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Author Topic: Repairing a switch ?  (Read 988 times)
Sakarias-Corporation (OP)
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May 04, 2015, 10:47:45 PM
 #1

i just got a HUGE switch from my friend which he didn't need anymore, but once i plunged it in, smoke went out and a high ''blow'' sounded.

do you think that it might just be the transformer inside it ? and i can repair it ? or is it completely Dead and beyond reapir

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May 04, 2015, 10:58:28 PM
 #2

i just got a HUGE switch from my friend which he didn't need anymore, but once i plunged it in, smoke went out and a high ''blow'' sounded.

do you think that it might just be the transformer inside it ? and i can repair it ? or is it completely Dead and beyond reapir

What kind of switch? Network switch? Electrical switchgear?

I would advise carefully looking inside if you are comfortable with electrical safety and disassembly. You'll want to look for capacitors with tops that are punctured or "blown", burnt parts, and other inconsistencies.

Assuming this is a network switch, if you are lucky the damage will be localized to the fan/power module. At least on Cisco Catalyst, these are readily replaceable (although I do not doubt other models support replacing them as well).

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Sakarias-Corporation (OP)
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May 04, 2015, 11:06:06 PM
 #3

i just got a HUGE switch from my friend which he didn't need anymore, but once i plunged it in, smoke went out and a high ''blow'' sounded.

do you think that it might just be the transformer inside it ? and i can repair it ? or is it completely Dead and beyond reapir

What kind of switch? Network switch? Electrical switchgear?

I would advise carefully looking inside if you are comfortable with electrical safety and disassembly. You'll want to look for capacitors with tops that are punctured or "blown", burnt parts, and other inconsistencies.

Assuming this is a network switch, if you are lucky the damage will be localized to the fan/power module. At least on Cisco Catalyst, these are readily replaceable (although I do not doubt other models support replacing them as well).

Here's some pictures, i'm mainly interested and only if the switch has some kind of value, i'm very comfortable with repairing it my self. i'm no pro but i've been repairing lots of Technical equipment's such as Miners, Transformers, and such.
would this switch be worth anything fully working ?




Sakarias-Corporation (OP)
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May 04, 2015, 11:06:34 PM
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the black thing on the second image is dust if you're wondering.

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May 04, 2015, 11:22:25 PM
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the black thing on the second image is dust if you're wondering.

I'm not really sure about value, to be honest. It's up to you based on cost, market value, and specs. I would just crack it open and see where the damage might lie, and whether it's a module that can be removed or replaced.

Anyway, you could pull the module marked WS-X2924-XL-V over ports 5X to 16X. It might be useful or resellable fibre interface module (although I am not 100% sure).

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Sakarias-Corporation (OP)
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May 04, 2015, 11:37:44 PM
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the black thing on the second image is dust if you're wondering.

I'm not really sure about value, to be honest. It's up to you based on cost, market value, and specs. I would just crack it open and see where the damage might lie, and whether it's a module that can be removed or replaced.

Anyway, you could pull the module marked WS-X2924-XL-V over ports 5X to 16X. It might be useful or resellable fibre interface module (although I am not 100% sure).

i opened it up, and it looks like only the transformer got broken. everything else looks good

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May 04, 2015, 11:41:47 PM
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Do the specs say it's for a different electrical standard?

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Sakarias-Corporation (OP)
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May 04, 2015, 11:44:02 PM
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Do the specs say it's for a different electrical standard?

no it did not, now that i look at the transformer, i can see that i've seen this lots of times when i used to run miners at home.
as i said, the transformer is blown. but the rest is working. is it worth Switching the transformer to a new one and try to sell it ? or just sell boards separate ?

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May 04, 2015, 11:47:29 PM
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Do the specs say it's for a different electrical standard?

no it did not, now that i look at the transformer, i can see that i've seen this lots of times when i used to run miners at home.
as i said, the transformer is blown. but the rest is working. is it worth Switching the transformer to a new one and try to sell it ? or just sell boards separate ?

What you could do is look into the spec for your transformer, and see if there is a replacement that could be put in, on ebay or maybe here on the forum. I don't really have the specific knowledge to tell you which spec, unfortunately.

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May 04, 2015, 11:48:17 PM
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The Cisco 2900 XL series is painfully outdated... they're not even GigE capable (well, there are GigE modules you can plug in, but your module is a 100BASE-FX module). If memory serves, they also don't have per-VLAN bridging tables, which can be a very confusing cause of problems in certain setups.

IOW... I don't mean to be rude Sad, but this thing is pretty much worthless. It'd probably cost you more in just power to keep something like this plugged in for a year or two than to just buy a new or lightly used cheap 24-port switch in its stead.

(also, this is quite off-topic for this subforum....)
Sakarias-Corporation (OP)
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May 04, 2015, 11:53:20 PM
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Still trying to figure out on how to remove the Transformer



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May 05, 2015, 01:23:15 PM
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The Cisco 2900 XL series is painfully outdated... they're not even GigE capable (well, there are GigE modules you can plug in, but your module is a 100BASE-FX module). If memory serves, they also don't have per-VLAN bridging tables, which can be a very confusing cause of problems in certain setups.

IOW... I don't mean to be rude Sad, but this thing is pretty much worthless. It'd probably cost you more in just power to keep something like this plugged in for a year or two than to just buy a new or lightly used cheap 24-port switch in its stead.

(also, this is quite off-topic for this subforum....)

Like he said the 2900 series if you're looking to repair it for value as you suggested is not worth the time.  They can be purchased all over the place for well under $50 USD working.
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May 05, 2015, 05:26:14 PM
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They can be purchased all over the place for well under $50 USD working.

Also, much better alternatives can be purchased for about the same....
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May 05, 2015, 05:32:48 PM
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My first thought about the blow sound was to wonder if it was a capacitor outgassing? I did not see any that looked shot in the photos, but you may want to look and see if any of them are puffed up or had their tops blown off.

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May 06, 2015, 01:16:43 PM
 #15

I had a bunch of the newer models that never sell or sell for very little. Maybe thats why you got it. Smiley
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