Out of nothing, my MagSafe to MagSafe2 converter became extremely hot while charging. So hot, I could not even touch it.
What could cause it?
I've been using it so I can leave multiple old 85W MagSafe chargers at various places, so I plug my new late 2013 15" Retina MacBook Pro without having to bring a charger.
After inspecting for discoloured parts, I saw the flat side of the aluminium surface is a bit discoloured.
This is what I've done after it got hot:
- I cleaned everything a couple of times with finger nails and a wooden toothpick (to prevent scratching: electric stuff doesn't like metal fragments).
- The connector kept getting hot.
- After turning the connector 180 degrees, it kept cold. If I turned the power plug 180 degrees or 360 degrees, it stays cool too.
I presume it is for a new converter.