Screen
Have an new IPad 9. generation. Why a vertical Line on the screen and what to do? It is on the same place all time, Even when iPad not in use
iPad Air, iOS 12
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The line that you see is generally indicative of a screen hardware fault.
A reliable method to confirm a screen or other hardware fault is to take a screenshot when the fault is evident - and then review the captured screenshot image...
When reviewed, if the lines are not present in the screenshot image, then you have demonstrated that you have a hardware fault that, sooner or later, may become sufficiently severe that repair or replacement of the iPad are the only options. If the lines are visible in the screenshot image, the something other than hardware will be the cause.
Note: When reviewing the image, rotating the iPad screen orientation by 90°, from Portrait to Landscape, will ensure that the image does not coincide with screen defects if present.
Take a screenshot on your iPad – Apple Support
If the test suggests that you have a hardware fault, you would be well advised to seek assistance from the technicians at the Genius Bar or your local Apple Store or Apple Authorised Service Provider:
Genius Bar Reservation and Apple Support Options - Apple