The next step in the troubleshooting process would be to try and replace the magsafe port, if you indeed know its not the physical charger itself. This sits between your logic board and charger. If you are noticing slow charges and have eliminated the possibility of having a bad charger, it's possible your magsafe port is showing signs of its age. If I am not mistaken [http://www.ebay.com/itm/MAGSAFE-DC-POWER-BOARD-Apple-MacBook-Pro-Unibody-15-A1286-2009-2010-2011-2012-/301785620320?hash=item4643d31f60:g:5tsAAOSwdzVXp8ZY|this] is the part you should be looking for.
The next step in the troubleshooting process would be to try and replace the magsafe charger. This sits between your logic board and charger. If you are noticing slow charges, its possible your magsafe port is showing signs of its age. If I am not mistaken [http://www.ebay.com/itm/MAGSAFE-DC-POWER-BOARD-Apple-MacBook-Pro-Unibody-15-A1286-2009-2010-2011-2012-/301785620320?hash=item4643d31f60:g:5tsAAOSwdzVXp8ZY|this] is the part you should be looking for.
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The next step in the troubleshooting process would be to try and replace the magsafe port, if you indeed know its not the physical charger itself. This sits between your logic board and charger. If you are noticing slow charges and have eliminated the possibility of having a bad charger, it's possible your magsafe port is showing signs of its age. If I am not mistaken [http://www.ebay.com/itm/MAGSAFE-DC-POWER-BOARD-Apple-MacBook-Pro-Unibody-15-A1286-2009-2010-2011-2012-/301785620320?hash=item4643d31f60:g:5tsAAOSwdzVXp8ZY|this] is the part you should be looking for.
The next step in the troubleshooting process would be to try and replace the magsafe charger. This sits between your logic board and charger. If you are noticing slow charges, its possible your magsafe port is showing signs of its age. If I am not mistaken [http://www.ebay.com/itm/MAGSAFE-DC-POWER-BOARD-Apple-MacBook-Pro-Unibody-15-A1286-2009-2010-2011-2012-/301785620320?hash=item4643d31f60:g:5tsAAOSwdzVXp8ZY|this] is the part you should be looking for.