Water spilled in PC - your thoughts?
in [Home Built PC]
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From: Bug Dout on 13 Jan 2010 11:12 Kyle <ThisIsPrivate(a)NoAddress.com> writes: > I'm sorry but water damages completely and irreparably any kind of > electronic device. Utter nonsense. > Even if you are able to start the PC after drying etc etc, sooner or > later you'll see crashes or other effects of water on the long term. She'll see crashes because she's running Windows, not because of tap water. -- I have examined all of the known superstitions of the world and I do not find in our superstitions of Christianity one redeeming feature. ~ Thomas Jefferson
From: Paul on 13 Jan 2010 15:41 Kyle wrote: > On Sat, 9 Jan 2010 20:10:32 -0800 (PST), philnblanc(a)comcast.net wrote: > <<snip>> > > I'm sorry but water damages completely and irreparably any kind of > electronic device. > I hope you're aware they wash PCBs at the factory, just after the soldering is finished. Here is an advert for a defluxing system, which is the step after soldering is complete. As long as the product has no post-drying residue and the PCB is dry before test, it works just as it did before. http://www.emasiamag.com/article-2840-automaticpostreflowdefluxingsystem-Asia.html You can see in the picture here, these particular ones operate like dish washers, with the PCBs sitting in a rack. https://www.manncorp.com/pcb-cleaners/index.php?auto=done This one is inline and this machine sits in the conveyor belt line and washes PCBs as they go by. http://www.electroiq.com/index/display/article-display.articles.smt.surface-mount_technology.cleaning.cleaning-equipment.2009.02.aqueous-acquires-aats-microjet-defluxing-systems.QP129867.dcmp=rss.page=1.html This article mentions some of the changes in washing practices over the years. http://www.smtnet.com/library/files/upload/Defluxing_Deja_vu.pdf At one time, they used liquids like trike to clean boards, because the solder flux wasn't water soluble. The switch to alcohol and water solvent systems, means no nasty stuff to give the staff cancer. They make the flux water soluble, so that the cleanup is easier. http://en.wikipedia.org/wiki/Trichloroethylene Paul
From: Rick on 13 Jan 2010 16:22 Paul wrote: > Kyle wrote: >> On Sat, 9 Jan 2010 20:10:32 -0800 (PST), philnblanc(a)comcast.net wrote: >> > > <<snip>> > >> >> I'm sorry but water damages completely and irreparably any kind of >> electronic device. >> > > I hope you're aware they wash PCBs at the factory, just after the > soldering is finished. Here is an advert for a defluxing system, > which is the step after soldering is complete. As long as the > product has no post-drying residue and the PCB is dry before > test, it works just as it did before. > > http://www.emasiamag.com/article-2840-automaticpostreflowdefluxingsystem-Asia.html > > > You can see in the picture here, these particular ones operate like > dish washers, with the PCBs sitting in a rack. > > https://www.manncorp.com/pcb-cleaners/index.php?auto=done > > This one is inline and this machine sits in the conveyor belt > line and washes PCBs as they go by. > > http://www.electroiq.com/index/display/article-display.articles.smt.surface-mount_technology.cleaning.cleaning-equipment.2009.02.aqueous-acquires-aats-microjet-defluxing-systems.QP129867.dcmp=rss.page=1.html > > > This article mentions some of the changes in washing practices > over the years. > > http://www.smtnet.com/library/files/upload/Defluxing_Deja_vu.pdf > > At one time, they used liquids like trike to clean boards, because > the solder flux wasn't water soluble. The switch to alcohol and > water solvent systems, means no nasty stuff to give the staff cancer. > They make the flux water soluble, so that the cleanup is easier. > > http://en.wikipedia.org/wiki/Trichloroethylene > > Paul All true Paul but, when you put power to the components then as you should well know problems may occur. -- Rick Fargo, ND N 46�53'251" W 096�48'279" Remember the USS Liberty http://www.ussliberty.org/
From: Paul on 13 Jan 2010 18:07 Rick wrote: > Paul wrote: >> Kyle wrote: >>> On Sat, 9 Jan 2010 20:10:32 -0800 (PST), philnblanc(a)comcast.net wrote: >>> >> >> <<snip>> >> >>> >>> I'm sorry but water damages completely and irreparably any kind of >>> electronic device. >>> >> >> I hope you're aware they wash PCBs at the factory, just after the >> soldering is finished. Here is an advert for a defluxing system, >> which is the step after soldering is complete. As long as the >> product has no post-drying residue and the PCB is dry before >> test, it works just as it did before. >> >> http://www.emasiamag.com/article-2840-automaticpostreflowdefluxingsystem-Asia.html >> >> >> You can see in the picture here, these particular ones operate like >> dish washers, with the PCBs sitting in a rack. >> >> https://www.manncorp.com/pcb-cleaners/index.php?auto=done >> >> This one is inline and this machine sits in the conveyor belt >> line and washes PCBs as they go by. >> >> http://www.electroiq.com/index/display/article-display.articles.smt.surface-mount_technology.cleaning.cleaning-equipment.2009.02.aqueous-acquires-aats-microjet-defluxing-systems.QP129867.dcmp=rss.page=1.html >> >> >> This article mentions some of the changes in washing practices >> over the years. >> >> http://www.smtnet.com/library/files/upload/Defluxing_Deja_vu.pdf >> >> At one time, they used liquids like trike to clean boards, because >> the solder flux wasn't water soluble. The switch to alcohol and >> water solvent systems, means no nasty stuff to give the staff cancer. >> They make the flux water soluble, so that the cleanup is easier. >> >> http://en.wikipedia.org/wiki/Trichloroethylene >> >> Paul > All true Paul but, when you put power to the components then as you > should well know problems may occur. > I'm correcting the statement that electronics are instantly destroyed when they come in contact with water. They're not. If a circuit under bias, comes in contact with a higher than normal voltage, it could be damaged. Say, for example, you drop your operating computer into a vat full of salty water. The 120V from the power feeding the computer, may then come in contact with circuits that are only capable of handling much lower voltages (5V/3.3V/1.8V etc). The reason the computer of "Toolpackinmama" wasn't destroyed, is because even though there was a sizzling sound (water contacting 120V), it didn't come in contact with anything sensitive. There wasn't sufficient water providing a continuous conducting path, to ruin anything. If a circuit is not under bias, then you can pour water on it all you want. (Like they do, when they're washing the PCBs during manufacturing.) If the water contains dissolved salts, acids or the like (Coke), then there could be consequences down the road. Washing with clean water and removing any residues, then thoroughly drying, should give you many more years of service. Paul
From: Toolpackinmama on 24 Jan 2010 06:23
On 1/13/2010 3:41 PM, Paul wrote: > Kyle wrote: >> On Sat, 9 Jan 2010 20:10:32 -0800 (PST), philnblanc(a)comcast.net wrote: >> > > <<snip>> > >> >> I'm sorry but water damages completely and irreparably any kind of >> electronic device. >> > > I hope you're aware they wash PCBs at the factory, just after the > soldering is finished. Here is an advert for a defluxing system, > which is the step after soldering is complete. As long as the > product has no post-drying residue and the PCB is dry before > test, it works just as it did before. > > http://www.emasiamag.com/article-2840-automaticpostreflowdefluxingsystem-Asia.html > > > You can see in the picture here, these particular ones operate like > dish washers, with the PCBs sitting in a rack. > > https://www.manncorp.com/pcb-cleaners/index.php?auto=done > > This one is inline and this machine sits in the conveyor belt > line and washes PCBs as they go by. > > http://www.electroiq.com/index/display/article-display.articles.smt.surface-mount_technology.cleaning.cleaning-equipment.2009.02.aqueous-acquires-aats-microjet-defluxing-systems.QP129867.dcmp=rss.page=1.html > > > This article mentions some of the changes in washing practices > over the years. > > http://www.smtnet.com/library/files/upload/Defluxing_Deja_vu.pdf > > At one time, they used liquids like trike to clean boards, because > the solder flux wasn't water soluble. The switch to alcohol and > water solvent systems, means no nasty stuff to give the staff cancer. > They make the flux water soluble, so that the cleanup is easier. > > http://en.wikipedia.org/wiki/Trichloroethylene Hey Paul, thanks for a really interesting post with lots o' links :) |