I've blown U1 on two Esquilo's. I switched to a 12v power adapter because I needed more volts for another part of my heater control circuit and unknowing to me it was putting out 17.17v.
Looks like the pads are blown off but the second one doesn't look so bad. I tried powering the first one with USB and it looked like it connected to the WiFi so if not repairable I'll try that way. I may even put a 9 or 12v regulator before the power gets to the Esquilo. And double check the power brick I'm using.
Used a cheap usb microscope to take picture.