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Old 10-20-2018, 09:33 PM   #1
pfrcom
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Default UniFi Switch 24 250W power supply

This is inside a UniFi Switch 24 250W - quality power supply, all Rubycon

Unfortunately it doesn't power on - no reading on the 48V and 24V going to the main board

Is the black shrink-wrapped thing shown in the second pic a fuse?

It's denoted FDG1, doesn't show a Ω reading on my UT-61E
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File Type: jpg Unifi_US-24_1of2.jpg (108.3 KB, 21 views)
File Type: jpg Unifi_US-24_2of2.jpg (97.3 KB, 24 views)
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Old 10-21-2018, 03:05 AM   #2
Per Hansson
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Default Re: UniFi Switch 24 250W power supply

No as you can see it's connected to the chassis ground.
The fuse is further down on the right in the same photo, heatshrinked standing up marked F1.
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Last edited by Per Hansson; 10-21-2018 at 03:07 AM..
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Old 10-21-2018, 08:12 PM   #3
pfrcom
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Default Re: UniFi Switch 24 250W power supply

Quote:
Originally Posted by Per Hansson View Post
fuse is further down on the right in the same photo, heatshrinked standing up marked F1.
Thanks Per

I must be getting too old for this stuff - or too keen for it to be a fuse problem

There's also an F2 near the F1, out of the pic

Anyway, both fuses are open, but that's the least of the problems

This is what I found underneath the PSU PCB







This is the end of the road for the switch - even if UniFi PSUs were readily available, there's no guarantee that failure didn't fry the switch electronics
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File Type: jpg Unifi_US-24_3of5.jpg (209.9 KB, 36 views)
File Type: jpg Unifi_US-24_4of5.jpg (178.4 KB, 37 views)
File Type: jpg Unifi_US-24_5of5.jpg (142.2 KB, 37 views)
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Old 10-22-2018, 10:42 AM   #4
Per Hansson
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Default Re: UniFi Switch 24 250W power supply

Did a search for EA18363 and this came up as the second hit, quite interesting / disconcerting

https://community.ubnt.com/t5/EdgeSw...w/td-p/1747440

There is a link on the third page to a Youtube video showing components without the black magic smoke over them, to help in component identification.
I'd offer to help you fix it but seems you are a bit ways off, always wanted to go to Australia though, hmmm
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Old 10-28-2018, 10:54 AM   #5
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Default Re: UniFi Switch 24 250W power supply

I'd be interested in seeing someone fix one of these.
I know of quite a few in service, so it's a bit concerning. Shame your switch is a few thousand miles away, else I'd have a go.
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