MacBook Pro exposed to reverse current

Ok, so, my Macbook charger Magsafe 1 60w started having problems (the magnetic part separated from the head of the charger, it started sparking and it worked putting the piece back in place till I lost the magnetic part. In that moment the Macbook was still working till the battery drained out) so I decided to change the cable. I opened the Magsafe and I found two soldering points where was the cables. I replaced the old cable with a new one, but when I soldered the cables, I soldered the white cable where I must have soldered the black one exposing my Macbook to inverse current. I connected the charger to the wall and my Macbook didn't charged and the Magsafe Led didn't switched on. I started hearing weird sounds coming from the Magsafe circuits and I dissconnected the charger. Then I realized my mistake but I just decided to buy a new Magsafe charger. When I connected the Magsafe, LED didn't switched on, didn't charged and my Macbook still unusable. I want to know: is there any protection like rectifiers inside the Macbook's DC Power In? If there aren't my Macbook's Logic Board is dead? Should I change the DC Power In module? I has seen the Magsafe Board (Macbook's DC In) and it seems like there is some kind of SCR or MOSFET burnt. The logic board seems to be ok.. Thank you very much.