I hope this will help others like me, who had these damaged switches on their Home Labs. That is the purpose of this info.

Ciscom :

Ciscom :

I encourage you guys an whoever read this to open your switch and see for yourselves the bloated capacitors, of course if you doesn’t have a SMARTNET, it wouldn’t be smart to open your device though.

What I wanted to say, IF you have a SMARTNET, DO NOT DO THIS…Open a ticket with Cisco, otherwise you will be VOIDING your Warranty/Contract.

Thanks

This sounds exactly like what the issue was…

I did not bother opening it up since I had SmartNet on it and could simply get Cisco to ship me a new one.

There was a spate of bad capacitors a while back (having to do with bad gel in them). I suspect this is related…

-Eric

Ciscom :
Hi Guys, I’m from Puerto Rico and had the same problem at the company I work for.
Symptoms: C3750G-24TS Reliable switches that once unplugged they died. Some of them were DOA other turned on but as a “brick”.
NOTE: This DOES NOT affect the WS-C3750G-24TS-1u and later generations switches. Only the “thick ones” (1.5 rack unit).
Problem: Bad Capacitors.

I wanted to say that if you have SMARTNET, open a ticket witch Cisco. Never do this type of troubleshooting if your devices are in Warranty, otherwise you will VOID it.

Reason: A batch of these switches were manufactured with capacitors which lifespan is 50,000 hours. So if you happened to have one of these switches manufactured on 2004…Do the match. On 2009 when this forum was last updated, 5 years has passed or 50,000 hours. Capacitors failed and so your switch.
This not a defect thing. It’s just the type of capacitors they used to manufactured these switches doesn’t last as much as 5 years. I’m not sure if Cisco is aware of this, but they will not recognize this either.
I lost at my company 11 switches. I replaced the capacitors on the few I needed and brought them back to life, for at least 5 more years…hehehe.
I encourage you guys an whoever read this to open your switch and see for yourselves the bloated capacitors, of course if you doesn’t have a SMARTNET, it wouldn’t be smart to open your device though.
Now, how to solve this?? Get them to an electronic repair store and have those capacitors replaced. Have them check the Power Supply too. Or you can do it for your selves, if you know your electronics basics will suffice.
NOTE: You won’t find this info on the Internet. I think I’m the first one to really take the time and post it.

Symptoms: C3750G-24TS Reliable switches that once unplugged they died. Some of them were DOA other turned on but as a “brick”.

NOTE: This DOES NOT affect the WS-C3750G-24TS-1u and later generations switches. Only the “thick ones” (1.5 rack unit).

Problem: Bad Capacitors.

Reason: A batch of these switches were manufactured with capacitors which lifespan is 50,000 hours. So if you happened to have one of these switches manufactured on 2004…Do the match. On 2009 when this forum was last updated, 5 years has passed or 50,000 hours. Capacitors failed and so your switch.

This not a defect thing. It’s just the type of capacitors they used to manufactured these switches doesn’t last as much as 5 years. I’m not sure if Cisco is aware of this, but they will not recognize this either.

I lost at my company 11 switches. I replaced the capacitors on the few I needed and brought them back to life, for at least 5 more years…hehehe.

I encourage you guys an whoever read this to open your switch and see for yourselves the bloated capacitors, of course if you doesn’t have a SMARTNET, it wouldn’t be smart to open your device though.

Now, how to solve this?? Get them to an electronic repair store and have those capacitors replaced. Have them check the Power Supply too. Or you can do it for your selves, if you know your electronics basics will suffice.

NOTE: You won’t find this info on the Internet. I think I’m the first one to really take the time and post it.

It worked perfectly!

I came home and fell asleep on the couch playing with my new switch while watching my training videos. Here’s where things went south…

I woke up in the morning to no response in putty and looked at the switch and noticed no lights on. I could hear the fan still turning.

I pulled the plug and powered it back up. All the lights on the left come on, they all go out, then the top light (SYST) blinks twice, then everything is dark. I can still hear the fan running.

I left it unplugged all day hoping that when I returned this evening that it would power up properly. However, no such luck.

1. Do you think it’s a power supply or a board issue?

2. If I were to purchase a smartnet contract on it, would I then have it covered under a hardware warranty?

Thanks in advance for your time and consideration.

Your friend in Virginia,
Paul