Hello Ricos979, welcome to the Samsung Community! I understand your concerns with your device screen having a blinking red LED. Have you tried Safe Mode to see if the LED is still there? If the LED is not there then there is a third party app causing the issue. You would need to uninstall any recent apps that were installed around the time the issue started.
Press and hold the power button until the power menu displayed
Touch and hold Power off until Safe mode icon is displayed
Tap Safe Mode (If you entered Safe Mode successfully you'll see "Safe Mode" displayed at the bottom)
Once if Safe Mode is the red LED still on screen?
To exit Safe Mode press and hold power until the power menu displays and restart device normal
If the issue is not resolved perform a factory data reset: Please be sure to back up your device before performing the reset
Navigate to Settings. Search for and select Factory data reset. Tap Factory data reset again, and then tap Reset. Follow the on-screen prompts to complete the reset. You may need to enter your Samsung account password or Lock screen password. The phone or tablet will reboot. Before installing any apps, make sure that your display no longer shows the red LED.
