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External alimentation

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Hello, I'm new to the world of PIN2DMD. I set up my Stm32f4 card and everything is OK. I put my license on an SD card. When I plug my stm32f4 into USB on the PC it's OK. If I plug the card into an external USB power supply it is KO. If I plug the card into an external 5v power supply It is also KO. Do you have any idea? Oh yes, I use a PCB from germangaming

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