No, I don't have anything like that on hand. However I would suspect if the electrical system at my place was improper I would see other devices malfunctioning or getting damaged. Apart from the typical household appliances, I have the usual battery of electronics at my place, a router, a modem, several wifi access points, PCs, laptops, TVs, TV boxes etc. Never had a problem with anything. The U5 is the only thing misbehaving.
I was able to test the voltage on the outlets and the power supply, both of which check out. 227v and 12.58v respectively.
I also tested the U5 with a different TV, in another room using a different outlet, (replacing a working 12v Android box) with no change in behavior. Still goes into a bootloop.
Actually the U5 doesn't even have to be connected to a TV, you can tell it's in a bootloop looking at the indicator light on the front. Goes red after after 30 or so seconds. It does eventually boots to the launcher but then will reboot again after a random period of time.