![]() Only when a microcontroller inside the charger detects that the charger is connected to a laptop does the charger switch to the full output power. Since the charger is rated at 14.85 volts, this may seem normal, but the behavior of a real charger is different.Ī Magsafe charger initially produces a low-current output of 3 to 6 volts, so shorting the output should not produce a spark. I measured 14.75 volts output and got a spark when I shorted the pins. The seams in a counterfeit Magsafe power supply are a bit asymmetrical.Ī problem showed up when I plugged in the charger and measured the output at the Magsafe connector.
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