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I have iPhone 12. A green line starts to appear after using few days. It was never dropped. Can it caused be by manufacturing fault or accident damages? Can 3rd party repairer cover under warranty ? See the attached prob in the video. what are your thoughts?

its either an issue with the oled panel or the flex cable, only authorised apple technicians can service under warranty otherwise you would need to pay to have it replaced by 3rd party

It doesn’t matter what caused it, full screen replacement necessary. What you mean 3rd party repair? Why would 3rd party cover this?