Possible logic board failure on iPhone 6 Plus

Randomly this evening my iPhone 6 Plus decided to end its existence in some sense. It was working perfectly fine prior to me going outside for a smoke. I came back inside and the screen had gone black and the back light was turning on and off repeatedly. I initiated a hard reset because the power button was not responsive and after that there was nothing. I plugged it into my PC to see if anything could be done in iTunes but it required me to enter the password from the phone that was dead. I tried forcing it into recovery mode but that needed a password as well. The phone obviously turns on and off when using the hard reset but nothing works. The vibrate switch is unresponsive as well. Touch ID to unlock the phone doesn't work because the PIN needs to be entered when the phone is turned back on. Wondering what you guys think these symptoms add up to. Feedback will be much appreciated. Also the phone was in perfect condition previous the this, and I have had it since the first day it was released. EDIT: Right now just trying to let the battery drain to see if I can revive it with a fresh charge (wishful thinking I know) I am now noticing there is a pretty warm spot on the phone just under the camera