Bad P5P800S boards

[TerryG]

My company has built systems using the ASUS P5P800S boards. These systems run 24/7 and we used ASUS because we believed that they were good. Noooo..... We have now had 3 (yes 3) of them fail after about 12 months of use - i.e fail to boot or crash while running. All had bad 820mf capacitors. There was no consistent pattern to the failures other than they being 820mf. One board had 1 bloated cap. The other 2 had 3 bloated caps. I am now going to see just how good the ASUS 3 year warranty really is. I will keep you informed.

[willawake]

Re: Bad P5P800S boards

what is the brand/series of the caps?

[TerryG]

Re: Bad P5P800S boards

Thanks Willawake. The boards are in my office and with the Xmas holidays I wont be in until Wednesday. I can tell you that the mobo's have two types/series/brands of caps (black and green). All the failures have been green.

[TerryG]

Re: Bad P5P800S boards

The capacitors are green 820uf 6.3v 8mm. They have the following markings - MB 105C(M), 4715D and an eliptical logo that reads LTEC. I hope that this helps.

[TerryG]

Re: Bad P5P800S boards

We have another bad P5P800S MB. That makes 4 now.

[gonzo0815]

Re: Bad P5P800S boards

Sounds like traditionall badcaps again. Can`t understand why Asus dammages their reputation by sutch obviousely silly deals.
The 820uF valued caps are usually only used with solid polymer caps.
May be there was a very very clever beancounter at work wich thought that elektrolytics would be far cheaper than the solid ones.
may be the boards are OEMed by one of the cheapies out there.

[kc8adu]

Re: Bad P5P800S boards

real common failure.
i get lots of these in for recapping.
those cheap caps wont last in these hot systems.
i have seen ltec,elite,and yec on these.

[linuxguru]

Re: Bad P5P800S boards

It's clearly a mis-application of a low-valued electrolytic in place of a polymer - those should have been 1500uF or higher. Ltec isn't the worst out there - AcBel uses/used Ltec in their PSUs, so they must be OK. However, a fair number of otherwise reasonable series (Nichicon/Taicon HD, Chemicon KZG, an occasional Rubycon MBZ, Fujitsu polymer, ...) have been failing under high temperature, high ripple-current conditions like that found on the Vcore VRM output rail.

[linuxguru]

Re: Bad P5P800S boards

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[gonzo0815]

Re: Bad P5P800S boards

A VRM is far more demanding then an usuall PSu, i would say it is not even comparable. This is simply a to low rated cap in a demanding position, but shure the only reason was obviousely to skimp down a few pennies.
I do not say, that Ltec is absolut crap, but no way that it will survive on an skimped down BOM VRM like usuall today.

To be honest, in my PSU i would not want Ltec caps ;-)

And in the end, the whole badcaps story is always based on the need to skimp a few pennies and some badcaps provider who accept to make this shit that ass cheap that even they earn some money.

If it was an engineer who made this decision, than he was either braindead or he was clueless how to compete with Asrock or ECS without a complete new desinged el cheapo layout.