Sorry to hear this but the green line issue on phones is a hardware problem that cannot be fixed by software. The display of the affected phone needs to be replaced, and depending on the phone model, such repair can possibly include the display assembly and the motherboard. Please get in touch with customer support to initiate a repair.
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Samsung offers a variety of repair locations, including walk-in Samsung service centers. Select the product that needs service to find a location near you.
Reset phone to factory default. This will isolate the problem as software or hardware backup your phone first by Samsung Smart Switch to your pc to save your data.
