My iPhone7 rear camera showing black screen only

Please note below all the fixes that has been done on various iOS updates especially for Camera. Take your device to an Apple Retail Store or Apple Authorized Service Provider, or contact Apple Support: https://support.apple.com/en-us/HT201232

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iOS 13.5.1 provides important security updates and is recommended for all users.

Some features may not be available for all regions or on all Apple devices. For information on the security content of Apple software updates, please visit this website: https://support.apple.com/kb/HT201222 

Cameras were addressed in the following iOS updates

iOS 13.4

• Fixes an issue in Camera where the viewfinder may appear as a black screen after launch
• Addresses an issue in the Home app where tapping an activity notification from a security camera may open a different recording

iOS 13.3.1

• Addresses an issue where FaceTime could use the rear facing ultra-wide camera instead of the wide camera

iOS 13.2

Camera

• Deep Fusion for iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max uses the A13 Bionic Neural Engine to capture multiple images at various exposures, run a pixel-by-pixel analysis, and fuse the highest quality parts of the images together resulting in photos with dramatically better texture, details, and reduced noise, especially for mid to low light scenes
• Ability to change the video resolution directly from the Camera app for iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max

Home App

• HomeKit Secure Video enables you to privately capture, store, and view encrypted video from your security cameras and features people, animal, and vehicle detection

iOS 13.1.2

• Fixes an issue where Camera may not work

iOS 13.1

• Fixes an issue that could cause Camera orientation to appear rotated when swiping to it from the Lock screen

iOS 13

Camera & Photos

• An all-new Photos tab with a curated view of your library making it easy to find, relive, and share your photos and videos
• Powerful new photo editing tools that make it easier to edit, adjust, and review photos at a glance
• Video editing with over 30 new tools, including Rotate, Crop, and Enhance
• The ability to increase or decrease Portrait Lighting intensity on iPhone XR, iPhone XS and iPhone XS Max
• High-Key Light Mono, a new Portrait Lighting effect, for a monochromatic portrait with a white background on iPhone XR, iPhone XS and iPhone XS Max
• Per‑site settings to choose Reader view, and enable content blockers, camera, microphone, and location access for individual websites
• Download manager

China

• A dedicated QR code mode in Camera, accessible from the Control Center, for improved QR code performance, a flashlight option, and enhanced privacy

Voice Control

• Attention Awareness to keep Voice Control off when you turn your head away from True Depth camera on supported iPhone models

Update to iOS 13.5.1