Xbox Elite Series 2 Help

I watched a video about the xbox elite series 2 you guys posted on youtube and felt confident in buying my friends controller from him that had a broken analog to try to fix it. I successfully fixed the analog. But now the a,x,y and b buttons nor the diagnol pad work. Ive tried checking the blue board, lining up the pads. My home button light isnt turning on. But the controller comes up on my xbox. Need some help figuring this out guys.