Wireless Charging not working

I recently bought a Galaxy Note 5 that needed the screen repaired. After getting the phone apart, I ended up having to replace the motherboard as well. After replacing that and getting a new screen on it, it was working great. I have a few issues with the S-Pen, but overall, it works great. However, after buying a wireless charging pad, I couldn't get it to work. I verified and tried every position I could. I tried booting the phone in safe mode. I even took the phone apart again and verified there was nothing on the contacts for the wireless coils inside the phone's frame. Nothing seemed to work. However my girlfriend's Note 5 charges perfectly on this wireless pad. Any suggestions? Some setting that I missed?