April 29

How to Fix Cisco Solid Green Syst LED light No Connection No Console

The Problem: 

I have a Cisco Switch 3750e. The Syst Led is solid green after reboot. It was working fine untill it was rebooted.

The Cause:

It is the hardware, the memory component.

http://www.cisco.com/c/en/us/about/supplier-sustainability/memory.html

http://www.cisco.com/c/en/us/support/docs/field-notices/637/fn63744.html

A temporary fix?

Open the case and remove the heat sink.

 

Use a hot gun to heat up the memory components for about 5-10 mins. This will “reflow” the solder connections on the chips.

Here is more info if you would like to read.

Heat gun GPU reflow fixes laptop

Good luck!

 

 

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Posted April 29, 2017 by Ray in category "Cisco

11 COMMENTS :

  1. By Brian Mack on

    MY MOST SINCERE GRATITUDE SIR THANK YOU.

    Was about to pull the trigger on eBay for another $400 switch when I found your post. Used the WIFE’s hair dryer for a minute or so with the heat sink still in place because I could not remove it easily.

    THANK YOU!

    Reply ↓
    1. By RayL (Post author) on

      Glad that works for you! Thank you for letting me know.

      Reply ↓
  2. By CeeAye on

    Hi,
    Did you heat up the memory chips while the switch was powered on or did you apply heat while it was off?

    Reply ↓
  3. By CeeAye on

    Hi,
    Did you heat up the memory chips while the switch was powered on or did you apply heat while it was off? I have a 2960 with the same issue and it started when I reboot the switch.

    Reply ↓
  4. By Tim on

    Wow, this actually worked. I just got a 3750 switch off eBay and when I powered it on, only the syst light would be on after post. I could not console to it at all. I removed the cover and used my wife hair dryer to heat up around the heat sinks for about 2 minutes, and hey presto the switch is now working. Thanks for the tip.

    Reply ↓
  5. By Kenneth on

    Tried this on a 3560G with similar symptoms. Doesn’t finish booting, all indicator lights green / amber, no output via serial connection.

    It working perfectly. Thank you!!

    Reply ↓
  6. By James on

    What is the primary problem chip the Flash next to the Yeti chip or the 4 other chips you point out?
    Thanks in advance

    Reply ↓
  7. By Dmitriy on

    Many Thanks!
    3750G is back to life.
    using a regular hair dryer for 2 min.

    Reply ↓
  8. By Sam Giotis on

    Hi this worked like a charm but it does not seem to last

    All the ones i thought i fixed are still having the issue

    Reply ↓

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