This answer from Jose on the ifixit N5 teardown page offers even better detail on where to reconnect the Qi wireless charging connector. "Make sure to press not only the side tabs back in place when putting it back together but the middle also. I put mine back together and my wireless charging stopped working. Once I ran my fingers through the middle of the phone in a pressing motion moving from bottom and working my way up, I heard a click and then the wireless charging started working again. You will notice if that tab is not in all the way because the back bubbles and if you poke it you see it give a little." I discovered the click happened in the middle of the phone right below where the camera lens is. Desmontaje del Nexus 5