@alex67421 first you want to rule out a bad battery. That would be my first step. Next I would consider checking the ribbon cable coming from the daughter board. Those have a tendency of either coming loose or failing. Consider replacing that. After that would be the daughter board itself. Samsung refers to those as PBA in their manuals. Again, replace it. If that still will not work, you need to check your circuit board. Here are the instructions on the disassembly of your phone [document|29100]
Let us know how it works out.