An unexpected behaviour and Display turned off

I installed Deus ex GO game from the AppStore and suddenly display is dead I tried to do all things hard reboot etc etc But the iPhone’s Display wont turn on suddenly it stared heating where display ribbons are connected later I took the screw driver and removed the Display and because the phone was heating for no reason i disconnected battery cable from the logic board and when i connect the battery cable to the logic board it again started heating in 2-3 seconds .