I've been having problems finding a good 2A+ power supply around the house that would stay above 5 volts but no dice. So I gave up and tried powering from a bench power supply to a variable dc-dc step down. I powered it over the GPIO 5v and ground found it started drawing 3.5 amps. So I moved to powering over the micro USB port and it did the same thing but this I felt the power supply area on the RPi and found that the D5 a SMB5.0A device (Datasheet PDF) was very hot and let off a bit of smoke. Can I just replace this guy or are there other problems that I have to look out for?
Raspberry Pi 3 B v1.2 schematic - link broken