Dahua PTZ Camera No Network Connection – HD-SD49225T-HN

I am contacting you regarding an issue with my Dahua PTZ PoE camera which no longer has any network connectivity.

Camera model: HD-SD49225T-HN
Age: Approximately 4 years
Installation: Indoor (balcony), no rain or outdoor exposure
Location: Tunisia

Description of the issue​

The camera powers on correctly:

• The motor runs and performs calibration
• Infrared LEDs turn on
• The camera powers up both via PoE (RJ45) and with a separate power supply

However, the camera has no network connection:

• It does not obtain an IP address
• It is not detected by Dahua ConfigTool
• Ping does not respond
• The web interface is not accessible

Tests already performed​

• Factory reset (multiple times)
• Direct connection to a laptop (no switch or router)
• Tested with several different Ethernet cables
• Tested with and without static IP configuration
• Tested using Dahua ConfigTool
• Re-terminated the RJ45 connector (cut and crimped a new one)
• Tested both PoE power and external power supply

In some cases, after a reset, the camera responds to ping 2 or 3 times, then becomes unreachable again.

Additional information​

• Firmware was updated via the web interface about one year ago, and the camera worked normally afterward.
• There is no burning smell and no visible damage.
• Ethernet port LEDs (green and yellow) are lit when connected.
• The camera was purchased new, in its original packaging.
• It was previously connected using a PoE RJ45 extension cable to a switch and a NAS server.

Given that the camera powers on correctly but the network interface does not function, I would appreciate any technical guidance or repair directions you could provide (for example: components to check, known failure points, or recommended tests).

Thank you in advance for your support and assistance.

Thanks for your response.

After the reset, I started a continuous ping to the IP 192.168.1.108.
The connection goes through a switch: sometimes the ping replies (I received 4 reply lines), then nothing at all afterwards. It stays like that.

I also tried to access the web interface while the ping was responding, but no success.
I even tested by connecting the device directly to my PC: same result.

Of course, I assigned a different static IP address to my PC, so there shouldn’t be any conflict

TonyR said:

So it would seem that there's no possibility of another device set to the same IP of 192.168.1.108........

Click to expand...

Of course, I assigned a different static IP address to my PC, so there shouldn’t be any conflict