Hik-Connect Vertical Lines Appearing in CCTV Feed – Not There Before

[TheOn3]

Hello,

I have recently noticed several evenly spaced vertical lines appearing in one of my Hikvision camera feeds. These lines were not present before, and when I play back footage from earlier dates, the lines are not there — they have only shown up recently. The issue affects only this camera feed, as the other camera feeds do not show the problem at all (see attached screenshots).

The setup hasn’t been physically moved or altered, but the lines suddenly appeared.

I’d appreciate any advice on what might be causing this and how to fix it.

Thank you.

 

[JB1970]

It’s an analogue HD system (DVR) and is interference usually caused by a power supply issue, poor termination, or ground fault.

Power supply is easiest to rule out - replace it ensuring the new one has sufficient output for the cameras. An overloaded PSU could cause this.

Termination. Moisture ingress at the cameras connector causes the braid on the coaxial cable to fail resulting in a bad ground. Poor termination in general can lead to interference from other electrical sources.

Ground fault/hum. The metal body of the BNC connections are interconnected to one another and mains earth at the DVR. The outer body of that connection is what the coaxial braid is connected to. If the cable is damaged between the recorder and camera, or if the camera is mounted touching any metal structure in contact with physical ground, a potential difference (voltage) can exist between the ground connections at each end of the cable resulting in interference being visible.

 

[TheOn3]

It’s an analogue HD system (DVR) and is interference usually caused by a power supply issue, poor termination, or ground fault.

Power supply is easiest to rule out - replace it ensuring the new one has sufficient output for the cameras. An overloaded PSU could cause this.

Termination. Moisture ingress at the cameras connector causes the braid on the coaxial cable to fail resulting in a bad ground. Poor termination in general can lead to interference from other electrical sources.

Ground fault/hum. The metal body of the BNC connections are interconnected to one another and mains earth at the DVR. The outer body of that connection is what the coaxial braid is connected to. If the cable is damaged between the recorder and camera, or if the camera is mounted touching any metal structure in contact with physical ground, a potential difference (voltage) can exist between the ground connections at each end of the cable resulting in interference being visible.

Really weird, today the lines have gone. It's back to normal. Does this indicate that it could be something else?

 

[JB1970]

Really weird, today the lines have gone. It's back to normal. Does this indicate that it could be something else?

It's not possible to determine. All you can do is inspect all of the connections. Poor connections make it more susceptible to mains related interference.