You can check if the on-board regulator's working by seeing what voltage appears on the Vcc pin when the Vin pin is
supplied with power - and check if Vin is at the expected voltage too (not shorted).
You can check if the on-board regulator's working by seeing what voltage appears on the Vcc pin when the Vin pin is
supplied with power - and check if Vin is at the expected voltage too (not shorted).