This also happened to me since I restarted my phone I never had this problem again. It usually happens on first load and then nothing.
To resolve the problem, simply reboot your iPhone. It is not necessary to go to an Apple store. The iPhone 15 black screen can also be caused by a simple bug or a temporary problem. In this case, a simple restart of the device can help resolve the issue. However, since the device is currently unresponsive, you need to force restart it. To do this, you can follow the following steps: Step 1: To force restart your iPhone 15 series, press and release the "Volume Up" button on the left side of your phone. Next, press and release the "Volume Down" button, then press and hold the "Side" button on the right side of the phone. Step 2: Hold the button until the Apple logo appears, then release your finger. This will force start your unresponsive iPhone 15.