Chosen Solution
My Macbook won’t charge after replacing the battery and charger. My warranty is up and I don’t have the money to send it in to be fixed. When I plug charger in, the light on the charger doesn’t turn on. Sometimes if the charger is in perfect position it will charge for a few seconds and then the light will go off again. Any help would be useful.
Use a toothpick and move the pins in and out on the Power Adapter..Next use a multimeter to test the output of the pins and see if you get 16.5 volts. On the right of this wiki is a picture of the pin out: http://en.wikipedia.org/wiki/MagSafe Next replace the Mag=safe board, here’s how: MacBook Pro 13" Unibody Mid 2010 DC-In Board Replacement
If you look in that picture you will see a very thin white gasket around the pins. I had same problem and it turned out for me it was just the insulating gasket in the external port. I found part of it still intact and guessed partial insulation might be that causing a short. The gasket is made of very thin tape and sure enough when I made a copy and put that in, it charged fine on the new charger I had bought. The old charger is dead (on this and a friend’s machine) so I presume it was fried shorting while I repeatedly tried to charge before. P.S. I made the copy of the gasket size needed by making an inverse template by pressing Blutac into the magsafe port hole and used that as a block to print an outline onto the tape. For me I didn’t even need to open the mac up!
