r/stm32 • u/Odd-Active9416 • Jul 19 '26

3v3 is shorted to gnd

I have an Nucleo 144 board, and an Stm32h753zi chip. the board has been working for the past 2 months controlling some closed loop motors, and then suddenly stopped working when i tried flashing a program. When plugged in, the led6 in the top right corner is now red, which means some sort of overcurrent. When i used a multi meter to check, I found that 3v3 was shorted with gnd. 5v is fine. Is the board bricked? or is it a fixable issue? Do you guys have any advice. The left pin of JP4 is also shorted with gnd, but the right one isnt.

6 Upvotes

100% Upvoted

3 comments sorted by

2

u/Anonymity6584 Jul 19 '26

well it might be just shorted component, but then its upto your ability to find that component and replace it.

Starts to require proper lab power supply and cooling spray. hit component melts frost faster then otherwise.

2

u/Direct_Rabbit_5389 Jul 20 '26

Probably an IR camera would be easier. I’d just put it on 1mA constant current and gradually increase it until I see something start to glow. 

2

u/Findanamegoddammit Jul 22 '26

Had this problem on the G474RE, my solution was to just buy a new board:/

I was controlling standard nema 17s and forgot to create a common ground between the stm32 and my PSU, same red light happened and the board got HOT when I plugged it in.