Original post by: Owen Cunneely ,
Problem solved, it was this piece. I took one from a broken iPad 2 LCD and the backlight now works like a charm. I was very worried at first that a fuse had gone. If anyone else has this problem on an iPad mini with retina, check this small clip. The backlight plug may look like it is in, but it need pressure on it to actually work. Hope this can help someone in the future.