iPhone 6 dead & iPhone 6s heat.

My iPhone 6 was dropped from 4th floor, the screen was not in a condition to get prepare and the remaining body was totally bend. but iPhone was in working condition. I replaced the body of iPhone with a new display, and it was working perfectly except home button and finger print. i replaced the strip which is coming from that steel plate behind the display. after every thing fixed i tried to turn on the iPhone but it was not turning on.

I recently replaced my iPhone 6s body. after replacing my iPhone started heating very badly even in turnoff state. i purchased that iPhone from UAE and the body replaced in INDIA. its turning on but it heats like a burning coal. hence i have removed battery from it. is there any solution for this.