linksys srw224p bad caps

[clearchris]

So, after I think I smoked a mb replacing the caps, I figured id stop in before working on this (different) one. Its a 24 port POE 10/100/1000 switch. It has been acting funny for a while, dropping links, especially when hot.

I take the over off, and what do I see?
Bad caps, bad caps starting right at me.





Can't say I have seen a small cap blow debris out the top, first time for everything.

So, upon closer inspection, they are the infamous KZG caps. The values are 10v at 1000uf. I have some room to work with so normally id upsize them to 16v or so.

Anyone have a cap model to suggest for replacement?

I have been doing these replacements with a corded cheap 30w iron, but if you guys think, ill upgrade to a pid controlled station.

Thanks!

[mariushm]

Re: linksys srw224p bad caps

Panasonic FM or FR will work just fine. Yes, it wouldn't hurt going up to a 16v rating.

Those boards are simple enough and the pads should be large enough that you should have no problems soldering with a cheap iron.
If you can afford to spend 60-80$ on a soldering station, you should, it can probably last you a lifetime and makes repairs much easier.

Even this rebranded Atten is way better than a 30w iron : http://www.newark.com/tenma/21-10115...60w/dp/56T2208

[clearchris]

Re: linksys srw224p bad caps

How about nichicon HZ or HN?

Im trying to buy something from here if possible.

[mariushm]

Re: linksys srw224p bad caps

HZ is ultra low esr, it's overkill. And the case is small, the capacitors are near inductors, there's not enough ventilation, you're just going to kill the HZ capacitors in time.

HN is in the KZG range esr/ripple wise and better than fm or FR by just a bit, but again the fm or fr series will work just as well and those have higher lifetime rating. But if you have HN in stock then use them if you want to.

edit: you can find panasonic fm or fr series capacitors everywhere... digikey, mouser, newark they all should have them, and they're all in US. HZ and HN are discontinued by Nichicon, so eBay stuff is either old stock or fake.

Something new and suitable from Nichicon would be HW, which is better than HE but not as good as HM/HN/HZ (all discontinued) or FM/FR series from Panasonic

Also check the badcaps.net store, there should be 1000uF 16v stocked by Topcat,

[clearchris]

Re: linksys srw224p bad caps

Thank you!

Heat is definitely an issue, the closet (aka my office), sometimes reaches 100F. I suspect that's what fried it in the first place.

[clearchris]

Re: linksys srw224p bad caps

My hakko 888d arrived. After some tuning, I have to say, swapping caps is almost fun.

The stand is ceramic, everyone complains about it being plastic, but its not. At least not the one I received.

Switch is back on the network performing its duty, but its cold, so id expect it to work. It wont be until the first really hot day that Ill know its fixed for sure.

Ceramic smd :


Fresh electrolytics upsized to 16v: