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Here are some easy ways in which you can fix the issue quickly!
Remove SD Card: SD cards can cause compatibility issues with Samsung Galaxy phones. Try removing the SD card and rebooting your device to see if the problem persists.
Soft Reset your Phone: A soft reset involves turning off your Samsung Galaxy, removing the battery for 30 seconds, then restarting the phone after re-inserting the battery.
Enter Safe Mode: Enter safe mode to check if third-party apps are causing the black screen. If they are, simply uninstall those apps to resolve the issue
Wait Until the Battery is Draining: Some users say that charging a device after the battery runs out can fix a black screen issue. Try this simple method as well.
Remove Cache Partition: Removing the cache partition on a Samsung device can resolve a black screen issue by clearing temporary files that may be causing the problem.
Clean the Charging Port: Cleaning the charging port can fix a black screen by removing dust that might block the connection.
Try Recovery Mode: Try Recovery Mode to resolve the issue by clearing the cache, which can fix problems like a black screen.
Factory Reset: If clearing the cache doesn’t work, consider "Wipe data/factory reset" (note: this will erase all data on your device).
Get Help From Professionals: Your handset might have a hardware issue and the best thing to do is to go to Samsung or visit your nearest iFixScreens store to have your phone checked.