Skip to main content
ufix10
ufix10
Associate
August 1, 2013
Question

No reaction after plugging board via usb to PC

  • August 1, 2013
  • 2 replies
  • 678 views
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
    This topic has been closed for replies.

    2 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    August 1, 2013
    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.

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    ufix10
    ufix10Author
    Associate
    August 1, 2013
    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. 

    Terms & ConditionsAccessibility statement