I have the fix for you. I had the exact same issue: This video on youtube will help you navigate what I'm telling you to do. This is a battery swap but he does everything i'm about to tell you to do. !!!!! Wouldn't let my post the link but youtube samsung galaxy note pro 12.2 battery swap he has a tutorial.
a. I swapped out the Charging Port $12.00 on eBay, no need for you to do that
b. Open the device and unplug the charging port connector, be careful not to brake the tab which flips up
c. Unplug the battery from the connector where it goes from battery to board, also be sure not to brake this on, it also flips up
d. Unplug the battery from the main board. Gently lift up from where the wires are, the white section will lift up leaving the black dock
e. plug all components back it.
f. plug the tab in and it should come to life, mine did
g. level of difficulty on this task is about a 2/10 any dude/dudette could do this.