No Screen output and logic board gets extremely hot while charging

Hi guys,

I recently purchased a iphone 6 with a cracked screen and no screen output. I was hoping that it was just going to require a new screen however that is not the case.

I have replaced the screen and there is no screen output , so i removed the logic board and put it into another iphone 6 which had all working parts however i still had no screen output.

When the phone is put onto charge the logic board gets extremely hot

Does anyone have any solutions or is this sounding more like a short on the logic board that is requiring micro soldering, i was contemplating giving the logic board a bath in ISOPROP but not sure if that will even make a difference

Any help is appreciated

Cheers community