ericm23

After some research I believe it is going to take a firmware upgrade to fix the issue. I'll post if I have success after upgrading.

I have 23 DS-2CD2112-I IP Cameras installed with a 10/100/1000 POE switch and a Hik 32 Channel NVR. Night one of install the cameras switched to black and white and all was well. The customer called me last night complaining half the cameras were black and/or dark including one in the Lobby that has continuous light (you can still make out some of the image so I know the picture is there). I thought maybe I had a POE power problem becuase some of the runs are long; however switching from "Auto Switch Day/Night" to manual fixes the issue. Any suggestions on image settings for these cameras? This is my first Hikvision install. I didn't make any adjustments to the image settings. Here is a screen shot of the first 16

I was using CATV RG6. Won't use it again.

I figured out the problem. The RG6 I was using. Too bad this job is complete. Although the owner never noticed, so I guess I drive myself crazy. Anyway I figured it out on another job I was on. I had wired a different hotel with RG59 and went back to add 1 camera. I used RG6 for this one camera. Guess which camera had the same exact diagonal rolling lines.......Replaced with 59 cleared the problem. I'm not saying there is not a ground loop problem, but I do believe the RG6 I was using was picking up electrical current.

Mike. I sent you a PM with the IP info. As an update for everyone. I have isolated each camera and still no luck. However, the problem has shifted to cameras that previously had no problem and some of the original problem cameras are now clear.

Tried an individual power supply on a problem camera with the same result. Tried a different dedicated power outlet. I am at a loss. The bundle of wires come down a wall from the second, third and forth floors and then over in the 1st floor hall. I pulled the laundry room camera wire out of the bundle from the 1st floor hall and routed it strait to the DVR and I still have the problem. The laundry room cam wire is in plastic conduit that is stubbed out in the hall and then I have it running by itself to the DVR through the laundry room ceiling. Does anyone know the main cause of faint horizontal lines scrolling across the camera image? I don't think this is a ground loop issue.

If anyone has DVR Viewer I have the dvr online now. You can really see the diagonal lines on some of the channels. Let me know and I can give you the IP address and password

They do not show up on the test monitor when at the camera, but they do show up on the test monitor when I pull the BNC off the DVR and connect strait to the Test Monitor on the DVR end.

I went back and tried the plug you suggested. I still get the same problem with diagonal lines. I also bought a ground loop isolator and that did not work. Any other suggestions?

I have the power supply grounded to a Panamax Surge Protection. I don't have the DVR grounded, but I do get the same lines plugged into my test monitor when I pull the BNC off the DVR and plug directly to my test monitor. The DVR, Power Supply, and Monitor plug into the Panamax Surge protection; it has a ground . Do these plugs eliminate the ground temporarily to test for ground loop? Thank you

I took another look today for electrical wires touching my wires. Really didn't see anything down the halls. There is a fire panel on the other side of the wall from my equipment (DVR, Power Supply) and I am guessing they ran their wires by mine, though my bundle runs in a large PVC pipe to the managers office from the 1st floor hall. I read that diagonal lines could be caused by crosstalk with another high frequency wire. Have you ever heard of interference with a fire panel or fire alarm wires?

I have 5 outdoor cameras mounted to stucco and wood and the others are mounted to sheetrock and drop ceiling. The 1 camera that does not have a problem is also the 1 camera that does not run in a main bundle of wires to the managers office. I am thinking ac bleeding into the coax or 18/2, but I am hoping it is not. If it is, I am wondering how I can test/fix the problem. We keep all of our wires in a bundle very neat in d-ring runs so I don't think it should be too close to the electrical. Thanks

You can purchase a video distribution amp with BNC inputs. Usually 4 inputs is the minimum. Google CCTV video distribution amp

Yes. I am using solid copper core with copper braid. Thanks.

Hello All I have been installing CCTV systems for about three years in hotels. I use the same outdoor cameras, indoor domes, power supply and DVR on every install. I am using the following: 1 Vitek SAGA 16 Channel DVR 5 Samsung Day/Night Cameras with varifocal lens and housing 1 Vitek Varifocal Dome 10 Nuvico Varifocal Dome 1 24VAC 16 input power supply The Problem: On almost every camera there are thin diagonal lines that go from right to left across the screen. They are not really noticable when all 16 cameras are up, but when you go to a single camera it is. I have disconnected the power supply and hooked up a single transformer to one camera and it still does it. I don't know what else to try. I am running in a hall with electrical, but that is normally how I run the camera wire. I am using 18/2 and RG6. When at the camera with a test monitor there is no problem with the picture. Please Help!