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From: Shop-talk [mailto:shop-talk-bounces@autox.team.net] On Behalf Of John
T. Blair
Sent: Thursday, March 31, 2016 6:55 AM
To: shop-talk <shop-talk@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.
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.
I would suspect there is a crowbar circuit in the CPU logic circuitry to
prevent this from happening.
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.
Tony V
Subject: Re: [Shop-talk] blue screen problems... need the gurus
At 10:01 PM 3/30/2016, Brian Kemp wrote:
>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.
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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o:p></span></p><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Shop-talk [mailto:shop-talk-bounces@autox.team.net] <b>On Behalf Of =
</b>John T. Blair<br><b>Sent:</b> Thursday, March 31, 2016 6:55 =
AM<br><b>To:</b> shop-talk <shop-talk@autox.team.net><br>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.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>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.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>I would =
suspect there is a crowbar circuit in the CPU logic circuitry to prevent =
this from happening. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>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.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Tony =
V<o:p></o:p></span></p><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </=
o:p></span></b></p><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Subject:</spa=
n></b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Re: [Shop-talk] blue screen problems... need the =
gurus<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>At 10:01 PM 3/30/2016, Brian Kemp =
wrote:<br><br>>John - You may have a dust problem. Remove the =
power cord and open the<br>>computer. Take a shop vac that =
blows or some compressed air and clean things <br>>out. It is =
best to do this outside.<br><br>John,<br><br>If you blow down the inside =
of the computer with compressed air, put a finger on<br>the fan on the =
CPU. You don't want it to turn. The compressed air can spin =
up<br>the fan a lot faster than it is supposed to run. So a DC =
motor being turned <br>externally becomes a generator, and spinning =
faster then design speed causes it<br>to output a higher voltage than it =
runs on. This overvoltage is being applied back<br>to the mother =
board and can back feed the CPU and cause it to =
fail.<br><br>John<br><br><o:p></o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><o:p> </o:p></p></div></body></html>
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