No reaction after plugging board via usb to PC

[ufix10]

Posted on August 01, 2013 at 13:52

Hi, I have tried to measure the real output voltage on 5V pins so I'd know for sure I won't burn my servo, but after doing so all LEDs went of, nothing happens after connecting board to USB and now on the 5v pin I have 2V output not 4,7V as I measured it earlier. I'm pretty sure the board is gone, but I want some assurance. Maybe there is something I can do?

UPDATE: I have no idea what I have done, but empowering the board via usb doesn't work, but when I enpower the board with external source battery it works and when I plug it to the computer, port COM is ON and communication is fine. Any ideas?

#broken-failure-stopped-working

[Tesla DeLorean]

Posted on August 01, 2013 at 17:18

What board exactly are we talking about, there are like 6 different series of Discovery boards?

Get the schematic for your board, and review any regulators/diodes in the 5V path from the USB connector. Have you blown out a USB port, try another one.

[ufix10]

Posted on August 01, 2013 at 18:06

It's a STM32F4. Thank you for your answer, I have just downlaoded schematics(haven't found such earlier) and now I can investigate on my own.