Unfortunately, unlike the MacBooks, this model has the magsafe board integrated into the left I/O board which makes it a little more expensive. The board can be found right here:
..... and the installation guide right here:
You could also open up you Mac and check the connections between the I/O board and the logic board. Have you made sure that you are using a good adapter???
Hope this helps.
Includes MagSafe power, USB, and audio ports — 2 available at 99.95 each.