Chosen Solution
I have an iPhone 6 motherboard and when it turns on the top portion of the board gets really hot right by the cpu and the screen is just stuck on the Apple logo. Anything I can do?
Sounds like is doing extra work, does it gets to DFU? And reset it
disconnect everything apart from the screen, battery and chargeport, flash through iTunes if its still in DFU then reconnect everything one by one until you find the faulty part, if you cant do this then its probably a board level repair.