Hello, I recently purchased several of the DFRobot ledkeypad shields: 7 Segment LED Keypad Shield For Arduino - DFRobot
I have Arduino Leonardo (which also had some problems in the beginning, being recognized as modems).
Some shields worked fine but I am now having trouble with one of them, which seems unresponsive. I can load for instance the blink program in the arduino, but the shield does not work. When it is plugged in, the fours dots are slightly red, and I cannot turn them off. I didn't manage to get anything else out of it.
Is there anything I can attempt to fix the problem ?