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Thank you the toss for you reply the test of the white image gives the same result on the three DVRs if I use the same input with other cameras it works fine I connect a BNC earthed monitor to the DVR ....it gives the same result (white image) It seems like electrical problem or grounding problem

Hi all Please, excuse me for my poor English I need your Help. I have a big problem with an analog cameras installed in a seawater desalination plant. on some cameras I have a very white image (see attached image) I installed : 38 analogue cameras (Messoa SCB267) + 3 Samsung 1654 DVR + on line UPS Liebert GXT3 5 kVA + a KX100 armored coaxial cable . A common 220 VAC power supply (without earth) is installed then it split up to power on each camera, then there is a 24VDC power supply into enclosure to power the camera and fan. The very white image doesn't have relation with camera’s settings or lens. On one side I have 5 cameras: C1 (400 feet), C2 (600 feet), C3 (900 feet), C4 and C5 (800 feet) The cables of cameras are installed together in underground sheaths over a distance of 400 feet (until C1) then they split up: C1, C2 and C3 on the one direction and C5 and C4 on the other direction On the first common 200 feet I had to install the video cables near a high voltage cable (distance 3-4 feet) At the beginning there was the problem (white image) on C1, C2 and C3 only (C4 and C5 were OK) . To solve the problem I installed a video converter (coax to FO to coax) and the problem was solved but some hours after C4 and C5 have become also white. I have the same problem on other direction: 3 cameras were very white , I install the coax to FO converter , the 3 camera became OK but two cameras became white. The video converters and FO are very expensive and a I can’t install another one. Note : I have a camera with over 1100 feet coaxial cable an it’s working fine. Thank you for your time,

Hi evry one , Well, I did an other test : I connect my (white) camera on DVR , and earthed BNC Monitor connected to the DVR ... result : white image. Is threre somthing wrong between the DVR , the UPS , the earth ? help please

Hi all This morning I made a new test : in the control room , I connect my camera (with white image) directly on my small BNC monitor ... it works very fine " title="Applause" /> I connect the same camera on my DVR , the image is very white my DVR doesn't have a BNC output so I'm using a 40" VGA monitor All my systeme is earth grounded (on-line UPS , DVR , ....) the Small BNC monitor is powred with earth throw my USP but the 40" VGA monitor doesn't have a ground can this probleme (white image on some cameras) be caused by non earthed monitor ? thank you