Author Topic: Macbook Air power supply - unreliable charging  (Read 1074 times)

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Offline salil

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Macbook Air power supply - unreliable charging
« on: January 24, 2015, 01:10:18 pm »
I soldered a genuine magsafe1 connector to a 15v/3A DC Toshiba power supply I had lying around in an effort to have a cheap 2nd power supply for my Macbook Air 11" 2013.  I'm also using an Apple magsafe 1 > 2 adapter to make this work.  I've been using it for a couple months and usually it works, but sometimes I get the message "not charging" in the OS X status bar despite the power supply being connected.  Usually plugging and unplugging the power supply a couple times fixes this (sometimes I also have to unplug the power supply from the mains).

The bigger problem is that sometimes I'll need to leave my Macbook plugged in and running while I'm not there, only to find the battery is completely drained when I come back.

The LED on the magsafe1 connector is erratic in behavior, it frequently doesn't shut off when I unplug it from the Macbook.  I've heard of people having this same issue with the official Apple magsafe2 power supplies but I haven't run into any issues with mine.  I tried cleaning all related connector contacts with no change in symptoms.  Does anyone know what's going on here?  Any help is greatly appreciated.
« Last Edit: January 24, 2015, 01:12:39 pm by salil »
 

Offline peter.mitchell

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Re: Macbook Air power supply - unreliable charging
« Reply #1 on: January 24, 2015, 01:16:43 pm »
the macbook won't charge unless it's less that 96% charged, also, if there is excessive ripple or voltage sag it won't either.
 

Offline salil

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Re: Macbook Air power supply - unreliable charging
« Reply #2 on: January 24, 2015, 01:28:02 pm »
the macbook won't charge unless it's less that 96% charged, also, if there is excessive ripple or voltage sag it won't either.

Thanks, I've encountered this problem at a variety of charge levels.  Last time I did it was around 20% charge. I haven't checked the power supply for ripple or sag as I don't have an oscilloscope handy, but the Toshiba power supply was originally for a (different) laptop, so I would think it would provide clean enough power?
 

Offline peter.mitchell

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Re: Macbook Air power supply - unreliable charging
« Reply #3 on: January 24, 2015, 02:15:57 pm »
yeah, should be clean enough, they are fairly tolerant, i'd double check your soldering.
 


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