Display flickering

Dear Samsung Customer,

Greetings from Samsung Customer Support!

Thank you for sharing your concern. We acknowledge your query and apologize for the same. And please follow the easy troubleshooting steps which might help to solve the issue.

To resolve the screen flicker issue follow the below steps :
1: Adjust the Display brightness, follow the below step
Step1: Navigate to apps screen and tap on Settings.
Step2: Tap on Display.
Step3: Adjust the brightness.

If the issue still persists then Reset the device settings by navigating to Settings >> General Management >> Reset >> Reset Settings.

If the issue still not resolved then Update device software (If available )

Setting >> Software update >> Check for Software update >> Download if available.

If the issue still not resolve then reset the phone. ( Please make sure you have back up of your important files in Samsung cloud before resetting the device)

Backup and Factory Data reset
Kindly create data backup of your device via SMART switch mobile application or Smart Switch PC Suite and reset the device through below steps:-

Setting > Backup and Reset > Factory data reset OR Settings > General Management > Reset > Factory data reset.
Note:- Kindly remove Google account configured in the device before resetting through below steps:-
Settings > Accounts > Google > Tap on account > Click on more option at top right corner > Tap on Remove Account OR Settings > Cloud and Accounts > Accounts > Google > Clock on three dots in top right corner of screen > Remove Account.

In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report).

Thank you for writing to us.
Warm Regards,
Samsung Customer Support.