Re: USB cable starts overheating when Power Supply is turned on

New problem: LED doesn't turn on anymore, Sanguino broken now?


Ok turned out the polarity of the power supply wasn't right. So I turned it around and everything worked without overheating USB cable.

I could connect with the Sanguinololu board but couldn't move the motors. After some 20 minutes of looking what I could've done wrong I decided to turn off the power supply and see if I could connect with the board just using usb. And then the trouble started, the light on the Sanguino wouldn't light up anymore and when I re-attached the power supply, nothing happened either.

So I took off the power supply again and tried a reboot of my computer, after that I reconnected the USB cable and still nothing happened, I noticed that the USB cable was getting warm now, not hot, but warm.

I feel like it's all broken now and I have no idea how and why. I have a moderate understanding of mechanics and science and cannot understand what could've possibly gone wrong.

Are there things I can check with my multimeter on the board to see it everything is still working right? :(