dahua NVR just stopped displaying cameras?? how to fix?

Something to keep in mind. One of your cameras might be going bad.. I had a Dahua 4mp AI camera fail in POE and took out all POE cameras that were connected on my POE NVR ports all other channels were online. When I connected the cameras to my POE switch again all POE devices went offline even ones that were already working on a different NVR.. In order to get that to work I had to reboot my POE switch. So didn't remember if any of them were POE+ so thought ok try on that Switch and this time rather then plug them all in and wait for them to come online all at one time. I did them one by one and sure enough my Dahua IP4M-N45EF63 caused my whole POE+ switch to shut down and had to reboot the switch.. After taking the bad camera apart I found that a SMD Common Mode Choke had failed and was the cause of issue. Lucky for me it damaged in a way that was a Open and only damage was the SMD common mode choke.. I have since repaired this camera and it is back in service now for the last 7 months without another failure so far..
 
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Thanks for your reply! This morning I realized that these two cameras that were causing troubles are connected via one cablewith switch ATTE xPoE-3-10 3! There was only one wire prepared and I wanted two cameras in that region and my electican asked me to buy ATTE xPoE-3-10 3 to split the signal and have two cameras there. Which means that "thing" may be causing conflict with switch that is next to NVR.
 
Sorry don't know how Poland works. Does your area not offer a Low Voltage or Security camera specialist to work on CCTV or IP camera networks? If you are within the normal 100m personally I would have went with a cable split. Normally cameras can work on af and at using only 4 of the 8 ethernet wires. Using 1, 2, 3, 6 pins of the ethernet plug, There are 4 pairs in a normal Cat5E or 6 cable. Just by adding 4 plugs 2 on each end can work POE Ip cameras and even normal 12v power IP cameras without extra hardware.

With your POE Extender that you bought is it powered with an ATTE passive device or a normal POE or POE+ Switch?
 
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dh777 said:
Thanks for your reply! This morning I realized that these two cameras that were causing troubles are connected via one cablewith switch ATTE xPoE-3-10 3! There was only one wire prepared and I wanted two cameras in that region and my electican asked me to buy ATTE xPoE-3-10 3 to split the signal and have two cameras there. Which means that "thing" may be causing conflict with switch that is next to NVR.
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If the problem is by ATTE xPoE, you can try to replace ATTE with a new one...
or go to passive variant like:


In passive splitter variant You need 2 ethernet/POE ports on switch/NVR side..
 
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Revo2Maxx said:
Sorry don't know how Poland works. Does your area not offer a Low Voltage or Security camera specialist to work on CCTV or IP camera networks? If you are within the normal 100m personally I would have went with a cable split. Normally cameras can work on af and at using only 4 of the 8 ethernet wires. Using 1, 2, 3, 6 pins of the ethernet plug, There are 4 pairs in a normal Cat5E or 6 cable. Just by adding 4 plugs 2 on each end can work POE Ip cameras and even normal 12v power IP cameras without extra hardware.

With your POE Extender that you bought is it powered with an ATTE passive device or a normal POE or POE+ Switch?
Click to expand...

I'd love to answer your question but honestly, I don't know. Electrician that was responsible for the wiring and connecting these cameras is currently unavailable so I can't reach out to him and ask.

steve1225 said:
If the problem is by ATTE xPoE, you can try to replace ATTE with a new one...
or go to passive variant like:


In passive splitter variant You need 2 ethernet/POE ports on switch/NVR side..
Click to expand...

For now - I reconnected the cameras to different ports of the same dahua switch which I got installed next to the NVR and it suddenly works straight 2 days without failiure. Strange! :/
 
Looks like the NVR power module failed. Need to replace it.
 
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No need to replace a Dahua PoE NVR if the Poe ports fail. Simply use an external switch.
 
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IF the NVR POE ports of say 5-8 are working and 1-4 have died then the Power supply isn't the issue. If you can take your camera and connect to a different port of the NVR then 1 of a few things has happened.. 1 the Ethernet Transformer has died, Most likely caused by using CCA cables or some other type of issues that has burned it out. However if you are connected to 1-4 and when you connect to another port on 1-4 and works then it could be a Protection Diode in the NVR for that channel that is dead.. Now I don't know all the NVRs out there but I have repaired a good few to know that if the Power supply is going bad then it would take out all ports of the POE Switch of the NVR.. Even to the point where the NVR won't even power on. Some NVRs when the Ethernet Transformer goes bad even on one of the 4 connected channels there is in some cases where it clamps down and makes it all don't work. Meaning 1-4 Ethernet Transformer burned up port2 it can clamp down the 1, 3, 4 as a way to protect the circuit past that point. Some lets say 16ch POE NVRs can run 4 ethernet transformers and in some I have seen where they only have 2 and in that cases would take out either 1-8 or 9-16. Most would have 4 and only take out 1-4, 5-8, 9-12 and 13-16..

I don't know how long you were using your NVR before you issue came up. What I do know is what ever caused that issue in the first place, Moving your cameras to a new port is good for testing that the cameras are not dead, Not a good idea to run the system very long without someone testing the Wiring and external hardware to make sure they were not the cause.. If the issues was caused by a storm, then I would make sure to double check your storm protection hardware. If you are not running any it is time to get it in place before something worse happens..
 
Thanks for all replies folks. It worked for one day and here we are with the same issue. Unable to find network host for these two cameras that are connected with ATTE X-POE. I also took a picture of switch and what is strange to me is that only four have link/act and poe active, the fourth seems to be totally off.
 

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Here is what I would do, I know that it isn't a great thing, However need to work it out. I personally would remove the Down wire, reboot or power down and then power up the POE Switch. Once all the other cameras come online I would then remove one of the working ones that have all come back up, Unplug one wait 10 to 20 seconds and plug into the Down port. Check to see if that port comes back up. If it does then there is an issue with your wiring or it might be that your POE switch it only supporting enough juice for 1 of the cameras when it comes to night time when extra current is needed to support the LEDs on the cameras.

There is better solution then using the ATTE- X POE. I am sure there are some out there that it works just fine for. Yet some of them most likely are using extra power also from ATTE.. If the camera distance from the area when connected to cameras has a long enough service loop to pull wires to the cameras without having to pull new wires, I would wire the system using 2 pairs in the cat cable, 1, 2, 3 and 6 match to both ends and then using the next 2 pairs do the same again matching both ends. Now the camera can connect to their own port on the POE switch and no issues with the camera needing more power then the Poe switch wants to support.

There are cable splitters out there if you don't have crimpers for the RJ45 and the ends.. Many different ones offered at different cost points.. Personally look for the best not the cheapest. Using bad wires in the set just makes your systems weak point. But what it does it offers a T where if you look at it like this bottom of the T would be incoming from your switch. Top of the T out to cameras, at the other end where your switch is it is about the same thing. There is some systems that are not like that and are just pair of wires with female on 1 of the parts 3, on the other end 1 female and 2 males that would just plug in to the switch.. Only down side is again not knowing the quality of the product. If it is real copper or CCA and normally cost more then buying a crimper and a pack of RJ45 ends. However I did notice that the price has come down a lot in the last few years now there are more people offering the same type setup..
 
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Revo2Maxx said:
Here is what I would do, I know that it isn't a great thing, However need to work it out. I personally would remove the Down wire, reboot or power down and then power up the POE Switch. Once all the other cameras come online I would then remove one of the working ones that have all come back up, Unplug one wait 10 to 20 seconds and plug into the Down port. Check to see if that port comes back up. If it does then there is an issue with your wiring or it might be that your POE switch it only supporting enough juice for 1 of the cameras when it comes to night time when extra current is needed to support the LEDs on the cameras.

There is better solution then using the ATTE- X POE. I am sure there are some out there that it works just fine for. Yet some of them most likely are using extra power also from ATTE.. If the camera distance from the area when connected to cameras has a long enough service loop to pull wires to the cameras without having to pull new wires, I would wire the system using 2 pairs in the cat cable, 1, 2, 3 and 6 match to both ends and then using the next 2 pairs do the same again matching both ends. Now the camera can connect to their own port on the POE switch and no issues with the camera needing more power then the Poe switch wants to support.

There are cable splitters out there if you don't have crimpers for the RJ45 and the ends.. Many different ones offered at different cost points.. Personally look for the best not the cheapest. Using bad wires in the set just makes your systems weak point. But what it does it offers a T where if you look at it like this bottom of the T would be incoming from your switch. Top of the T out to cameras, at the other end where your switch is it is about the same thing. There is some systems that are not like that and are just pair of wires with female on 1 of the parts 3, on the other end 1 female and 2 males that would just plug in to the switch.. Only down side is again not knowing the quality of the product. If it is real copper or CCA and normally cost more then buying a crimper and a pack of RJ45 ends. However I did notice that the price has come down a lot in the last few years now there are more people offering the same type setup..
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Wow, what a detailed response. Appreciate it so much! Hope I'll have enough time this week to try suggested solution.

For sure will keep you posted what I was capable of and what worked if done.
 
I don't know if this will help or not. Thought I would show what I am talking about for the RJ45 ends. This is the 4 wires, aka 2 pairs I was talking about. It is a Straight through setup. One pair is send other is receive, I know it don't make much since when we are talking about POE, The thing is Data and Voltage that POE works with are at different modes. Picture is reflection of Mode A. How it works.. POE injectors or Switches Same wit h POE NVRs apply a DC Voltage between these pairs. The Ethernet Transformer inside the camera allows the device to separate the data signal from the power. The Transformer blocks the DC power component from interfering with the data while still allowing it to reach the camera.. Pins 1, 2 is Positive V+ and Pins 3 and 6 is Negative V- . Picture below would be to run 1 camera on POE. The other would be setup in same way just using the other 2 pair of wires the Blue and Brown pairs.. Again 1, 2, 3 and 6 being used in the RJ45 Connector.. That means 1 plug going to camera same color going to POE Switch then after wiring the next 2 pairs again 1 going to the camera and other end going to POE Switch no need for the ATTE-X- POE device anymore

PinOut.jpg
 
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