Digest for sci.electronics.repair@googlegroups.com - 12 updates in 4 topics

Foxs Mercantile <jdangus@att.net>: Oct 20 03:47PM -0500

> WD-40 (Running for cover).
 
 
Actually, that's one of the few things it actually does well.
The WD in WD-40 stands for Water Displacement.
 
 
--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com
Jeff Liebermann <jeffl@cruzio.com>: Oct 21 09:47AM -0700

>function, but for how long?.
>Other than getting inside and probably breaking a foil ribbon or
>something, any advice , other than keeping it out of damp in the futrere?
 
I fix computahs to support my decadent and lavish lifestyle. I get an
amazing number of laptops and cell phones that need drying out. Cell
phones seem to prefer ocean swimming and toilet water while laptops
prefer to drink beverages (wine, beer, milk, soda, coffee, tea, etc).
In all cases, I can't do much if the laptop or cell phone has been
left to dry for a few days. Whatever solid residue was in the fluids
is now caked all over the switches, connectors, contacts, PCB, etc. If
the fluid is corrosive (salt water), the damage has already been done
by rotting the copper traces. Even tap water leaves a residue of
white lime.
 
My number one tool is the screwdriver. The water will NOT exit a
sealed enclosure. If your camera is tightly sealed, you can cook it
forever, and the water will just re-condense inside when it cools back
down. The idea is got the moisture laden air out of the camera. So,
take it apart sufficiently to give the guts some breathing room.
 
Number two tool is my air compressor and air hose. Like all good
tools, it is possible to do more damage than good with compressed air.
For example, you could blow rusty water from the bottom of the
compressor air tank into the camera. You could also use too much
pressure causing something to bend, break, tear, or fly away. So, you
need drain the rusty water out of the tank, use a filter/dryer, an use
low pressure air. If desperate, an automobile fuel filter will work
for low pressure air. My guess is no more than 20 psi air pressure.
 
This part doesn't apply for the camera but should be mentioned. If
you're trying to clean up a beverage or salt water spill, that has
partly dried, you will want to add some solvent to help liquefy the
residue. I use a 50/50 mix of 70% isopropyl alcohol and distilled
water. If I need something stronger, 409 cleaner. Basically,
anything that doesn't leave any residue. Test your favorite
concoction for residues on a piece of clear glass before using. To
keep from making a large mess with a spray bottle, I make a small mess
using an acid brush.
 
The rest is simple. I use the air hose to blow away the accumulated
and added liquids. I use a narrow nozzle tip to help get under
electronic components.
<https://www.amazon.com/Air-Blow-Gun-Interchangeable-Nozzles/dp/B0017JSD34>
(But two because the nozzle breaks when dropped). Even when you think
you have all the water blown out of the device, try blowing from a
different angle, or shake the device to uncover hidden droplets. Be
sure to blow into enclosed areas, like switches. Cover any optics
that might be sprayed or you'll have water marks on the lenses.
 
After the blow dry, bake in a warm (not hot) oven for as long as you
think is safe. You want to accelerate the water evaporation, not melt
all the glue and plastic parts. Please note that the device needs to
be open to the air for the water to evaporate properly. Only when
you're sure it's dry, put it back together, apply power and see if it
works.
 
There are some other things that need to be done when dealing with
keyboards and LCD displays, but I don't think that's needed here. Good
luck.
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
harry newton <harry@is.invalid>: Oct 20 11:30PM

Does anyone know what *version* of wpa_supplicant contains the KRACK fix?
<http://wetakepic.com/images/2017/10/20/wpa_supplicant.jpg>
 
LINUX:
x@x:~$ which wpa_supplicant
/sbin/wpa_supplicant
x@x:~$ !$ -version
wpa_supplicant -version
wpa_supplicant v2.4
Copyright (c) 2003-2015, Jouni Malinen <j@w1.fi> and contributors
 
WINDOWS:
c:\> wpa_supplicant
'wpa_supplicant' is not recognized as an internal or external command,
operable program or batch file.
William Unruh <unruh@invalid.ca>: Oct 21 12:57AM

> Does anyone know what *version* of wpa_supplicant contains the KRACK fix?
> <http://wetakepic.com/images/2017/10/20/wpa_supplicant.jpg>
 
None. It is at present a bunch of patches. However, most distributions
have pushed out a fixed version by now. On Mangeia it is 2.6-1.1 on
Mageia 6, 2.6-1 on Mageia 5 and 2.6-3 on Mageai Cauldron.
You do not tell us which Linux you are refering to.
Note that 2.4 probably does not have the fix.
But it all depends on your distro.
 
> c:\> wpa_supplicant
> 'wpa_supplicant' is not recognized as an internal or external command,
> operable program or batch file.
 
Windows does not use wpa_supplicant. That is an open source wpa program.
It is used by Android, but again it is probably not a "stock" version,
but may well have been altered by the phone manufacturer to include
special features of the wireless chipset they use.
harry newton <harry@is.invalid>: Oct 21 03:47AM

He who is William Unruh said on Sat, 21 Oct 2017 00:57:13 -0000 (UTC):

> You do not tell us which Linux you are refering to.
> Note that 2.4 probably does not have the fix.
> But it all depends on your distro.
 
Thanks William for that detailed technical answer.
 
I apologize for not providing complete information.
<http://wetakepic.com/images/2017/10/21/ubuntu_version.jpg>
 
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
$ cat /etc/*release | grep VERSION
VERSION="16.04.2 LTS (Xenial Xerus)"
 
> It is used by Android, but again it is probably not a "stock" version,
> but may well have been altered by the phone manufacturer to include
> special features of the wireless chipset they use.
 
Thanks William. It's so refreshing to deal with actual technical answers!
 
Here is what my Android 4.3 phone just reported:
<http://wetakepic.com/images/2017/10/21/android_wpa.jpg>
 
$ wpa_supplication -version
wpa_supplicant v2.1-d15el-4.3 2015-08-13/21:13:54
Copyright (c) 2003-2014, Jouni Malinen <j@wl.fi> and contributors
William Unruh <unruh@invalid.ca>: Oct 21 04:35AM


> Thanks William for that detailed technical answer.
 
> I apologize for not providing complete information.
><http://wetakepic.com/images/2017/10/21/ubuntu_version.jpg>
 
Debian (on which Ubuntu is based) came out with those patches on Monday
I think. Ie, the version on the Ubuntu sight by Wed was probably the
patched version. If yours was installed befor Wed it almost certainly is
not patched. Definitely if it was before Mon the 16th it is not patched.
 
 
> Thanks William. It's so refreshing to deal with actual technical answers!
 
> Here is what my Android 4.3 phone just reported:
><http://wetakepic.com/images/2017/10/21/android_wpa.jpg>
 
It really says nothing. They could have patched that version of 2.1 Or
probably not. Although there is a claim in the original that it was
wpa_supplicant 2.4 and later that were problematic. And that it is
android 6 and later that is problematic. I have no idea whether that is
because those are the only ones tested, or because earlier ones are OK.
 
 
Richard Kettlewell <invalid@invalid.invalid>: Oct 21 11:59AM +0100

> Codename: xenial
> $ cat /etc/*release | grep VERSION
> VERSION="16.04.2 LTS (Xenial Xerus)"
 
You need 2.4-0ubuntu6.2.
http://changelogs.ubuntu.com/changelogs/pool/main/w/wpa/wpa_2.4-0ubuntu6.2/changelog
 
Use dpkg -l to check the package version.
 
--
https://www.greenend.org.uk/rjk/
"Jonathan N. Little" <lws4art@gmail.com>: Oct 21 10:16AM -0400

Richard Kettlewell wrote:
> dpkg -l
 
Or apt-cache:
 
~$ apt-cache policy wpasupplicant
wpasupplicant:
Installed: 2.4-0ubuntu6.2
Candidate: 2.4-0ubuntu6.2
Version table:
*** 2.4-0ubuntu6.2 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main
amd64 Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main
amd64 Packages
100 /var/lib/dpkg/status
2.4-0ubuntu6 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
 
Also latest version of 16.04 is:
 
$ lsb_release -d
Description: Ubuntu 16.04.3 LTS
 
sudo apt-get update && sudo apt-get dist-upgrade
 
--
Take care,
 
Jonathan
-------------------
LITTLE WORKS STUDIO
http://www.LittleWorksStudio.com
"~misfit~" <shaun.at.pukekohe@gmail.com>: Oct 21 11:34PM +1300

Once upon a time on usenet Peabody wrote:
 
>> Eventually I'll end up with a smart phone. Resistance
>> is futile...
 
> I thought I was the only one.
 
I'm still using a Nokia flip (and trying to treat it very carefully...).
 
I really don't want to have to use a smartphone (well I actually have a
couple but don't use them as phones.)
--
Shaun.
 
"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)
John-Del <ohger1s@gmail.com>: Oct 20 10:19AM -0700

On Friday, October 20, 2017 at 12:23:17 PM UTC-4, rickman wrote:
> like his questions (I'm not suggesting they don't show the problems you
> mention) why bother to respond?
 
> --
 
Peter may not suffer fools gladly, but he suffers them with far more patience than most. I've "known" Peter for almost 20 years on usenet and know for a fact he's far more the gentleman than the vast majority of users are.
 
John
Wolcott, CT
"pfjw@aol.com" <pfjw@aol.com>: Oct 20 10:48AM -0700

Once upon a time, we had a 10-year old, very stubborn Golden Retriever. He was getting arthritic, cranky, and generally set in his ways. Then, our daughter gave us a golden retriever puppy.
 
It gave our old guy a new lease on life. He dropped dead just under five years later while tugging on a stick with the then-five year old. Proving even old dogs can learn something.
 
Might apply to Oldschool - although liberal applications of various clue-sticks may be required - we have found in his case that treats do not work. Does with dogs.
 
Peter Wieck
Melrose Park, PA
rickman <gnuarm@gmail.com>: Oct 20 01:48PM -0400

John-Del wrote on 10/20/2017 1:19 PM:
>> mention) why bother to respond?
 
>> --
 
> Peter may not suffer fools gladly, but he suffers them with far more patience than most. I've "known" Peter for almost 20 years on usenet and know for a fact he's far more the gentleman than the vast majority of users are.
 
His diplomatic side is not showing here, but I guess we all suffer that
problem from time to time. Who me??? ;)
 
--
 
Rick C
 
Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
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