Answer to "Not Charging but shows display"Google RxTech Repair and send it to them. Much cheaper than buying a new one.
Answer to "iPad Air - not charging or turning on."Take it to a shop that can do micro-soldering. Here's one that can do the job. They're in CA. It took them less than a day to figure out, called me, and sent it back. Works like a charm. They are called RxTech Repair.