Reconnect BNC connector and unplug PoE switch to troubleshoot video loss on analog and IP PoE cameras. 
Avoid physical barriers (walls, trees, etc.). Choose the right channel (some routers can emit 2.4 and 5 GHz signals). Move your cameras closer to the router if possible (or your router closer to the cameras if not). WiFi signal interruption and interference. There are too many physical barriers between your camera and the router. The camera(s) are too far away from the home router. Video loss or weak video signal on security cameras on a wireless network segment could be caused by unstable network connections, a weak WiFi connection or low internet bandwidth. Reason #3: Weak WiFi Connection or Low Bandwidth Use a block of wood in between if there’s no non-metal surface for mounting your cameras. UPS (uninterruptible power supply) units will protect your equipment from power outages. 
Use power and lightning surge protectors to protect your equipment. Electrical current interference from nearby electrical equipment. Mounting the cameras to a metal/conductive surface. It is likely to cause a sudden video loss, total black screens or vertical lines as well as serious damage to the cameras circuit boards or other components. If you are using battery-powered cameras, make sure the battery is not dead or the solar charger is blocked.Ī power spike can be an awful problem for a system. Try using shorter BNC or Ethernet cables to power cameras and avoid using low-quality extension cables or extension cords. This is because PTZ cameras and IR cameras require more electricity. Connect the cameras directly to the NVR instead of via a PoE in case the PoE switch could be supplying insufficient power. Switch ports to make sure the DVR/NVR port is providing power to the cameras. Double-check all power connections, power splitters, cable connectors to exclude connection issues. Faulty power cables (old, damaged, degraded). The cable is too long, or one cable is supplying too many cameras at once. Here are some common reasons for insufficient power supply: This is a situation where there is not enough power resulting in video signal loss, a camera going black or camera video flickering on and off. As you can see there are a lot of potential issues that can surface in the operation of your system. Sometimes the camera video flickers, shows a lined screen and monitor, or the DVR gets no picture or signal from the camera. Sometimes a CCTV system loses video feeds on one or more cameras, a camera gets a loose connection, goes black at night or gets no video with a camera showing a black screen. We also give you tips for where to look to fix those problems quickly and efficiently and get you up and running. We’ve put together a list of the most likely reasons why you might have a loss of video signal on your CCTV security cameras and systems and DVR camera systems. And it’s important to find out why and to find out quickly. So, it can be a big deal if those cameras stop working. Either internally in your organization or externally on your property. 
When you set up surveillance cameras it’s because you need to keep an eye on things.
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