ASUS P4P800 Deluxe will not POST

[alky]

My computer has mysteriously died and it does not post anymore. I've removed everything except for the cpu, ram and video card but it is still dead even though the fans are running and the led on the motherboard is ok. The caps on the motherboard also look fine. Is there anyway to check if the caps are faulty without removing them?

[starfury1]

Re: ASUS P4P800 Deluxe will not POST

Well not much to work with but since no one else has posted yet

An ESR meter is what you need, it will not be 100% since caps are in parallel so you will still have to pull each to be sure of a dud
but if you find a high reading in the VRM
(then normal and that depends on what is normal)
you would replace all anyway.

Brand and type of capacitor plus how much use its had can be an indicator

Caps can fail without signs

Having said that

not familiar with failure with the MB
but I am taking it from what you said
"it was working fine then just wouldn't boot."

My thoughts are you got something wrong thats not caps on the MB, maybe psu.
(possible but doesn't seem that likely if thats what happened)

You need to now work out which block isn't working. MB RAM PSU etc

Memory I think can cause this failure as so PSU

So if you got a second system you can try these on or test these with
Better still known working parts you can swap out
(preferably an expendable one)

Not necessarily in this order but things to try are

do the usual Cmos thing (remove battery etc) re seat RAM Video card
Try a new supply remove ram see what happens

Some el-cheapo PSU's have been know to kill devices (like HDD MB) so you might be better to just try a known working one in your system.

If you got a multimeter and know how to use it check the voltages

Also it helps if you list what you got and how your running it and if there has been any flaky behavior before hand.

typical signs of failing VRM caps (or possibly psu) are windows freezing and rebooting
(not in all causes thought)

At this point try and work out which block has the issue PSU RAM MB etc
just beware a faulty device may take out something else
(mostly not but possible)

bottom line is there are a few possible causes

HTH

Cheers and Welcome

[fancypants]

Re: ASUS P4P800 Deluxe will not POST

I had the same symptom with my p4p800 deluxe. It happened intermittently at first upon reboot, fans would spin but no video, no apparent post. I could turn it off by holding down the power button and then it would start normally.
A couple weeks later it crashed while transferring files to my media player using one of the front usb connectors. A short while later it refused to boot, the green LED on the motherboard still lit up, but nothing else (known good psu and with just cpu, 1 stick ram, and video card installed).
Google found people describing similar or more severe symptoms who were attributing it to a latchup of their southbridge ich5(r) chip (example here ). In the severe cases the southbridge had a visible scorch mark, though mine did not.
I was able to get it to start again after clearing the CMOS, it ran fine for one day, then failed to boot the next.

Does any of this sound similar to what you are experiencing?

Does anyone think this could be due to bad caps? (all caps on my board appear to be made by United Chemicon)

[starfury1]

Re: ASUS P4P800 Deluxe will not POST

Hummm its possible I suppose faulty cap could have killed the chip
but mostly its the VRM caps that die first
So I am not putting that as likely cause of the failed chip
Sometimes chips just do fail and heat may factor into this
I've heard of problems with BGA type chips
(if it is one)

United Chemicon,
if you are talking about these, are fairly reliable and considered very good caps
(*there are fakes I read and not sure of series but second sourced, under license I think too)



Image from following thread (posted By willawake)
https://www.badcaps.net/forum/showthread.php?t=588

See this post also by Willawake on "Where can I buy replacement capacitors" or rather "what to buy"

On the KZG

KZG not recommended due to more fails

https://www.badcaps.net/forum/showthread.php?t=2280

(* maybe the above might explain this, dont know)

I've heard of cooked chipset chips

So maybe these MB's are prone to this type of failure?
Which basically writes them off I suppose.

So yeah sounds like a good possible too...dead chip on MB
(So you might be real unlucky and have a dead chip )
check it out for signs of heat or is it really cooking

Apart from it being a possible known issue with this MB
the others above are more the "food chain" of events

But if it is a known issue then its a fair bet.

Thanks for the input fancypants and welcome

Cheers

[fancypants]

Re: ASUS P4P800 Deluxe will not POST

In my case about 6-7 are KZG (6.3V, 1500uF positioned next to the cpu socket).

After another CMOS reset I got another few boots out of it (leaving the motherboard battery out for a day; I tried just a quick battery removal and using the reset jumper but that didn't work, so maybe it had more to do with sitting around for a day without power than the CMOS reset?) and then another failure (this time it crashed just after loading windows, tried to restart and then hung with the fans spinning and no video).

I already found a replacement board on ebay (different board), but if I can get another start out of the p4p800 deluxe, I think I'll give recapping it a try. Unless anyone thinks that would be an obvious waste of time.

Thanks for the info starfury1, I hadn't noticed that KZG have a higher rate of failure on my first read through the "good caps" thread.

Any news on your board Alky? I didn't mean to hijack your thread, just figured since we have the same board and similar problems... good luck!

[alky]

Re: ASUS P4P800 Deluxe will not POST

hi,

my board is still unable to post. think i will try to replace the capacitors on the board. anyway i've used it for 4 years already so i guess its time to change a new one if the cap replacement doesn't work.

the psu seems to be ok as i have another motherboard to test with. can't test the cpu or ram though cos it doesn't fit on my other board. will keep u guys updated if the cap replacement works or not.

[PCBONEZ]

Re: ASUS P4P800 Deluxe will not POST

KZG's go bad with no visible signs. - Need and ESR meter to actually check them.
Seem to go from good to bad quickly and hours of use matters less than age.
[I've had 4 boards with bad KZG's. - MSI, Asus, and Gigabyte.]

Chemicon has no history of bad caps before KZG's so no few people suspect them as a problem. (People say "the motherboard went bad, dunno why. I doesn't have any crap brands on it.")
Because of Chemicons good reputation KZG has ended up on ZILLIONS of motherboards. I expect to see them turning up bad in the forums more and more.

-

Bad caps in PSU's have been known to blow-out chipsets.

.

[kc8adu]

Re: ASUS P4P800 Deluxe will not POST

iirc asus has a 5 year warrenty.
might try to rma it.
caps are not the problem here.
likely a dead southbridge.

[ranmakuntruegod]

Re: ASUS P4P800 Deluxe will not POST

I had the same symptom with my p4p800 E deluxe.Check the 3 mosfet under the ram slots (Apm 2014N).try changing them with some 45N03LT
sorry for my bad english, i'm italian

[bgavin]

Re: ASUS P4P800 Deluxe will not POST

likely a dead southbridge.

What are the typical symptoms?

I have only had one bad Southbridge... hot as hell, so quite obvious. Other than over heating, simply dead?

I have a few Intel boards that are just dead. I recapped, they worked a short while, then dead. I'm not sharp on component level bug shooting, so I have to throw them out.

[fancypants]

Re: ASUS P4P800 Deluxe will not POST

I just wanted to update everyone on my p4p800 deluxe board.

I pulled a few capacitors and tested them with a multimeter, quite a few were coming up bad so I ended up replacing all of them... and the board has been working fine!

It's been about 3 weeks now, though I haven't given it a 'workout' yet it -- just installed an OS and some web surfing. I'll post back should it fail again.