So. I think this has less to do with the wattage of the chargers, or more to do with the actual connectors on the charger. This sort of issue can be caused by certain pins not totally depressing, or making full contact. What happens is that the pins in the Magsafe charger are close enough to the ones on the board connector that electricity arcs across the tiny gap. That's why the pins char. And also why it gets hot. Pins 2 and 4 are always the ones that do this.
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So. I think this has less to do with the wattage of the chargers, and more to do with the actual connectors on the charger (and your MacBook). This sort of issue can be caused by certain pins not totally depressing, or making full contact. What happens is that the pins in the Magsafe charger are close enough to the ones on the board connector that electricity arcs across the tiny gap. That's why the pins char. And also why it gets hot. Pins 2 and 4 are always the ones that do this.
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It's possible your colleague's charger happened to conform better to the pins on your MacBook.
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It's possible your colleague's charger happened to conform better to the pins on your MacBook.[br]
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It's also possible that some damage has occurred to the charging circuitry on the logic board. Higher power throughput could introduce this failure where a lower wattage allows for normal function.
So. I think this has less to do with the wattage of the chargers, or more to do with the actual connectors on the charger. This sort of issue can be caused by certain pins not totally depressing, or making full contact. What happens is that the pins in the Magsafe charger are close enough to the ones on the board connector that electricity arcs across the tiny gap. That's why the pins char. And also why it gets hot. Pins 2 and 4 are always the ones that do this.
It's possible your colleague's charger happened to conform better to the pins on your MacBook.