I finally found the solution to the problem. I was checking the output voltage of the charger. and although it was 4.2 seemed not to charge the batteries. I turned the LED, because it was returning green when the battery was low voltage. But this did not work for nothing ... the charger still did not load. So I resoldered all the components of the charger board.And in the end it worked!.
I hope you like my experience of something. because send the charger to Fasttech was a very expensive option.
Edited on 10/21/2013 at 3:56 PM. Reason: