Apple will repair tablets affected by the “blank screen issue” until 2021.

It was just about a year ago when Apple resurrected the iPad Air with a new design and a lower price, and if you bought one at launch, your warranty is just about to run out. But fear not, Apple might still fix it for another year.
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https://www.macworld.com/article/3531455/apple-ipad-air-3rd-generation-service-program-for-blank-screen-issue.html