A black background on your phone's screen can be caused by a variety of reasons, including software issues, improper adjustment of display settings, or hardware failures (e.g., broken screen, loose cables, etc.). Depending on the cause of the problem, the workaround will also vary. Here are some basic steps and suggestions to help you try to restore the normal color of your phone's screen:
Operation: Press and hold the power button and select Restart (or turn off and on). Sometimes, a simple reboot can resolve a temporary software conflict or display issue.
Brightness adjustment: Make sure that the screen brightness is not set too low.
Night Mode Reading mode: Check to see if night mode or reading mode is enabled, which may change the color of the screen.
Theme or wallpaper: Check if you are using some special themes or wallpapers, which may affect the display.
System updates: Check if there is an OS update available on your phone, sometimes a system update can fix a known display issue.
Apply updates: If the issue occurs in a specific app, make sure the app is updated to the latest version.
Operation: Try booting your phone into safe mode. In safe mode, all third-party apps are disabled, and if the issue is resolved, it may be a third-party app. The exact method of entering safe mode varies depending on the phone model, but usually involves something like holding down the volume keys while restarting.
Note: If none of the above steps resolve the issue, consider doing a factory reset. Please note that this will erase all data on your phone, so make a backup first.
Operation: Find the option to do a factory reset in the settings menu.
If a hardware issue is suspected (such as a broken screen, poor connection, etc.), the best thing to do is to take your phone to a professional repair site for an examination. Especially in cases where the phone has been dropped or damaged by water, the hardware damage of the screen can be the cause of the abnormal color.
Before taking any reset or restore operations, make sure that all important data has been backed up. If you're not sure how to do this, or if the problem persists, it's a good idea to contact your phone manufacturer's customer service or a professional repair service for help.