Chosen Solution

About three years ago, I bought a second hand xbox one, and i love it, aside from the fact it will nit sync with a controller. The button works, as i can hear the noise, and sometimes it powers off my console entirely! I have taken it apart a few times, and sometimes when i put it back together my controller will sync to the xbox, but then disconnect and not reconnect. So Im not sure if this is due to the wifi card or the rf board. Could someone help me out?

If the controllers are not connecting, it is most likely the RF board that needs to be replaced.