How do you know that your charger is faulty?

If the light is not coming on the laptop charger, your charger is faulty.If your charger wire is frayed the it needs to be replaced or else the wires inside will short and cause the motherboard to get dead.We have to check the charger with a multi-meter.Magsafe chargers are repairable.Other chargers are not repairable, we have to replace them.