Fault With Primary Camera

I think it is the rear camera. A bad causing under voltage would cause more trouble like a unresponding or ghosting touch screen. Replace the rear camera first. This was a very common problem of iPhone 5 that the rear or front camera stops working and causes crashes of the camera application. If this doesn´t work out please post your results so we can check the next steps. Use this guide iPhone 5 Rear-Facing Camera Replacement and good look to you.

P

Please check this link below:- https://www.ifixit.com/Answers/View/401770/Rear+Camera+black+screen

Thanks

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Troublshooter101

https://www.youtube.com/watch?v=56pxjZsoTAg this is a video link