Daz82 The green lines have happened across many brands of device with an AMOLED screen:
“We’ve seen reports of this green line issue across smartphone manufacturers, including but not limited to Samsung, OnePlus, OPPO, realme, vivo, iQOO, Xiaomi, Motorola, Nothing, HUAWEI, and even Apple for that matter, indicating that the issue is less likely to be of software origin and more likely to be originating from a hardware defect.”
“Our best guess on the cause of the green line issue is a loose, damaged, or defective display connector or flex cable that, in turn, permanently and irreversibly damages the display. The display connector and flex cable are part of the phone assembly that connects the display to the motherboard.”
From here: https://www.androidauthority.com/how-to-fix-green-line-issue-on-phone-screen-3342058/