"Bang" refers to the sound of electric ignition. You should carefully check whether the sound is coming from the chassis. If it comes from the chassis, it is mostly related to the power supply. This kind of problem is relatively rare. If it is not from the chassis, please carefully check whether the reed in your power plug-in board is loose. This kind of electric shock is very common. Check all the places where the chassis display has a power socket to confirm where the sound source is.