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mafix mafix
mafix mafix
Associate II
July 21, 2017
Solved

I connected the +5v pin to the ground pin by mistake

  • July 21, 2017
  • 5 replies
  • 1118 views
Posted on July 21, 2017 at 12:02

i have stm32l152c- discovery board. i connected the 

+5v pin to the ground pin and now it seems work on very low power mode and ld1 not lit up and ld2 , ld3 and ld4 lit up very weak. pc not recognize the board. what can i do?

    This topic has been closed for replies.
    Best answer by Vangelis Fortounas
    Posted on July 24, 2017 at 15:44

    .Hi again

    By my mistake  i gave you wrong information   about  152 NUCLEO i have in my desk and Not for discovery board!!

    In discovery case  I just checked the schematic  and the most posible is to have malfuction is the D1 diode.

    Sorry  for the dissruption!

    .

    5 replies

    Vangelis Fortounas
    Vangelis Fortounas
    Associate II
    July 22, 2017
    Posted on July 22, 2017 at 17:12

    Hello

    Check your PC usb ports if work normaly.

    Remove JP5 and see if your  computer recognizes the stlink

    If not,  check D2 shotky diode

    In case is not working (D2) you did not just touch the +5v pin to ground.

    replace it  (can use temporarily an ordinary silicon diode) and see if the stlink works.

    regards

    vf

    Vangelis Fortounas
    Vangelis Fortounas
    Associate II
    July 22, 2017
    Posted on July 22, 2017 at 17:21

    I forgot to write that you have also the option to feed the board from VIN  pin. Read the manual about the voltage you must provide.

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