STM32F4Discovery not working without external power?

[eraycanli]

Posted on November 23, 2012 at 14:34

hello,

my stm32f4discovery board started not working without connecting external 0-5V power supply to GND and 5V pins.

when i plug usb only, nothing happens, none of the leds light. if i connect external power additionally, it connects to pc and i can even programme mcu.

all of this happened after shorting two pins unintentionally while making connections.

how can i solve this problem?

thanks.

#stm32f4discovery #power

[Tesla DeLorean]

Posted on November 23, 2012 at 15:15

how can i solve this problem?

Figure out which parts in the power supply path you have destroyed and replace them. Get the schematic and a multi-meter/scope.

[eraycanli]

Posted on November 23, 2012 at 15:19

which parts are related with power on Discovery board? does it include something like a fuse?

[Tesla DeLorean]

Posted on November 23, 2012 at 16:29

which parts are related with power on Discovery board? does it include something like a fuse?

Do you see a fuse in the schematic? I'd look at D1 as the first candidate for silicon evaporative protection.

Here's the schematic/manual if you're having a hard time finding it.

http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/USER_MANUAL/DM00039084.pdf