Avtech 798A Image Flicker

[fsolanes 0]

Hello all, new to this forum and was hoping someone could help.

I recently purchased an Avtech DVR. I'm having a problem when night time rolls around and the camera's IR is on or it gets dark not really sure. ALL the cameras start to get a frequent flicker like the images attached not at the same time it jumps from channel to channel. Tried another New Avtech DVR same thing. Previous non Avtech DVR had no issues.

disconnected all other cameras same issue. i'm stumped.

Normal:

 

 

Flicker:

 

 

anyhow thanks for anyones imput.

[Roula 0]

what is firmware on your unit

[fsolanes 0]

Thanks for the reply, I believe it has the latest firmware..1021-1005-1006-1005

[scorpion 0]

You have swapped out two DVR with the same effect.

 

I would suspect a bad power supply.

 

I am thinking the cameras look great during the day, but at night when the IR's kick on it sucks more current then the power supply can handle or the power supply is having somekind of an issue.

 

you can test by taking two cameras off line. Did the video clear up?

 

Is this related to moisture such as rain? If it works fine except for rainy weather then I would check connections.

 

If it was premade cables and you have video issues then I would check the bnc to rca adapter.

[Roula 0]

Okay it is grounding issue on your cable check your ends i was able to get the same issue you are having with bad cable hope this help

[fsolanes 0]

Thank you for your replies, I will try the following and report back.

Disconnect all the cameras but 1 that currently flickers. then replace that cable with known tested cable and wait till night time and see.

In addition to the new cable removing possible ground loop I will also try a separate single camera power supply..

Hope this works