Hi Thomas,
My First Question - How did you repair the Charging port on the board. Are you a technician. If yes Then Probably You need to check the Voltage with the help of Multi meter to see the power in the board. Then its a board level issue.
If you are not a techinican, I recommend Checking all the flex cable again and the Battery Connector to see whether they are inserted properly and Also the Charging port as well. Everything looks fine then probably you might have to see a Repair techinican who can fix it.
Regards,
Sahil