I’m having some curious heat issues with my new 3B+ USB ports.. IE, when I have one or no controllers plugged in, if I run my finger along the USB ports I get a hot zap, like an electrical tingle that’s a small bit painful, like it was very hot, but not gradual-computer-heat-hot, more like zappy hot.
Curiously, if the power adapter cable is pulled out and only the HDMI is plugged in, it still occurs for a little bit. If I pull the HDMI cable out (plugged to the TV and nothing else), and run my finger over the exposed plug end, I get the same feeling.
When multiple USB plugs are in, and I jam my fingers around the cracks, I don’t really feel it. Maybe because all the plugs block the ‘current’ (though putting in two or three plugs, and touching the third-fourth, does not cause the zap, maybe all the current is diverting to the right places?)
a) HDMI cables carry current? Should I feel the zap at the end like that, is my cable faulty? Is it the tv?
b) should the PI be carrying a zap all the way to the USB ports to the point where I feel it from the outside the case? Is this normal PI electrical conductivity?
c) is this zap going to burn something if it’s pressed up against fabric, ie, sofa, cushion…
d) my supplier is happy to return and exchange, but I’d rather not if it’s 1-normal ? 2- the cable rather than the pi… what’s the course of action here? Can some kind people jam their fingers around the USB ports when the HDMI / power and 1 or 0 USB controller(s) are plugged in and tell me what's normal?