Apple Magsafe PSU repair/replacement

Discussion in 'General Electronics Chat' started by davidc, Feb 20, 2010.

  1. davidc

    Thread Starter Member

    Jul 2, 2009
    The power supply unit for my Macbook (known as ) failed recently.
    It delivers a 16.5 V 3.5 A output.
    One of these is almost 100 euro new, and my laptop is out of warranty.

    I was thinking of putting together a replacement myself, but thought it would be wise to ask for some advice beforehand.
    I can put together a 16.5 V PSU no problem - although a transformer which can handle that current will be expensive.
    On the other hand, trying to repair the old one involves opening up the case - which will be tricky.

    As far as I know, the control circuit which switches off the supply when the battery is full - the brains of the device so to speak - is located inside the 5-pin connector at the end which connects to the computer.[1]
    If this is not the problem with my Magsafe (and I'm hoping it isn't - my suspicion is that the problem with my Magsafe is at the wall-side of the device), then this might be doable.

    If anyone has any advice or suggestions they are welcome.
    It's not the end of the world if I have to buy a new one, but I'd prefer to explore other options first.

    [1] See
    Last edited: Feb 20, 2010