Problem with DAHUA PTZ DH-SD59430U-HNI black screen random.

[misho]

Hello,

The problem with the IP camera is as follows. At first, the camera shows a normal image when it is first turned on (it has not yet warmed up that much). The room I am testing the camera in is about 25C.
Sometimes it can work for days, and sometimes after 20 minutes it starts to show a black screen. The clock and everything else works and it seems that the camera shutter is closed.
Once I was able to be present when this happened and right when the camera started to show a black screen, a strange noise was heard from the camera for a short time. It was as if the motor that controls the shutter was making a strange noise.
I tested it with both types of power supply. Through POE and through 24V. The effect is the same.
The fan inside works normally.
Camera model: DH-SD59430U-HNI
Firmware: V2.812.0000017.1.R, Build Date: 2024-07-04 (I tried other versions, but it behaves the same way)
PTZ Version: V2.301.0000000.3.RHNT_180331_26657 (I didn't find a newer one)
Network block camera CA-HZ4030U / P/N 1.1.03.07.10.489 (The battery on the board was about 2.3V)

I reset the factory settings several times.
I haven't unsoldered and measured the capacitance/esr of the capacitors on the PTZ board.
I saw that there is a temperature sensor on the PTZ board (PT1 - I haven't measured whether it is NTC or PTC and what its resistance is)
IR lighting is working normally.
I saw that the camera sensor is relatively easy to remove (3 bolts and a few clips), but I didn't dare because I don't know if dust will get in and what else could happen.
I couldn't find anywhere on the Internet whether the CA-HZ4030U is sold as a spare part. Only on eBay did I see that a seller sells the same one with a few other lenses and doesn't sell it separately. This module actually has everything, and the other board is for the PTZ control and power supply.
At this point I think the problem is in the camera shutter, but if anyone has encountered a similar problem I would be grateful to share.
If necessary, I can share photos of all boards and modules and their service numbers.
I am attaching two screenshots with the lights on and in the dark.
Thanks in advance!

 

[wittaj]

I hope by POE you meant POE+ as it takes more power.

That image looks like what I would expect indoors in a room - unless your room has walls 100 feet away, the starting focal length is higher on a PTZ, so it is zoomed in quite a bit.

Your image looks like what I would expect - zoomed in to a wall and all you see is the IR bounce off the wall.

Inside testing is good to make sure it works, but stick it out the window or take outside to truly test the capabilities of a camera.

 

[misho]

Yes of course POE+. It's currently on the workbench and the cable to the switch is 1.5 meters.
Look at the picture from that moment. I restarted the camera. The room is completely dark.

 

[wittaj]

Do you see the red infrared on?

 

[misho]

Yes. They work. All four infrared LEDs work.

 

[wittaj]

Post screenshots of your settings - it could be anything from too fast of a shutter to too low of gain.

And it would be more ideal to point it out to something more than a wall across the room.

 

[misho]

Okay Everything is default. It's the same during the day.
I could stick black tape over the infrared LEDs, but I don't think it would make any difference. Or I could turn them off in software or directly from the connector.

 

[wittaj]

But if you have light you see an image?

 

[misho]

No. It looks exactly the same.

 

[wittaj]

Interesting.

I haven't seen anyone report one failing like that.

@Revo2Maxx is our resident expert on taking these things apart and fixing them - have you ever seen this?

 

[misho]

Yes. I also read a lot before writing here, but I didn't find anything like it anywhere.
The only thing I'm thinking about is removing the back cover of the camera and leaving it running like that for a few days. To check if there will be a change. Because the camera is heating up. The stepper motor, which is for moving the camera up and down, is heating up quite a bit (about 45C ).
I'm starting to think about buying new capacitors and replacing them. Most of them are 220uf/16V.
I haven't looked at the capacitors on the bottom board, which is for rotating the camera.
Does this camera have to have one or two fans? Because I also see a second connector that says it's for a fan.