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Posted 29 Feb 2012

Netgear GS108 - 8 Blinking Link LEDs - Can we fix it? Yes we CAN!

, 29 Feb 2012 CPOL
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Netgear GS108 8-port Gigabit switch is unhappy, only wants to blink.......blink no more!

Introduction





I was on a roll (I hoped), after successfully bringing back one of my dead switches to life, it was time to turn the attention to another dead switch I had. Can I make it 2 for 2?



On the ground floor of the house, I had another network switch, this was for things like the TV, appleTV, etc. and as a backup for my laptop in the event my wireless went belly up. One afternoon, nothing would connect, and all 8 Link LEDs just blinked in unison.



Background



78/netgear_gs108.jpg

The switch in question is a Netgear GS108, 8-Port Gigabit Switch.



I purchased it in April 2007, and it had served me well for 4 years before going on the fritz. It was originally purchased for £51 (UK Pounds), and today a replacement would cost £50.



Diagnosis



WARNING: This repair involved the use of a soldering iron, and care should be taken to avoid burns, etc. Also observe suitable anti-static procedures to reduce the risk of damaging electronic components due to static discharges.........and another thing, always unplug before opening, and if in doubt, do not attempt to open anything.


The problem was that the device would no longer allow any connections, or traffic to pass across its ports, the Link LED of each port would flash on and off in unison.



After unplugging the unit, and undoing the screws at the back, I slid of the cover and inspected internally. There was no dust accumulations, no evidence of burning, and things looked relatively okay.



It wasn't until I took a closer look at the PCB, I observed that out of the 5 capacitors, 2 of these had slightly domed by about 1-2mm compared to the others. I suspected that these two capacitors had died of old age or whatever. I thought it would be worth a shot at changing them, as I had nothing to lose, and if it didn't work after this, I was going to need a new switch anyway. The 2 capacitors that had swollen are circled in the image below:



78/swollen_caps.jpg

The capacitors were 1000uf 6.3v 105'C polarized, so a quick trip to my local Maplin store, I picked up some slightly higher voltage rated 1000uf 16V 105'C. Maplin part number DT69A and at a cost of £0.44 each. I chose a higher voltage rating, just for the sake of it really, as it won't do any harm.



Now, the switch is a low profile unit, and although the capacitors would have probably fitted in just fine, I decided to knock these over at an angle, just to be on the safe side.



Powered up the soldering iron, whipped out the old capacitors, and installed the new ones. Refitted the PCB into the case, and took it for a spin. Worked first time, no issues.



78/replace_caps.jpg

Good as new! Another worthwhile home repair.


Switch Original Cost: £51


Switch Replacement Cost: £50


My Home Repair Cost: £0.88



So if you have a Netgear switch that is displaying the blinky flash of death, then it may be worth checking out the capacitors.....[after I fixed this, I did a search on Google and found others talking about the same fault].



May the Soldering Iron be with you!



History




  • V1.0, 29th February 2012 - Copied to RootAdmin

  • V1.0, 1st June 2011 - First release (On CodeProject)


License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

DaveAuld
Engineer
Scotland Scotland
I have been working in the Oil & Gas Industry for over 25 years now.

Core Discipline is Instrumentation and Control Systems.

Completed Bsc Honours Degree (B29 in Computing) with the Open University in 2012.

Currently, Offshore Installation Manager in the Al Shaheen oil field, which is located off the coast of Qatar.

Prior to this, 25 years of North Sea Oil & Gas experience.

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Comments and Discussions

 
QuestionQuestion Pin
ledtech313-Aug-13 5:01
memberledtech313-Aug-13 5:01 
AnswerRe: Question Pin
DaveAuld13-Aug-13 5:20
memberDaveAuld13-Aug-13 5:20 
GeneralRe: Question Pin
ledtech313-Aug-13 5:49
memberledtech313-Aug-13 5:49 
GeneralRe: Question Pin
DaveAuld13-Aug-13 6:28
memberDaveAuld13-Aug-13 6:28 
GeneralRe: Question Pin
ledtech313-Aug-13 6:44
memberledtech313-Aug-13 6:44 
GeneralRe: Question Pin
DaveAuld13-Aug-13 8:42
memberDaveAuld13-Aug-13 8:42 
GeneralRe: Question Pin
ledtech313-Aug-13 9:04
memberledtech313-Aug-13 9:04 
GeneralThanks for the tip. Pin
SoMad5-Jan-13 18:38
memberSoMad5-Jan-13 18:38 

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