SG200-50P POE not working

[whatever2]

Hey guys,

I have a SG200-50P that I bought used. Yesterday I finally wanted to migrate all of my infrastructure to it. I connected a door phone (Fanvil i10, not that it matters) to it. It powered up (POE) and got an IP. So all working. But it was in the wrong VLAN, so I started playing around (voice VLAN etc.).

The situation now is that this thing is not powering up at all. Similarly, when I plug in a unifi AP, it also does not power up. Both the doorphone and the AP are powering up on a Zyxel switch.

The switch works, the GUI works, VLANs work, everything works, just not POE.

So now the question is: Why did it work? And what does this mean? Is the POE stage of the PSU fried? What should I do now? My next action would be to open this up and measure if I get the -48V of POE on the PCB. Any other things I could try?

One more  thing: I did change the fans on this thing. The new fans do not register properly (as in "Fan fail" error). I have never really used this switch after the change (only power it up for a couple mins). The fans spin, but the switch doesn't know that.

Could that be a reason? As in the switch shuts down the POE stage b/c the fans are not working?

Thanks for any comments / solutions.

Best,

Aleksander

[balaji.bandi]

we are not sure what is wrong here ? what does the Log shows ? (this is key part to identify the issue:

also chek show power inline what is the power avaiable ?

if that worked before there is no reason i see not work again, until we see any logs here ?

[whatever2]

There wasn't anything related to that in the logs. There's no CLI on the SG200, so I can't run that command, but the GUI showed 180W available. 

I will do some more tests and provide the logs as well Thu/Fri.

[balaji.bandi]

Applogies, yes that is lower model, may be turn off switch and turn on - test different ports.

also disable any smart port option.

[whatever2]

So... today I came back home. I plugged the switch again into the network and realized I forgot to unplug it from power. I plug in the doorbell and want to make screenshots of the logs. And the doorbell lights up and then boots up. I literally did not change ANYTHING, as I wasn't home...

In case it will fail again, I will come back with screenshots of the logs.

Thanks!