Screen goes black in video

To address the issue you're experiencing, you can try the following troubleshooting steps, which are applicable to various iPhone models and iOS versions:

1. Go to "Settings" > "Display & Brightness" and check your display settings. You can try adjusting the brightness and auto-brightness settings to see if it helps.
2. There may be some accessibility features or settings enabled that could be causing this issue. Go to "Settings" > "Accessibility" and review the options there.
3. Sometimes, third-party apps or background processes can cause display issues. Make sure to close any apps running in the background and see if the problem persists.
4. Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.
   1. Restart the device. That's it.
   2. Still not solved --> Force restart iPhone - Apple Support
5. If the issue persists, you can try resetting all settings on your iPhone. This will not erase your data but will reset all personalized settings to their default values. Go to Settings > General > Transfer & Reset > Reset > Reset All Settings and confirm the action. Note that you will need to reconfigure your settings afterward. All settings—including network settings, the keyboard dictionary, the Home screen layout, location settings, privacy settings, and Apple Pay cards—are removed or reset to their defaults. No data or media are deleted.
   1. Reset All Settings: Return iPhone settings to their defaults - Apple Support:- Return iPhone settings to their defaults
   2. You can return settings to their defaults without erasing your content.
   3. If you want to save your settings, back up your iPhone before returning them to their defaults. For example, if you’re trying to solve a problem but returning settings to their defaults doesn’t help, you might want to restore your previous settings from a backup.
6. Make sure you have the latest updates installed.
   1. Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
   2. Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)

If none of the above steps resolve the issue, it is recommended to reach out to Apple Support or visit an authorized service center for further assistance. They can provide specific guidance based on your device model and iOS version.

Remember that it's crucial to back up your data before attempting any significant troubleshooting or resetting your device. You can back up your iPhone using iCloud or iTunes (on a computer) to ensure that your data is safe.