How do I fix a black screen on an Android phone?

Force the phone to restart. A hard restart can clear up a lot of crucial system issues. Depending on the model of Android phone you have, you may need to press a combination of buttons to force the phone to restart, such as:

• Press and hold the Home, Power, and Volume Down/Up buttons at the same time.
• Hold down the Home and Power buttons.
• Hold down the Power/Bixby button until the phone totally turns down.
• After your phone has completely shut down, remember to restart it.
• check if this method work or not