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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:

  1. I cleaned everything a couple of times with finger nails and a wooden toothpick (to prevent scratching: electric stuff doesn't like metal fragments).
  2. The connector kept getting hot.
  3. 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.

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It is broken and will die a horrible dead soon :) actually it should be RT like all the time. Check the pins to see if one of them is getting discolored. – Buscar웃 Feb 27 '14 at 16:17
RT= room temperature :), the only reson for it to get hot is a bad contact creating a arc, that creates heat. – Buscar웃 Feb 27 '14 at 16:54
OK, if it is not hot by now then it worked ! – Buscar웃 Feb 27 '14 at 17:28
I would call that one solved. Getting a new plug might be a good idea. – Buscar웃 Feb 27 '14 at 17:34
chat did not work for me, sorry have to go and make dinner :) – Buscar웃 Feb 27 '14 at 17:55
up vote 2 down vote accepted

Actually it should be RT (room temperature) like all the time.

Check the pins to see if one of them is getting discolored.

The only reson for your converter to get hot is a bad contact creating a arc, that creates heat.

Making sure the plugs sit tight (on both sides) and that none of the contact pins (on both sides) is discolored. Cleaning the pins could not harm.

Ultimately getting a new converter would be a good idea.

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Try disconnecting the adapter from the plug and rotating it 180 degrees. Not sure why it works, but it works.

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Strange, but it worked, but not as good as cleaning the contacts. – Jeroen Wiert Pluimers Feb 10 '15 at 17:42

I've had my MacBook Air 11" for over three years and just today the magsafe L got hot which is why Im even on this thread. I turned my block plus 180 degrees in the same outlet and it stayed cool, I moved it one outlet over it got hot again, I changed to yet a third outlet and it stayed cool. Im no electricity guru but In guessing its the outlet and not my charging unit. I read a few other threads in other places and some say theirs have always been hot and that its normal, I disagree, its not normal to have anything on your computer too hot to touch. Thanks for the ideas, they worked for me.

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We appreciate your input, but the answer would be better if you had more definitive backup. You're welcome to run enough experiments to be able to cite your experience as a source for a definite solution, but if you have to preface your answer with "I'm guessing", there's room for improvement. – user24601 Dec 22 '14 at 23:33
Answers that are speculation and offer no corroborating support here attract down votes. I suggest either finding some source to offset your lack of "electrical guru"-ness or deleting this. – Ian C. Dec 22 '14 at 23:48

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