Problema con Dahua ptz ip, ma non conosco il nome del difetto, aiuto, grazie

Bnmcorp

Bnmcorp

n3wb
Sep 20, 2024
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Italia
Ho praticamente da quasi un anno installato un impianto di videosorveglianza Dahua IP, ma su una telecamera ptz ho un difetto durante il corso della giornata, sarebbe gradito qualsiasi informazione, da come si vede nel video, l'immagine fa questo difetto, se servono altre informazioni e dettagli non ci sono problemi... Ho bisogno di aiuto, grazie
 

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I have practically installed a Dahua IP video surveillance system for almost a year, but on a ptz camera I have a defect during the course of the day, any information would be appreciated, from how you can see in the video, the image makes this defect, if you need other information and details there are no problems ... I need help, thank you
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Have you tried a hard reset of the camera?
What is the model number?

Hai provato a fare un hard reset della fotocamera?
Qual è il numero del modello?
 
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Is that happening during a transition period from say day to night or night to day? Something very similar happens to one of my cams at these times where the camera hunts between switching between day/night settings and can’t quite make its mind up.

If this is the issue then you can get around it by sending commands to the cam to force it into day/night on a schedule.
 
[CITAZIONE="TonyR, post: 877278, membro: 752"]
Hai provato a fare un hard reset della fotocamera?
Qual è il numero del modello?

Hai provato a fare un hard reset della fotocamera?
Qual è il numero del modello?
[/CITAZIONE]


No, questo no, non ancora, sto cercando di evitarlo, il modello è Dahua SD6C3425XB-HNR-A-PV1 4MP
 
[CITAZIONE="IAmATeaf, post: 877280, membro: 69210"]
Ciò accade durante un periodo di transizione, diciamo, dal giorno alla notte o dalla notte al giorno? Qualcosa di molto simile accade a una delle mie telecamere in questi momenti, quando la telecamera va a caccia tra il passaggio tra le impostazioni giorno/notte e non riesce a decidersi.

Se questo è il problema, puoi aggirarlo inviando dei comandi alla telecamera per forzare l'attivazione del modo giorno/notte secondo una programmazione.
[/CITAZIONE]


No, in pieno giorno. E solo di giorno
 
[CITAZIONE="Bnmcorp, post: 877250, membro: 209803"]
Ho praticamente da quasi un anno installato un impianto di videosorveglianza Dahua IP, ma su una telecamera ptz ho un difetto durante il corso della giornata, sarebbe gradito qualsiasi informazione, da come si vede nel video, l'immagine fa questo difetto, se servono altre informazioni e dettagli non ci sono problemi... Ho bisogno di aiuto, grazie
[/CITAZIONE]

Ma vorrei chiedere se potrebbe essere un problema di spinotti e giunzioni o ossido sui contatti...?? Potrebbe creare certi problemi?
 
The only thing that might be worth checking is the power requirement for the cam and what your switch can supply? Only thing I can think of if it’s happening during the day
 
[CITAZIONE="IAmATeaf, post: 877293, membro: 69210"]
L'unica cosa che potrebbe valere la pena di controllare è il fabbisogno energetico della cam e cosa può fornire il tuo switch? L'unica cosa che mi viene in mente se succede durante il giorno
[/CITAZIONE]

Puoi aiutarmi a capire se ti mando le specifiche? gentilmente... Questo e lo switch a cui e collegato solo due cam, quella in questione e questa Dahua IPC-HFW2841T-ZS 8MP
 
So you have asked about this camera in another thread.. To answer your questions on this camera. Yes the contacts can be an issue, How are you powering this camera? The camera requires POE+ and can work with 24vdc at 2.5amps.. plus or - 25% so that means that the camera can work at 18vdc to 30vdc.. So the issue could be Power supply if you are using the included power supply or I think it was,, If it was you need to make sure that you are powering the camera as close to it as you can so you don't get a large voltage drop..

Problem that people can have is they use a power supply that came with camera at home location and pull under sized wire to the camera. So lets say that your cameras location is 25 feet from the power supply. The power wire is only 5 foot long. That means that 20 foot of cable has to be ran to the camera.. For me and might be over kill, But I would run 16ga wire. not some cheap CCA but some real copper wire and because it is an alarm output camera I would maybe run 14ga wire just to be safe. Problem is that most of the junk people buy not knowing is CCA and that can act up with heat of the day or if the cable is ran in a hot attic..
 
Revo2Maxx said:
So you have asked about this camera in another thread.. To answer your questions on this camera. Yes the contacts can be an issue, How are you powering this camera? The camera requires POE+ and can work with 24vdc at 2.5amps.. plus or - 25% so that means that the camera can work at 18vdc to 30vdc.. So the issue could be Power supply if you are using the included power supply or I think it was,, If it was you need to make sure that you are powering the camera as close to it as you can so you don't get a large voltage drop..

Problem that people can have is they use a power supply that came with camera at home location and pull under sized wire to the camera. So lets say that your cameras location is 25 feet from the power supply. The power wire is only 5 foot long. That means that 20 foot of cable has to be ran to the camera.. For me and might be over kill, But I would run 16ga wire. not some cheap CCA but some real copper wire and because it is an alarm output camera I would maybe run 14ga wire just to be safe. Problem is that most of the junk people buy not knowing is CCA and that can act up with heat of the day or if the cable is ran in a hot attic..
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I had this problem and I asked for help in this post but it has nothing to do with the other one where I just want to replace it with another type DH-SDT6C432, the problem still remains, I have not solved it, to answer your questions; no, I do not use the power supply supplied with a poe switch that I bought on amazon, you can find all the info above; only two cameras are connected and at the beginning everything worked fine, then it started to do this defect.. this is what the technical sheet says
Power Supply:24 VDC, 2.5 A (± 25%) (included),PoE+ (802.3at)
 
Yes but keep in mind that data is with quality cables. I am not saying that you are not using pure copper cables but I have repaired my fair share of cameras that were connected to cat cable that was CCA. Most times with a camera like yours a high power POE PTZ would have killed it by now.. With it being a day issue it could be that the cable you are using is a high quality CCA cable and the issues that you have is related by the cable getting warm in the days heat? did the camera come with power supply when new? Some do and some don't so I don't know if this one did or if it was one of them ones that needed to buy if you wanted one? IF it did. I know not many people have a power source next to the cameras location but for testing it I would remove the camera from the POE switch and test it with the cameras Power supply even if you have to pull an Extension cable for the power. Keep in mind that can be tricky as well lol.. Don't want to pull a small cord for this because the power supply will want some good voltage and current from your power grid..

Another thing that it might be and if you have not tested it, I would change POE ports on your switch to see if maybe the issue is with your port.. Could be errors, dirty port, or many things. It is strange that the issue would be going still with what I seen in your video since Sept 2024 if it was CCA issue. Again could be a higher quality CCA that the camera is able to get most of the current it needs and has not damaged the POE PD circuit or POE Transformer as they can even with a lower current camera of mine new from box was letting my friend use while he was waiting for replacement, Just plugging the camera into his cable the camera powered on, and by the time we made it 100 feet to his monitor room the camera died lol.. It was very low current camera. But after that I found his CCA was in the attic and was very low quality.. If it was a PTZ camera would have not lived a second lol..
 
Revo2Maxx said:
Yes but keep in mind that data is with quality cables. I am not saying that you are not using pure copper cables but I have repaired my fair share of cameras that were connected to cat cable that was CCA. Most times with a camera like yours a high power POE PTZ would have killed it by now.. With it being a day issue it could be that the cable you are using is a high quality CCA cable and the issues that you have is related by the cable getting warm in the days heat? did the camera come with power supply when new? Some do and some don't so I don't know if this one did or if it was one of them ones that needed to buy if you wanted one? IF it did. I know not many people have a power source next to the cameras location but for testing it I would remove the camera from the POE switch and test it with the cameras Power supply even if you have to pull an Extension cable for the power. Keep in mind that can be tricky as well lol.. Don't want to pull a small cord for this because the power supply will want some good voltage and current from your power grid..

Another thing that it might be and if you have not tested it, I would change POE ports on your switch to see if maybe the issue is with your port.. Could be errors, dirty port, or many things. It is strange that the issue would be going still with what I seen in your video since Sept 2024 if it was CCA issue. Again could be a higher quality CCA that the camera is able to get most of the current it needs and has not damaged the POE PD circuit or POE Transformer as they can even with a lower current camera of mine new from box was letting my friend use while he was waiting for replacement, Just plugging the camera into his cable the camera powered on, and by the time we made it 100 feet to his monitor room the camera died lol.. It was very low current camera. But after that I found his CCA was in the attic and was very low quality.. If it was a PTZ camera would have not lived a second lol..
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So let me understand would it be repairable? I will try to connect its power supply (already in the package) with a flying cable, thanks for the advice, then I will update you. For the rest I would like to understand, so the AC cables are not suitable? I have already changed the POE ports.

I know I'm being pushy but thank you so much for all the help you're giving
 
So it's not easy to tell someone what an issue is only some ideas what might be an issue. Bad cables or ends. Bad ports or packet loss caused bt many different issues. Distance. So testing with power supply can help understand what might be the cause.
 
Revo2Maxx said:
So it's not easy to tell someone what an issue is only some ideas what might be an issue. Bad cables or ends. Bad ports or packet loss caused bt many different issues. Distance. So testing with power supply can help understand what might be the cause.
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okay as soon as I can in these days, I will try to connect its original power supply and I will let you know how it goes.
 
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Revo2Maxx said:
So it's not easy to tell someone what an issue is only some ideas what might be an issue. Bad cables or ends. Bad ports or packet loss caused bt many different issues. Distance. So testing with power supply can help understand what might be the cause.
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hi, yesterday I connected its original power supply with a flying cable, for the whole night but unfortunately the problem remains the same, at certain moments the camera has those unusual changes in brightness for no reason, thanks for the advice, today I will try to re-crimp the plugs as another attempt, also because I discovered thanks to you that unfortunately I am using a cca cable, unfortunately I did not know much about it until a few weeks ago and I was not aware of it...
 
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So have you reset the camera back to factory? Sorry I didn't read all comments and with this being such an old issue I mean I have reset some of my cameras 2 or 3 times since your start of this thread lol. Only because I do things to my settings that at times make things not work so well to try and help others that I just reset the camera back to factory to make it work as I expect..

Anyway with you connecting the camera to the Power supply I need to find out if you removed the power cord from the POE that you were using before? I ask because if you just plug in 24v to POE device that is designed to work with both it will run on POE until POE is remove then switch to 24v.. Not all cameras are this way and I don't know if yours is or not but if it is and you left it connected to POE then it was still running on POE..

If you did remove from POE and connected to a none powered Ethernet port for this test and running it off 24v had the same issue then it sounds like it could be heat related.. So I don't know for sure your camera type but I am going to guess that it will have a Heater and fan if not 2 fans in the system. Have you checked the cameras area while powered to see if you can hear a bad fan or maybe your camera has Fan info in its WebUI?

Problem is that you if in fact was running 24v and had the same issue then little to do with POE.. So this could be caused by any number of things even a dry solder joint. Now cable issue could be if these issue is in the normal heat of the day where the Ethernet cable being CCA is causing some heat in that but less likely the issue Does need to be replaced either way So here is some ideas of would could be and most of it require board level access and troubleshooting..

Failing DC-DC converters (common in warm environments).
BGA microfractures near SoC or RAM.
Failing input protection or filtering components (e.g., TVS diodes, caps that drift when hot).
Flash memory issues (rare, but temp-sensitive NAND can get flaky).
Heat-related Ethernet PHY instability, this would drop network connection intermittently.

Keep in mind that is as long as you are not running the camera on POE while being plugged in to the 24v power supply because you are not working on the Power supply would still be POE...
 
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Revo2Maxx said:
Quindi hai ripristinato la fotocamera alle impostazioni di fabbrica? Scusa, non ho letto tutti i commenti e, dato che si tratta di un problema così vecchio, intendo dire che ho ripristinato alcune delle mie fotocamere 2 o 3 volte da quando hai aperto questa discussione, lol. Solo perché a volte faccio delle modifiche alle impostazioni che a volte non funzionano bene, per cercare di aiutare gli altri, ho semplicemente ripristinato la fotocamera alle impostazioni di fabbrica per farla funzionare come mi aspetto.

Comunque, per quanto riguarda il collegamento della telecamera all'alimentatore, devo scoprire se hai rimosso il cavo di alimentazione dal POE che usavi prima. Lo chiedo perché se colleghi semplicemente un dispositivo POE a 24 V progettato per funzionare con entrambi, funzionerà in POE finché non rimuovi il POE, poi passerà a 24 V. Non tutte le telecamere sono così e non so se la tua lo sia o meno, ma se lo è e l'hai lasciata collegata al POE, allora funzionava ancora in POE.

Se hai rimosso il POE e ti sei collegato a una porta Ethernet non alimentata per questo test, e l'hai fatto funzionare a 24 V, hai riscontrato lo stesso problema, allora potrebbe essere correlato al calore. Quindi non conosco con certezza il tipo di telecamera, ma immagino che abbia un riscaldatore e una ventola, se non due ventole nel sistema. Hai controllato l'area della telecamera mentre era accesa per vedere se senti una ventola difettosa o se la telecamera ha informazioni sulla ventola nella sua WebUI?

Il problema è che se in realtà funzionavi a 24 V e hai avuto lo stesso problema, allora non ha nulla a che fare con il POE. Quindi questo potrebbe essere causato da qualsiasi cosa, anche da una saldatura secca. Ora, il problema del cavo potrebbe verificarsi se questo problema si verifica durante il normale caldo della giornata, quando il cavo Ethernet CCA causa un po' di calore, ma è meno probabile che il problema debba essere sostituito in entrambi i casi. Quindi ecco alcune idee su cosa potrebbe essere e la maggior parte richiede l'accesso a livello di scheda e la risoluzione dei problemi.

Convertitori CC-CC difettosi (comuni in ambienti caldi).
Microfratture BGA in prossimità di SoC o RAM.
Guasto dei componenti di protezione o filtraggio dell'ingresso (ad esempio diodi TVS, condensatori che si spostano quando sono caldi).
Problemi di memoria flash (rari, ma la NAND sensibile alla temperatura può diventare instabile).
Instabilità PHY Ethernet correlata al calore, che causerebbe l'interruzione intermittente della connessione di rete.

Tieni presente che questo vale finché non utilizzi la telecamera tramite POE mentre è collegata all'alimentatore da 24 V, perché non stai lavorando sull'alimentatore, che sarebbe comunque POE...
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unfortunately I left the camera with poe because I didn't know it would still use poe instead of power, and also because I didn't have a normal switch but only a powered one, Damn, I haven't reset the camera to factory settings yet, because I would have lost some settings and ivs rules that I'm bored of resetting at the moment, but I'll do it in the next few days, this is the model SD6C3425XB-HNR-A-PV1 4MP
 
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