/diy/ - Do It Yourself

I've been using this Raspberry Pi powered lapdock for about a month and it's working great, Then out of the blue after turning it on, nothing happens. Pressing the button on the lapdock does nothing, when normally it should reveal it's battery level. I notice the distinct smell of magic smoke. I think I just fried it.

Not sure how it happened but I think it's because power backflows through the USB ports that's used to connect the keyboard/mouse to the Pi. I think it overloaded it somehow when the Pi tried to draw too much power. How do I go about diagnosing the broken component and replacing it?

my motorola lapdock + pi
not much of a build but a handy little thing to have.