I have a Dahua XVR (32 total IP+analog cams, 24 analog BNC ports). IP cams attached to it are OK.
Recently, it appears that analog cameras are failing; just black display on the NVR/web/SmartPSS. But the cameras have power; I can see the LEDs and sometimes hear the internal relay click when it switches between light and infrared. The old wall-mount power supply (18 ports) is OK, producing 12.5VDC. A couple cables I checked show 12VDC at the camera end (can't yet check voltage with camera...
Dahua XVR slowly not displaying analog cams
Recently, it appears that analog cameras are failing; just black display on the NVR/web/SmartPSS. But the cameras have power; I can see the LEDs and sometimes hear the internal relay click when it switches between light and infrared. The old wall-mount power supply (18 ports) is OK, producing 12.5VDC. A couple cables I checked show 12VDC at the camera end (can't yet check voltage with camera...
Dahua XVR slowly not displaying analog cams