CCTV Vertical Coloured Lines Rolling Across Screen Interference

[alfatv]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

To check if it's DVR, connect cameras with short wires next to DVR.

[BadmanRasta]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

Good day to you! The camera matrix may be damaged if such problems occur. This could have been caused by physical damage. You should contact the master to see what the possible problem is. If you have to replace the camera, then I would advise you to save a little money and buy a complete set of ajax security system. I have been using this for quite some time and so far I have not had any problems with such systems. You may find it interesting to read more on the Internet. Good luck with your camera!

[AleksShamles]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

I think that you bought a defective CCTV and the better option for you would be to buy a new one.

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

I am mostly interested in a DVR with Dahua software though. I also want the same Alarm IO and Smart features (face detection, missing object, smart search) that the Dahua DVR offers. It is very hard to find this with Lorex systems though. Any other suggestions?
Here is a link for the DVR that I am looking to buy: https://www.amazon.com/gp/product/B072DX5417
The only issue is that I have no idea if the seller "Q1C1" is authorized.

[CapLeaker]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

Most of the stuff Lorex has, is rebranded Dahua.

[TornadoAlley]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

I am looking to purchase a Dahua DVR but I have no idea from what seller I can purchase it from. I want it to be official and not some DVR with fake firmware or whatever from an unofficial reseller. I want to purchase it from Amazon but there are so many listings from different sellers that I don't even know which is real. For example, there are 3 different companies on Amazon named "DahuaOEM", "DAHUA", and "Dahua Technology". I would like to know which one is authentic or if any of them are even are authentic. I want to make this purchase knowing that I will be getting the right DVR and not some knock off re branded version that doesn't even have the same features and will possibly be vulnerable to being hacked. Thanks!

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

Unfortunately I do not have any monitors supporting this type of input. I tried a video/bnc adapter but the video did not work.

[R_J]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

If it was a power issue, then the 4 cameras on the one splitter would not have the problem, the camera power is DC so it would not cause this type of interference. The problem is with the video and having shielded cable is the way to go so there won't be any interference. Running multiple shielded cables is done all the time without a problem. Don't you have ant extra monitors around that would have video in? Connect a couple cameras straight to seperate monitors and I bet they don't show the interference.

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

I'm not saying it is cheap, it is just that when you combine two or more of the same video signal they need to be kept seperate, If one video signal starts to combine with the other, there will be an issue. If you have a way of trying another unit that would be the best, that way you can confirm the problem.

Do you think it is some type of power interference? Do you think having multiple cables running next to each other is messing up their power and causing interference?

[R_J]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

I'm not saying it is cheap, it is just that when you combine two or more of the same video signal they need to be kept seperate, If one video signal starts to combine with the other, there will be an issue. If you have a way of trying another unit that would be the best, that way you can confirm the problem.

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

So as soon as a second channel is connected (any camera of the 16) the lines appear. If just touching the second cameras bnc to the dvr does'nt give the lines, then its nothing to do with the ground. It is likey just that the dvr has poor isolation and filtering between the video channels. when you have 2 signals that are basically the same they will will produce harmonics that will show up in the image, just like having 2 audio signals thet beat together will produce harmonics

So are you saying my DVR is bad quality and it is causing the lines? I was thinking of upgrading it to begin with but I guess now I have a reason for it now. Now that you say that, the cameras do glitch whenever I tap the Bnc connector on the back of the DVR.

[R_J]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

So as soon as a second channel is connected (any camera of the 16) the lines appear. If just touching the second cameras bnc to the dvr does'nt give the lines, then its nothing to do with the ground. It is likey just that the dvr has poor isolation and filtering between the video channels. when you have 2 signals that are basically the same they will will produce harmonics that will show up in the image, just like having 2 audio signals thet beat together will produce harmonics

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

Results:
When 1 Channel Connected via Power + Video and all other channels ARE connected via power ONLY = Lines Appear

When 1 Channel Connected via Power + Video and all other channels NOT connected via power NOR video = Lines Disappear

When 2 Channel Connected via Power + Video and all other channels ARE connected via power ONLY = Lines Appear

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

You said if you had one camera connected the lines disappeared, if you connect a second camera the lineas appear. I assume this was disconnecting the power to the cameras. with more than one camera powered but only one VIDEO connected, see if the lines are there, if not connect a second camera video, if the lines appear, disconnect the bnc cable and then just touch the bnc ground to the dvr and see if the lines return in the connected camera video.

Sorry, I did mean that I tested it out by removing the power lines. I will try out your method and let you know the results. Thanks!

[R_J]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

You said if you had one camera connected the lines disappeared, if you connect a second camera the lineas appear. I assume this was disconnecting the power to the cameras. with more than one camera powered but only one VIDEO connected, see if the lines are there, if not connect a second camera video, if the lines appear, disconnect the bnc cable and then just touch the bnc ground to the dvr and see if the lines return in the connected camera video.

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

So you have 16 cameras and 4 splitters correct? The splitters are for the Dc only and each camera has a separate video cable from the camera to the DVR unit? If this is correct, try disconnecting each video line and see if that makes a difference.

I actually have the cameras set up to the power supply now. I will try to disconnect each video line separately though and see if there are any differences.

[R_J]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

Has anyone found a solution to this? I have the exact same problem with a ZOSI 16 Channel CCTV System. Vertical lines on every camera. I am using 4 power adapters, each connected to a 4 way splitter to power all 16 cameras. When I power only one camera without the 4 way splitter the lines disappear.

So you have 16 cameras and 4 splitters correct? The splitters are for the Dc only and each camera has a separate video cable from the camera to the DVR unit? If this is correct, try disconnecting each video line and see if that makes a difference.

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

So if it is possibly a ground loop, is there a way to test it out to confirm it?

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

Umm... sorry... if one can afford 16 cameras, he can afford 16 Loop isolators for 8 bucks a piece too.

I purchased the system on a lightening deal. Be more helpful next time.

[TornadoAlley101]

Re: CCTV Vertical Coloured Lines Rolling Across Screen Interference

BNC are the connectors, what type of cable? If it is coax, shielded cable its not an issue. If it's twited pairs of wire then I could see a problem.
A ground loop is a small difference in the 60hz a/c ground between two points, and due to the vertical scan rate being around 59hz, the bar will show as moving upward in the image.

It is a cable sold by ZOSI themselves. It should show all the specs so here is the link: https://www.amazon.com/ZOSI-Extensio.../dp/B0185MMPP2