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Rusty chokes on Asus mobo.

newtekie1

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How would humidity cause that?
The thing would have to have been sprayed by water to accumulate that much moisture.

Not really, it only takes a small amount of moisture to cause surface rust like that. If the factory's air conditioning broke for a few hours one day, that would be enough to let the humidity get high enough(depending on where the factory is located) to cause the surface rust. Despite what it looks like, there is actually very little rust there.


And have you ever tried breaking a choke? The iron is hard as rock, it's not a powder any more, despite being made out of iron powder (or ferrite powder as it might be in more expensive ones).
Besides, things like this should be manufactured in a controlled environment, so suggesting that the environment where the chokes were made was too damp is just silly.

Yes, I have tried, and succeeded at breaking a open a choke. The iron powder might be hard, but is still just compressed powder, and actually breaks apart relatively easy compared to a piece of solid iron. And when it rusts, due to the rusting process, the particles that rust expand and break themselves away from the others. Which is why the rust just comes right off with the laquer and sticks to the copper.

And, as I said above, it only takes the air conditioning to go out for a few hours for the factory to get too humid. And since these are the cheaper chokes, they aren't going to stop production because of it(probably won't on the more expensive either, anyone that has ever worked in a factory would probably agree).
 

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Despite what it looks like, there is actually very little rust there.

tiny little bit of rust in a very confined space, would blend with the water and create a rusty water solution - it'd make it look far worse than it really is (you're seeing water + rust in a film over the top of the choke, not solid rust)
 

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Rusty chokes on Asus mobo: part 2



The article states that the copper coil is "rusty", but notes that copper can't rust.

WE’VE HAD SOME criticism on our original story about the rusty chokes on certain Asus motherboards that got pointed out to us, so we decided to do a follow up. This time around we’ve done what many of the comments around the web have asked for, we cracked one of the chokes open to see what it looks like on the inside.

Many of those that read the story noted that the rust only seemed to be superficial and we agree that it was hard to tell where it came from, in part due to the clear coating on the chokes. We had one of the chokes from one of the 12-phase boards de-soldered as you can see on the picture below. The chokes are clearly labelled C.S and from what we’ve been told, this is a brand exclusively used by Asus on some of its motherboards.

It's not clear how much this will affect performance over time and it looks like the problem may not be as bad as it seemed at first. Many more pictures over at SemiAccurate.

SemiAccurate
 
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A new thread on the same subject isn't necessary. It has been merged with the original thread.

That indeed looks like some sort of corrosion.
 

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A new thread on the same subject isn't necessary. It has been merged with the original thread.

That indeed looks like some sort of corrosion.

Did you merge it once already? I got into a terrible editing muddle before trying to make links between the threads and ended up deleting the post of part 2 and the thread link had become invalid before I deleted it. :confused:

I had simply made a new thread so people would realise more clearly that there was a part 2 to this, but hey, no problem.
 
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That indeed looks like some sort of corrosion.

IDK - that looks like a solid-state unit, in which case, the "dust" on the core qould simply be remnant of the filling material.

I don't see any discoloration or tarnish of the actual copper, so I would say that there's nothing wrong with the core itself, nor would it be in danger of failing anytime soon. But, can't see the internals of the core, though.
 
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IDK - that looks like a solid-state unit, in which case, the "dust" on the core qould simply be remnant of the filling material.

I don't see any discoloration or tarnish of the actual copper, so I would say that there's nothing wrong with the core itself, nor would it be in danger of failing anytime soon. But, can't see the internals of the core, though.
I think simply the mass of the materials create the function of the product....

So most likely it just looks ugly
 

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The copper isn't even oxidizing. Just as a I thought from the beginning, it's superficial, and nothing but an aesthetic problem. Mountain out of a molehill.
 
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http://www.semiaccurate.com/static/uploads/2010/01_january/12p_chokes_WM.jpg

These chokes should look silver coloured.

Seems Asus has been a bit naughty with their quality control here. The best bit is that instead of pulling these mobos off the market, they are just dumping them at a lower price. Avoid at all costs.

I use Gigabyte Ultradurable mobos myself. ;)



SemiAccurate

EDIT: There's now a part 2 to this article.

This seems like little more than a hit piece on ASUS, no company is without QC, or design problems. An example of this is Mercedes Benz, they spend 10's of millions of dollars each year on QC and over engienering their cars, and they still have problems, I can personally attest to this fact as my Merc's engine block cracked after a mere 11k miles. There are 1,000's of individual pieces in computers as in cars and any one of them can cause problems.

So Meh.
 
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http://www.semiaccurate.com/static/uploads/2010/01_january/split_choke_5.jpg

The article states that the copper coil is "rusty", but notes that copper can't rust.



It's not clear how much this will affect performance over time and it looks like the problem may not be as bad as it seemed at first. Many more pictures over at SemiAccurate.

SemiAccurate

that copper was not exposed to moister some how,Copper turns like that if water gets on it,Then it turns green like a bad engagement ring.Maybe two things with this
1,the company supplying ASUS is hiring some bad untrained workers.
2,Some containment in the lacquer itself.

I don`t think ASUS is to be blamed they make boards not chokes.for all we know the choke`s look normal during the manufacturing and they rust or discolor after shipment.
 
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The copper isn't even oxidizing. Just as a I thought from the beginning, it's superficial, and nothing but an aesthetic problem. Mountain out of a molehill.
Welcome to the interwebz.
 
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The copper isn't even oxidizing. Just as a I thought from the beginning, it's superficial, and nothing but an aesthetic problem. Mountain out of a molehill.

i agree and has everyone voted in this poll :laugh::D
 
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If I was ASUS, I still wouldn't let those boards out in the "public"... maybe revert them to other things like the OEM market...

Other than that, besides aesthetics... it not a real big issue. The question SA is trying to ask is this-
Would you yourself put this in your rig if you bought that board w/o knowing this was a problem and you actually wanted that board?
 

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If I was ASUS, I still wouldn't let those boards out in the "public"... maybe revert them to other things like the OEM market...

Other than that, besides aesthetics... it not a real big issue. The question SA is trying to ask is this-
Would you yourself put this in your rig if you bought that board w/o knowing this was a problem and you actually wanted that board?

If it was cheaper with a full warranty, then yes.
 
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After looking closer at the 2nd article there is no issue. If there is, it's cosmetic at best. SemiAccurate is reaching for an audience yet again.
 
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After looking closer at the 2nd article there is no issue. If there is, it's cosmetic at best. SemiAccurate is reaching for an audience yet again.

Reaching is for sure, and the OP was dumb enough to take the bait, they loose more and more creditability every day, articels making unsubstantiated claims, using 1 flaw as an example and claiming it to be the norm. The only reason to read semiaccurate, is for a good example of how not to write tech articals.
 
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just found some update about these rusty chokes:

" ...potentially serious issue with certain Asustek Computer motherboards that could leave customers seeing their boards fail sooner than expected, and may even cause damage to other system components such as the CPU. ....

damaged or degraded chokes are unable to retain their charge which forces the MOSFETs to open more frequently. This causes the system to draw more power, reducing the overall efficiency of the motherboard while producing more heat, and increases the workload of other components – the MOSFETs, capacitors, and PSU – which over time could eventually lead to these parts failing also.
The result is a dead motherboard or PSU, and if the user is unlucky, whatever component lies beyond the capacitors, usually the CPU, could also get damaged.

High-quality chokes are made from ferrite, which doesn't rust, while motherboard makers may use cheaper chokes made from iron in their low-end and mid-range boards to reduce costs. This suggests that owners of Asustek's high-end boards aren't likely to be affected by this issue, but that still leaves the cheaper (i.e. the high-volume) segments potentially exposed, meaning Asustek could face a large number of RMA cases down the road."

http://www.digitimes.com/news/a20100122VL201.html
 

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just found some update about these rusty chokes:

" ...potentially serious issue with certain Asustek Computer motherboards that could leave customers seeing their boards fail sooner than expected, and may even cause damage to other system components such as the CPU. ....

damaged or degraded chokes are unable to retain their charge which forces the MOSFETs to open more frequently. This causes the system to draw more power, reducing the overall efficiency of the motherboard while producing more heat, and increases the workload of other components – the MOSFETs, capacitors, and PSU – which over time could eventually lead to these parts failing also.
The result is a dead motherboard or PSU, and if the user is unlucky, whatever component lies beyond the capacitors, usually the CPU, could also get damaged.

High-quality chokes are made from ferrite, which doesn't rust, while motherboard makers may use cheaper chokes made from iron in their low-end and mid-range boards to reduce costs. This suggests that owners of Asustek's high-end boards aren't likely to be affected by this issue, but that still leaves the cheaper (i.e. the high-volume) segments potentially exposed, meaning Asustek could face a large number of RMA cases down the road."

http://www.digitimes.com/news/a20100122VL201.html
They're full of it. It's cosmetic.
 
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If I was ASUS, I still wouldn't let those boards out in the "public"... maybe revert them to other things like the OEM market...

Other than that, besides aesthetics... it not a real big issue. The question SA is trying to ask is this-
Would you yourself put this in your rig if you bought that board w/o knowing this was a problem and you actually wanted that board?



Hell yeah, if it breaks it has a warranty anyway :laugh:
 

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damaged or degraded chokes are unable to retain their charge which forces the MOSFETs to open more frequently. This causes the system to draw more power, reducing the overall efficiency of the motherboard while producing more heat, and increases the workload of other components – the MOSFETs, capacitors, and PSU – which over time could eventually lead to these parts failing also.
The result is a dead motherboard or PSU, and if the user is unlucky, whatever component lies beyond the capacitors, usually the CPU, could also get damaged.


I completely agree . . . except that in this case, we're not talking about damaged or degraded choke internals - simply the outer casing, which does not affect how the choke will operate at all.

As has been pointed out, this is a cosmetic concern.
 

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I completely agree . . . except that in this case, we're not talking about damaged or degraded choke internals - simply the outer casing, which does not affect how the choke will operate at all.

As has been pointed out, this is a cosmetic concern.

perfectly summarized.
 
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Reaching is for sure, and the OP was dumb enough to take the bait...

Can we have this thread deleted as it seems to be little more than troll bate.

I'm not dumb and you need to stop being so rude, thanks. :rolleyes: If anyone is trolling now, it's you.

You do not make requests for threads to be deleted, especially not ones like this where a helpful poster like me is reporting a genuine motherboard defect to help people avoid buying a dud, ok?

If you read the SA articles properly, you'll see that SA reported an understandable concern over corroded/rusted chokes. To any reasonable person this indicates damage and likely failure and should be concerned. When they took the choke apart in the second article, they themselves said the problem doesn't look as bad as initially thought. I suggest your read both articles again with a little more objectivity.

Other sites reported this problem, too.

So, tell me, how are SA "reaching" here?
 
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Final warning. Stop pointing out one another in this discussion or the thread will be closed. If you cannot have a civilized discussion on the matter this thread will be closed. Any more reported posts on this thread and it will be closed. Everyone has a right to their opinion. You do not have a right on this forum to make your opinions known about another member that is hurtful in any way. Issue over. Resume on topic discussion.
 
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Someone needs to give rusty the Heimlich before he chokes on that asus mobo.
 
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