Opinion needed from expert: HDW4431EMP doesn't transmit on ethernet

GiovanniG

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HI! Before deciding if it's worth to try repair I would love to hear your opinions, thanks!

The camera powers on with PoE and 12V, the internal LED goes on, it reacts properly to the bright/dark condition, pressing the reset reacts too, keep pressing it looks to reset configuration (the internal led stay off longer).
The problem is that doesn't transmit data, I?ve connected it to a pc by a patch cord, the link on PC goes up, I turned on sniffer on ethernt but I don't see input packets, after hard reset it shuld reply to 192.168.1.108 but doesn't. This test was made powering camera with 12V.
When It was connected to the PoE switch, which unfortunatly I don't have here, the PoE led was on, half seconf after connecting cable, but the link was off, this is not normal.

I was thinking abou the problem of the ethernet PoE transformer, s16503 G, but I measured it with ohm meter and the coils seams ok, all of them report about 0,4ohm to the central tip, I was guessing to find one opened but not, integral. So I'm not sure if it is that, the faut device, I'm start thinking about the ethernet chip.
This camera was placed indoor in a lived apartment, perfect conditions with constant 25°, the only thing that may happen is a bad electric impulse which wasn't filtered by switch PoE, the transformer is the first device that could be hit by it, I supposed it will "open", can it be spoiled? Changing it is not expensive, I need to order on aliexpress, but it worths? I dubt a transformer may be spoiled, but the fact that lin gos up with 12v but doesn't on PoE switch makes me thing. Did you have the same experience?


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