Troubleshooting CCTV Video - Part 1; No Video Signal
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There is no video on my cameras!
First check the power. If the cameras have power, they should get warm to the touch. If your cameras are cold, they probably don’t have power. For dome cameras, unscrew the dome cover to feel the camera inside. Be careful! The domes can get quite hot to the touch.
Note: When adjusting the wiring on any of the cameras, turn off or unplug the camera power supply box! It is extremely easy to blow a fuse if the power supply is on when you are re-wiring your cameras.
-Check that the camera power supply is plugged in
-Check that the power supply on/off switch is on
-Check the fuses inside the power supply; if a fuse is ok, the light next to it should be on
-Check the power connections to the power box
-Check the power connections to the cameras
If you are *certain* that the cameras have power, check your twist-on video connectors (if you bought a reel of cable with twist-on connectors)
-The cable must be prepared as shown in the installation picture
-Check that none of the outer grounding shield is touching the inner conductor
-Check that the inner conductor is connecting with the inner socket in the twist-on connector
-Check that the outer grounding shield is making solid contact with the outer housing of the twist-on connector
If some cameras are working but one is not, try these steps:
-Double-check the fuse and power on that camera
-To check the camera:
Take the non-working camera to a location where a working camera is installed. Unhook the working camera and replace it with the non-working one. If you get video, the camera is good and either the cable or the DVR is at fault
-To check the DVR:
Hook up the cameras. Unhook a working video input from the DVR and swap it with a non-working input. If the working camera works on both inputs, the DVR is working properly; the problem is with the camera or cable
For video that is noisy or “grainy”
-Triple-check the twist-on connectors: if part of the ground shield is touching the inner conductor, it can lead to noise issues. Additionally, ensure that the cable’s ground shield is in firm contact with the twist-on connector. Good grounding is essential for good video!
-Avoid running your video cable near noise sources such as electric motors, electric welders, and lights