video noise on cameras

X

xchristty

n3wb
May 28, 2024
10
2
Romania
Hi all,
I started again after one week the DVR and cameras and suddenly I see noise on two of the cameras as in the pics attached. Never happened before.
The DVR is iDS-7104HQHI-M1/S and the cameras are DS-2CE17DOT-LFS.
The cameras are on UTP cable with video baluns and ground loop isolators.
What can I do?
Thank you!
 

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If just 2 cams I'd check the 12VDC connectors at the cam and at the power supply for connection issues like corrrosion.
 
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xchristty said:
The are 4 cams, the power supply is inside. Nothing changed in the connections or configuration since the last start.
Click to expand...
The 12VDC "power supply is inside" of what?
How do you know "nothing changed in the connections"? Have you checked them?
 
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The power supply is indoor. Corrosion is less likely to be, the system is 5 months old and are all protected. Nothing changed in the connections or configuration means that I only logged off and shut down the system about 10 days ago and now just started it....
Sorry if I misunderstand your questions...
 
xchristty said:
The power supply is indoor. Corrosion is less likely to be, the system is 5 months old and are all protected. Nothing changed in the connections or configuration means that I only logged off and shut down the system about 10 days ago and now just started it....
Sorry if I misunderstand your questions...
Click to expand...
But what about the connections at the cameras?

Such as CAT cable to balun to video and to 12VDC?

Five months is plenty of time for high-resistance due to corrosion or oxidation on low-current connections to occur.
 
What do they look like when the sun fully comes up?

Otherwise, Its your cables or power supply
 
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