Inspiron 15 7000 Series 7559 Motherboard replacement

It appears that my laptop requires a replacement motherboard. A few days ago, it began a boot loop where it would go to the dell screen, then reboot over and over again. I tried doing F12, but even when that screen comes up, once a certain amount of time has passed in that iteration of the loop, it restarts no matter what. We unplugged both the battery and the hard drive to only use AC adapter power, and the boot loop persisted, so that's how we reached the conclusion that the motherboard was the problem. I was wondering if anyone knows where i can get a replacement? I couldn't seem to find replacements of the website.