What you'll notice
The picture pulses, rolls or flickers — often worse at night or when certain equipment nearby switches on.
Why it happens
Electrical interference onto the video line, a failing power supply sagging under load, ground loops between buildings, or mains-frequency conflict with LED lighting.
How we fix it
We isolate the source with a process of elimination — clean power, screened cable, ground-loop isolators — rather than living with a picture you cannot use as evidence.
Still not working?
If the checks above haven't restored your cctv camera, this usually needs a technician. Our CCTV Repairs service covers exactly this fault.