My wife ordered a new adapter for her 2013 Mac Air Model A1466, Amazon sent the wrong one and we did not notice because the mag fit perfectly and it appeared to charge. This seemed to charge fine for a couple weeks, but last night it went totally dead. When I press the power button, there is absolutely no reaction--it does not matter whether it is plugged in or not.
When first connecting the charger, it appears green for a few seconds and then orange and never goes back to green no matter how long it's plugged in (13 hours charging overnight and no response when pressing the ON button).
When examining things this morning, I discovered that the Mac Air is rated for "14.85V 3.05A Max" and the Charger's output is rated at 20V 4.25A. I understand that an overpowered amperage is fine--no problem--the device will take what it needs: But overpowered voltage is critical and will fry your device!
My question is . . . what protective mechanism or circuit does Apple use to prevent the motherboard from being fried? Do you have a diagram or name of the replacement part? Any description where it is located would be helpful as I looked and could not readily recognize the circuit inside. Thanks in advance.