DAHUA NVR 5216 16P diagnosis please.

S

steve hollis

Young grasshopper
May 13, 2018
55
8
Hi everyone, need an urgent diagnosis of my DAHUA NVR 5216-16P-4KS2 please.

A couple of days ago, I noticed that none of my 11 cameras were being displayed on my tv having a long hdmi cable from one to another.

Went into the log and it stated that all cameras had disconnected at the same time. I suspected it could be the POE supply so I rigged up another 48v supply and low and behold, still plugged into the NVR, the camera came back online.

Before I could do any more the whole lot suddenly came back online.

Skip forward to tonight, the whole lot go off, do the alternative POE supply again, plugged in the camera works so knowing for definitely it’s the power supply, get my test meter and expect no volts from that part of the power supply but instead its showing a healthy 52v.

So where do I go from here? POE power is getting to the motherboard but not exiting from the cat connections or maybe the 52v disappears under load or something else.

If it is the power supply, where do you get another one in the UK quickly, I really can’t wait for a delivery from the Far East.

Any help pointing me in the right direction would be greatly appreciated.

Regards Steve
 
As per your suspicions, you should use your test meter to check under load.

Check pre and post NVR. You might have to make a "breakout jig" to test on the input (pre-NVR, power supply) side. A cut up cable will work on the output (post-NVR, camera) side.

Cheers, Steve
 
steve hollis said:
expect no volts from that part of the power supply but instead its showing a healthy 52v.
Click to expand...
It sounds like it might be an intermittent connection, or possible short circuit.
Manipulate the cable end while checking the output voltage, see if it changes.

I've seen some very poor soldering on the plugs of these type of power supplies, bare wires giving chances for short circuits, 'dry' solder joints coming off.
 
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Sounds like a short. Circuit board went into protection. BV-Tech POE switches have this feature.
 
steve hollis said:
Hi everyone, need an urgent diagnosis of my DAHUA NVR 5216-16P-4KS2 please.

A couple of days ago, I noticed that none of my 11 cameras were being displayed on my tv having a long hdmi cable from one to another.

Went into the log and it stated that all cameras had disconnected at the same time. I suspected it could be the POE supply so I rigged up another 48v supply and low and behold, still plugged into the NVR, the camera came back online.

Before I could do any more the whole lot suddenly came back online.

Skip forward to tonight, the whole lot go off, do the alternative POE supply again, plugged in the camera works so knowing for definitely it’s the power supply, get my test meter and expect no volts from that part of the power supply but instead its showing a healthy 52v.

So where do I go from here? POE power is getting to the motherboard but not exiting from the cat connections or maybe the 52v disappears under load or something else.

If it is the power supply, where do you get another one in the UK quickly, I really can’t wait for a delivery from the Far East.

Any help pointing me in the right direction would be greatly appreciated.

Regards Steve
Click to expand...
I once had a cam short out and literally melt the end and that POE NVR just kept cranking and never shut down or failed on the other ports, that port never fried either if that is any help, seems it never broke down or went into a protected mode, that being If you had a small used POE switch you could test say 4 cams at a time on it, If you do have serious short in any of your runs or cams it will not effect the rest of the system and vise versa. This would also test the recording end of the NVR, SAY 8 cams fail on the POE end of the NVR but the separate POE switch keeps going and your NVR is recording, then you would know what end of the NVR is failing.
 
Hi and thanks for these suggestions. I have checked the wiring, checked for dry joints and checked for anything else that looks out of place – but everything looks ok.

Point to note though, in my connected camera collection, I am using three SD52C225U-HNI which are PTZ and autotrack, and do take more power BUT I’m fairly certain they are well within the NVR limits and they’ve also been operating for 4-5 months all together now with no problems.

At the moment, ive got only 5 cameras connected and they seem to be working well and haven’t failed yet.

What I’ve done this afternoon, is ordered a 48volt generic switching external power supply rated at 250 watts as opposed to the internal Dahua one which is 130 watts I believe. I’m going to connect this in place of the existing POE lead and then I will plug in the offline cameras and see what happens


Regards steve
 
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