My friend gave me his COV mini volt box mod.When I attached my atomiser to it and press the fire button it showed no atomiser.I Google about it and it said there should something qrong with the 510 connection.So,I remove the board from the case and noticed that the wire connected to the base of 510 was plugged.I attached it and switch on,it was fine.After I put in case and try,the problem start.It was soldered before but I didn't do it.