Identify bad caps and ferrite resistor

[davius]

Could I get a hand on identifying those caps? This is a 5 year old M4A88TD-V Asus motherboard. Even though the board IS working and I can work on this PC, its PCI-e lanes are busted and no external VGA works in it.

The PSU is a pretty decent Antec with 80 plus. Anyways, here's some pics on the caps. All of them exhibit this strange pattern on their sides, some more, some less. Also, I seem to get some corrosion on a ferrite resistor near the CPU socket.

[stj]

Re: Identify bad caps and ferrite resistor

a DECENT Antec is 50/50 - what model is it?
some have poor soldering or crappy caps.

the side of the caps may be aluminium oxidisation, and the inductor has surface rust.
neither should cause a problem.
so what's the history of this board, where did the moisture come from??

[davius]

Re: Identify bad caps and ferrite resistor

Wow! Thanks for the fast reply! The moisture must come from the environment of my city, since we're coastal corrosion is something quite normal here.

The PSU model is Antec Neo ECO 520W with 80 plus rating.

[Heihachi_73]

Re: Identify bad caps and ferrite resistor

Is the Antec PSU also 5 years old? They used to be known for putting Fuhjyyu caps in their stuff years ago.

[davius]

Re: Identify bad caps and ferrite resistor

Yes.... The PSU is from roughly the same time I bought and assembled this system (circa 2011)

[davius]

Re: Identify bad caps and ferrite resistor

But I must add, at least from the outside, the PSU is shiny new compared to the dusty PCB.

So, the images of the caps and the inductor does not inspire caution? I was positive that was some kind of leaking since on the bottom of those capacitors there's some accumulation of some sort of unidentifiable substance (as show on the images).

[RJARRRPCGP]

Re: Identify bad caps and ferrite resistor

They used to be known for putting Fuhjyyu caps in their stuff years ago.

That was from mostly 2000 to 2005...

They were notorious for Fuhjyyu caps during the socket 462 era, the socket 754 era and the socket 939 era...

They went to someone else likely since 2007 or 2006...

[stj]

Re: Identify bad caps and ferrite resistor

you need to check inside the psu,

the caps on the motherboard are solid polymer, there is nothing to leak out.

[davius]

Re: Identify bad caps and ferrite resistor

Right, just checked the PSU and it seems OK, nothing bulged or leaking at first sight. Pretty well made PSU I think.

[stj]

Re: Identify bad caps and ferrite resistor

looking at the motherboard again, if it was mine i would strip & wash it.

you dont know what corrosion may be hiding under the heatsinks or between chip pins.

[Agent24]

Re: Identify bad caps and ferrite resistor

I think you have bigger problems than the capacitors. Probably there is corrosion elsewhere, in critical areas. The PCI-E slot itself may be corroded inside or underneath.
The white stuff on the last capacitor photo might be some kind of reaction between the corrosion and the capacitor innards. Or just the capacitor body. Scrape it off and see if you find any holes underneath?

I agree with stj though, it needs a good bath, for starters. But I am not sure that it will help.

[davius]

Re: Identify bad caps and ferrite resistor

A good bath? You mean with water and stuff? Or isopropyl alcohol? Excuse my inexperience in this.

Will scrape underneath that capacitor to check for more clues and post here.

[stj]

Re: Identify bad caps and ferrite resistor

remove battery, cpu and all heatsinks & frames etc,
then throw it in the sink with boiling water & dish washing liquid and clean it with a paintbrush.
that's my method.

then rinse it well and shake off as much water as possible - specially out of the cpu socket.
then dry it completely - i use a fan heater, but a hair dryer or similar would work.

the trick is to dry it in an hour or less - not over several days, that way corrosion cant set in.

[davius]

Re: Identify bad caps and ferrite resistor

Thanks a lot for the explanation stj! Never in my life I'd think of cleaning a MB this way, but will do now! Really appreciate!

[stj]

Re: Identify bad caps and ferrite resistor

https://www.badcaps.net/forum/showthread.php?t=1463

[petehall347]

Re: Identify bad caps and ferrite resistor

it is best to rinse with distilled water if washing with tap water ..i use Isopropyl alcohol to finish off