I did that, "MAYBE IT's BATTERY PROBLEM" - so I tried to unplug the battery but spark appeared, my heart almost stopped so I closed iPhone and nothing changed, just black screen as it was before. Today I took my phone, tried to turn it on and it showed logo when batters is low battery, now it's charging from pc and still has black screen.

I've tried many combinations of home button + power button but none helps