Assembled unit. Attached lead to input side. Attached 20v tool battery into lead. Display didn’t come on at all. Please help. Is this DOA? Amazon description – DROK DC Buck Module, Adjustable Buck Converter Step Down Voltage Regulator 6V-32V 30V 24V 12V to 1.5-32V 5V 5A LCD Power Supply Volt Reducer Transformer Module Board with USB Port Protective Case
Manufacturer number: 180080AFA