The most obvious reason your iPhone background turned black is because you set a black wallpaper. To check this: Go to Settings > Wallpaper on your iPhone. Under "Choose a New Wallpaper," check what image is set. If it's solid black, tap on it to change it back to a normal photo wallpaper or color. This is the easiest fix!. The iPhone can dim the brightness while the iPhone goes into the Sleep Mode. So, when the iPhone is in Sleep Mode, it can be the reason why the wallpaper is turning black. Step 1 - You can do this directly from the Control Center. So, swipe down to get access to it. Step 2 - Now, just tap the " Sleep Mode " to disable it on your iPhone.
What Causes the Black Background Issue? You're not imagining things— your iPhone background turning black out of nowhere is a real (and surprisingly common) issue. It usually comes down to a few various factors: 1. iOS Glitches After an Update Sometimes, the culprit is a simple software glitch after your latest iOS update. These updates are designed to improve your device— but they can.. Your Home Screen background may be blurred instead of the wallpaper photo you selected. This is a feature that ensures that app icons are easily visible. You can turn this off and on while customizing your wallpaper. The problem described in this article is different. With this problem, the wallpaper is gone completely, and a black color is displayed as wallpaper.