Troubleshooting CCTV HD cameras can involve several steps to identify and resolve issues. Here's a general guide:

i. Power Supply: Ensure that the camera is receiving power. Check the power adapter, cables, and connections. Sometimes power issues can arise from faulty adapters or loose connections.

ii. Camera Connection: Make sure the camera is properly connected to the DVR or NVR. Check the cables and connectors for any damage or looseness.

iii. Network Connectivity: If the camera is IPbased, ensure it's connected to the network properly. Check network cables, switches, and routers. You may need to check IP addresses and network settings to ensure proper communication.

iv. Camera Positioning and Lens: Check the camera's positioning and lens for any obstructions or misalignment. Adjust the camera angle or focus if necessary.

v. Image Quality: If the image quality is poor or distorted, check for any environmental factors such as lighting conditions or reflections that may be affecting the camera's performance.

vi. Firmware and Software Updates: Ensure that the camera's firmware is up to date. Manufacturers often release updates to address bugs and improve performance.

vii. Resetting the Camera: Sometimes resetting the camera to its factory defaults can resolve issues. Refer to the camera's manual for instructions on how to reset it.

viii. Testing with Another Device: Connect the camera to a different DVR/NVR or monitor to see if the issue persists. This can help determine whether the problem lies with the camera or the recording device.

ix. Check DVR/NVR Settings: Make sure the camera is properly configured in the DVR/NVR settings. Verify that the correct camera channels are selected and configured.

x. Physical Inspection: If none of the above steps resolve the issue, physically inspect the camera for any signs of damage or malfunction. It's possible that the camera may need repair or replacement.

If you're still unable to resolve the issue after troubleshooting, you may need to contact the manufacturer's technical support or seek assistance from a professional CCTV installer.