Why is back camera and flashlight not working?
Why is my back camera and flashlight not working?
Is this a good question?
Why is my back camera and flashlight not working?
Is this a good question?
More often than not, if the rear camera and flashlight are not working on any iPhone it's because one of the rear cameras is bad. In the case of the iPhone 8, there's only one rear camera which simplifies things somewhat. Regardless, the enable signal for the flash comes through the camera, so issues with it can also interfere with its function.
For a more complete answer, I might look at the iPhone Black Screen troubleshooting page.
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To add to Alisha's excellent answer, here are the instructions you would need in order to replace the rear camera.
iPhone 8 Rear Camera Replacement
You can buy a replacement here on iFixit, or find them on most of the popular websites for parts like Amazon, eBay and AliExpress. Here's an example from Amazon.
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