Self-powering a bus-powered USB device?
February 20, 2008 2:58 PM Subscribe
Anyone ever managed to power a USB flash drive independent of the bus-power?
I am examining it for a friend of a friend. Their usual IT support channels threw up hands and pronounced it dead. I am the last-ditch measure they passed on to because I see this sort of thing as part challenge and part playground.
When connected to known good USB ports, the LED does not light and the device does not appear on the USB bus at all.
It was pried out of its rubber casing when I received it; I have examined the circuit board and see none of the black craters I usually associate with power issues on circuit boards. I was thinking about hooking up a +5V DC power source to the power pin past the USB connector, probably with an alligator clip or small wire, to see if I can eliminate the connector itself as the source of the problem.
I would, of course, block the pin on the USB connector to prevent it from damaging that part of the USB. I figure I'd use a cheap USB male-female extension cord, cut the power wire, then toss or "repurpose" when I'm done with this.
Am I totally off base here? I'd love a better idea that I hadn't thought of, preferably not requiring too many specialized parts.