iPad Air (3rd generation) Service Program for Blank Screen Issue
Apple has determined that, under certain circumstances, the screen on a limited number of iPad Air (3rd generation) devices may go blank permanently. A brief flicker or flash may appear before the screen goes blank.
Affected devices were manufactured between March 2019 and October 2019. MAC|SYS will service eligible devices, free of charge.
The link below to Apple's support page will give you more detail of the programme.