I have had a similar issue with my personal tablet. My issue was solved by removing the case the tablet was in. The case did not have appropriate cut out for the rear camera. However If this is not your issue it sounds like your camera maybe bad. You should check out the trouble shooting page. Asus MeMO Pad 8 Troubleshooting If you still feel that the camera should be replaced here is a guide for replacing the rear camera. Asus MeMO Pad 8 ME181C Rear Facing Camera Replacement