[Shop-talk] blue screen problems... need the gurus

[Jeff Scarbrough]

I've heard that it can damage the bearings...though I've never really
managed to do that, that I know of...



On Thu, Mar 31, 2016 at 11:43 AM, Tony Vaccaro <tvacc at lotusowners.com> wrote:
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> From: Shop-talk [mailto:shop-talk-bounces at autox.team.net] On Behalf Of John
> T. Blair
> Sent: Thursday, March 31, 2016 6:55 AM
> To: shop-talk <shop-talk at autox.team.net>
> While I see the logic in this, I have never had that thought. I have been
> working on computers for 35 years. Blown out hundreds of computers.
> Sometimes I block the fan, sometimes I don’t, but if I do it is only to not
> damage the fan and I just usually do it on Laptops as the fans are much more
> fragile.
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> I have never had a computer fail to restart (which damaging the CPU would
> do) after blowing it out. My blower is super powerful and I used to use
> compressed air. I would spin those suckers right up.
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> I would suspect there is a crowbar circuit in the CPU logic circuitry to
> prevent this from happening.
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> I am not saying that this is not possible, just in all my years I have never
> seen it happen and I have seen most other computer related stuff happen. Not
> much I have missed.
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> Tony V
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> Subject: Re: [Shop-talk] blue screen problems... need the gurus
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> At 10:01 PM 3/30/2016, Brian Kemp wrote:
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>>John - You may have a dust problem.  Remove the power cord and open the
>>computer.  Take a shop vac that blows or some compressed air and clean
>> things
>>out.  It is best to do this outside.
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> John,
>
> If you blow down the inside of the computer with compressed air, put a
> finger on
> the fan on the CPU.  You don't want it to turn.  The compressed air can spin
> up
> the fan a lot faster than it is supposed to run.  So a DC motor being turned
> externally becomes a generator, and spinning faster then design speed causes
> it
> to output a higher voltage than it runs on.  This overvoltage is being
> applied back
> to the mother board and can back feed the CPU and cause it to fail.
>
> John
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