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Mosfet Heatsink Came off, Massive vdrop as a result.

post #1 of 8
Thread Starter 
Prepare to laugh at my misfortune (I would).

I was putting all my parts into my new case and I pressed the CPU heatsink down hard enough to where the clip on the mosfet heatsink was forced out and I didnt notice at first.

I was Priming to make sure everything was still stable and noticed a HUGE vdrop from 1.524v to 1.09v WOOOOO - I immediately shut down and opened my case to find the mosfet heatsink that had come off on one side and was sorta tilted 45 degrees as the remaining clip spring was still pulling it down from one side. I clicked it back in and ran prime95 small FFT for 13 hours and the problem seemed to have gone away, CPUID didnt report any vdrop like that anymore so I rejoiced.

Today when running Prime95 blend I noticed that same vdrop for a couple of seconds that didnt crash prime but this is definately a problem I didnt have before. asdfghj. Under CPU wattage for "Powers" under CPUID hardware monitor it goes from 117.60watts down to ... 16! It happens every 30 minutes or so.

It seemed to be fine while gaming for 5 hours today so it should at least last till I can buy a new mobo in a couple of weeks.

I reseated the mosfet heatsink with the same old thermal pad and am Priming again to see if that did the trick but if that doesn't work should I just give up on this motherboard?

Other Details:

-8 pin CPU plug is connected using an extension that came with HAF 932
case.
-problem never occurred until hardware was transfered into this case
-PSU is brand new, when the vdrop occurs the 12v, 5v and 3.3v stays well within specs, 56A@12v rail is plenty
-PSU was also used in my old case where this problem did not occur.
-PSU wires are ziptied down very tight, maybe one of the bends is causing some current loss?
-CPU temps never go over 54c in prime95 blend/small FFT

If all comes to worse should I try remounting the mosfet heatsink using some non conductive/capacitative thermal paste? I don't have any thermal pad/tape available to use.

This motherboard was super cheap, I probably wouldn''t go through the hassle to RMA it but rather buy a high end mobo if I can't manage to fix it. I'm totally down to solder stuff if needed but I don't have much experience with a multimeter, I've just picked up soldering from my dad from back in the 90's. I do have a multimeter tho..
Edited by Scorpion667 - 12/30/10 at 11:57pm
    
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post #2 of 8
My 2 cents: a heatsink coming off can't possibly affect the voltage given by the PWM, unless:
*something may be shorting
*something else got damaged in the process, check caps and all contacts, you should remove the motherboard to have a clear picture.

Since most of the time the motherboard provides stable Vcore it can't be that badly damaged, and since the processor is stable despite those Vdrops, they may be nothing more than measurement error. A processor fully loaded at full speed can't possibly maintain stability @1V even for a fraction of a second.
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post #3 of 8
Thread Starter 
It no longer drops vcore after reseating mosfet heatsink and motherboard. Maybe you are right, could of just been my motherboard that was flexing so the mosfets weren't fully flush with the heatsink idk

I'll leave Prime running for another 6 hours or so.

[edit] Hmm, I put the side panel when prime was running and i tapped it right around where the 8 pin PSU cable meeds the extension on the cable management side and it vdropped to 1.09. I removed the extension and ran the PSU cable under the video card to see if this does it sigh [/edit]
Edited by Scorpion667 - 12/31/10 at 6:26am
    
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post #4 of 8
Quote:
Originally Posted by dragosmp;11839566 
My 2 cents: a heatsink coming off can't possibly affect the voltage given by the PWM, unless:
*something may be shorting
*something else got damaged in the process, check caps and all contacts, you should remove the motherboard to have a clear picture.

Since most of the time the motherboard provides stable Vcore it can't be that badly damaged, and since the processor is stable despite those Vdrops, they may be nothing more than measurement error. A processor fully loaded at full speed can't possibly maintain stability @1V even for a fraction of a second.

WHAT???????? More heat = unstable in anything when it comes to computers.
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post #5 of 8
Its mobo problem .I also facing problem with M4A88TD-M Evo/Usb3. I tested my cpu on My friend's Gigabyte GA-88GM-UD2H . No problem like vcore drop, multi drop ,Watt drop.
post #6 of 8
Quote:
Originally Posted by dixson01974;11841054 
WHAT???????? More heat = unstable in anything when it comes to computers.

Especially MOSFETs, which are VERY prone to thermal runaway...and as the get hotter, their electrical output becomes more and more unreliable.
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post #7 of 8
Thread Starter 
So I tested the system at stock and did 20 hours of prime blend no problem. COnsidering this problem only happens when the system is overclocked, is it safe to assume that the motherboard is the problem? I don't want to buy a crosshair iv and have the same problem lol.

Maybe some of the as5 paste got on one of the pins... but the problem caused by that would be much more desastrous and the system wouldn't even be stable at stock settings.

There's no physical damage on the board, i looked very closely. This really sucks, I might just go with sandy bridge and sell this phenom II.

On the bright side, I was gaming on it overclocked all day, it only vdrops in prime.
Edited by Scorpion667 - 1/1/11 at 9:33pm
    
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post #8 of 8
i also have this problem with an Asus M4A88T-M drooping like mad. Theres no heatsinks on the mosfets at all. With an overclocked B60 running P95 and checking with HWMonitor and speedfan's voltage graph output, The vcore jumps up and down anywhere from 1.375-1.460 sporadically and maybe every two seconds Dips to 1.008v and puts my cpu to 800mhz.... I know its not cool n quiet or any power saving feature.

The psu isn't bad as i tried it with a Gigabyte MA785GMT-UD2H. Speedfan showed a STRAIGHT line and no fluctuation when overclocked running Prime95. HWMonitor's min and max readings were the same.
I tried the another Psu with the Asus and what do you know, horrible fluctuation.

seems to not do this at stock speeds though.... i guess it can't handle the load. I have an RMA to send out tomorrow going back to newegg for a refund. I'm getting a Gigabtye 880 microatx instead. I have no doubts that it will put up and be fine, just like my 785 gigabyte microatx.

Oh well, just letting you know about asus' VRM and Mosfets.
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