How to Fix the Green Line on an Android Phone

Attempt all the techniques provided below to eliminate the green line from your phone's screen.  A loose or damaged display connector may be causing the green line to persist on your phone. It is also possible that your phone was damaged by a fall or water exposure.

 If your Phone has a Green Line on it , try these Possible fixes :

1. Kindly switch off your mobile phone.  Commence by powering down your phone and then powering it back up.  Switch off your phone completely and restart it instead of simply turning off the screen.  This straightforward solution can solve many problems because it restarts and closes everything on your phone.  Resolving any temporary software issues that could create the green line can be done by restarting your phone.

Source -By Samsung community 

2. To fix a green line on your phone's screen, try removing recently used or installed apps, especially if an incompatible or malfunctioning app caused the issue. Reversing any recent changes to your settings may also help. Alternatively, try rebooting your phone in Safe Mode to identify any software issues. Safe Mode only launches essential apps, so if the green line disappears in Safe Mode, it means that there is a problem with an app, setting, or the operating system.

3. If your Android device is experiencing a green line issue on the screen, it may be resolved by updating the operating system. Check if any updates are available, as the update may fix any problems with the current version of Android. The phone manufacturer may have already released an update that addresses the issue. To check, follow these steps (note that the steps may vary depending on the device's brand):

• open the Settings menu
• Select System.
• Select Upgrade system.

  If your device is out of date, you will notice that a new update is available. Otherwise, you will see the message "Your system is up to date."Accept the update installation and you're done.

4. Before sending your Android phone for service, consider factory resetting it as a last resort. This option erases all data, including photos, videos, and files, and installs a fresh Android version. A factory reset can resolve software-related green line issues; if the green line persists, it is likely a hardware failure. Always back up your Android phone before performing a factory reset. If there is no update available, consider reverting to a previous operating system version. Resetting to factory settings should fix the green line caused by the latest system update. After the reset, the screen should no longer show green lines if it was a software issue.