[ale] OT - hardware problem

Joe Knapka jknapka at kneuro.net
Mon Oct 11 18:49:51 EDT 2010


I have a couple old mobos around, from which I think I can harvest
enough good caps to fix up the broken one. This is gonna be fun!

Out of curiosity, how close do I need to be on the cap values?  There
are 5  3300uF ones on the broken board, and I found *four* good 3300uF
ones on an old Celeron mobo.  The next closest one I can find to
harvest is 2000uF. Y'all think that would work OK?  Maybe I can leave
the best of the five on the broken board in and replace the others, at
least as an initial test.

Thanks,

-- JK


On Mon, Oct 11, 2010 at 3:01 PM, Charles Shapiro
<hooterpincher at gmail.com> wrote:
> Ouch.  Had that ( http://en.wikipedia.org/wiki/Capacitor_plague )
> happen to one of my machines in 2004 or so.   I chucked the MB and
> bought a new one.
>
> -- CHS
>
> On Mon, Oct 11, 2010 at 4:48 PM, Joe Knapka <jknapka at kneuro.net> wrote:
>> I'm pretty sure it's not the fan, because when I did get the machine
>> to boot into the BIOS, the BIOS status screen reported fan speeds in
>> the 3000-4000 RPM range.
>>
>> I'll definitely look into the capacitor problem, though.  My soldering
>> skills are only fair, but this might be a good opportunity for a
>> Learning Experience :-)  I don't know exactly when the board was
>> manufactured, but it's a BioStar 6100-M9 Socket 939.
>>
>> Woah.  It's capacitors.  Two of the big 3300uF ones right by the CPU
>> socket are cracked like eggs.  Gotta find that soldering iron and the
>> desolder .
>>
>> -- JK
>>
>> On Mon, Oct 11, 2010 at 11:36 AM, Calvin Harrigan
>> <charriglists at bellsouth.net> wrote:
>>> Could it be the fan?  It might be spinning, but not sending any feedback
>>> to the MB and the MB thinks the fan is kaput.  This feature is usually
>>> only available on higher end boards though.  Most usually depend on
>>> temperature.  Just an idea.  What year was the board manufactured?
>>> Could you be suffering from bad capacitors?  Most if not all
>>> motherboards have a low voltage high current powersupply for the
>>> CPU,Memory on board, the capacitors there could be at fault.  Look for
>>> capacitors whose tops seem puffy or have stains, leaks, etc.  Most are
>>> relatively easy to replace if you have any experience with a soldering iron.
>>>
>>>
>>> On 10/11/2010 1:13 PM, Joe Knapka wrote:
>>>> I've already replaced the PS with a new-in-box one, with no change in
>>>> behavior.  So I don't think that's it.
>>>>
>>>> It's a socket 939 mobo; those seem to be hard to get these days. Looks
>>>> like at least mobo and CPU, and probably RAM, will need to be
>>>> replaced.
>>>>
>>>> Bleh.
>>>>
>>>> -- JK
>>>>
>>>> On Mon, Oct 11, 2010 at 9:25 AM, Scott Castaline<skotchman at gmail.com>  wrote:
>>>>>   On 10/11/2010 10:43 AM, Joe Knapka wrote:
>>>>>> On Mon, Oct 11, 2010 at 7:38 AM, Jim Kinney<jim.kinney at gmail.com>    wrote:
>>>>>>> true. easy test for that is to boot to the bios and leave it alone. There's
>>>>>>> no throttling in the bios for cpu speed AND you can run the temp page and
>>>>>>> watch for issues there.
>>>>>>
>>>>>> I was going to try this, but this morning the machine won't turn on at
>>>>>> all.  That is, press power button, fans spin up for about 1 second,
>>>>>> then immediately everything turns off.  Pulled the power switch off
>>>>>> the mobo and used a screwdriver between the pins to power up, and got
>>>>>> the same behavior.  Pulled the RAM, same behavior.  Wish I had an
>>>>>> alternate CPU to test.  Anyway I guess swapping out the mobo is the
>>>>>> next move.
>>>>>>
>>>>>> Thanks all,
>>>>>>
>>>>>> -- JK
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>>>>> If memory serves me correctly, you need a resistive load across the
>>>>> voltage outputs, otherwise the PSU will behave like that. They do make
>>>>> test plugs or at least used to for PSUs that provide the load needed to
>>>>> turn on. If it does the same thing with the plug then it's the PSU. Also
>>>>> I think that HDDs do provide enough load to trigger the PSU to stay on.
>>>>> Did you have any hdds, optical drives still plugged in? It's possible
>>>>> that one of them is dragging down the PSU.
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>>>>>
>>>>
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