09-08-2020, 01:23 AM
I've seen some blown Thunderbolt ports which may have been from using 3rd party chargers/cables. (In the 15-inch and 16-inch, those may be repairable without a full logic board swap. Potentially big bucks on a 13-inch.)
I suspect that they're sparking when the Mac is plugged into the cable/adapter before the adapter is plugged into wall-power. Not a lot of evidence behind this. Might be something else altogether, perhaps manufacturing defects by Apple.
Just to be on the safe side, I suggest plugging in the adapter to wall-power before plugging the power-cord into the Mac.
I suspect that they're sparking when the Mac is plugged into the cable/adapter before the adapter is plugged into wall-power. Not a lot of evidence behind this. Might be something else altogether, perhaps manufacturing defects by Apple.
Just to be on the safe side, I suggest plugging in the adapter to wall-power before plugging the power-cord into the Mac.