Arre these whiskers?

That looks more like flux residue. Today's water-based flux often leaves residues like that.

Jeroen Belleman

On a sunny day (Fri, 11 Oct 2019 11:10:48 +0200) it happened Jeroen Belleman wrote in :

OK, thanks, looks like I have to take the whole thing apart then to find the fault.

Might still be worth cleaning it off though. Degraded flux can sometimes end up being slightly hygroscopic and therefore leak current pin to pin.

Jeroen Belleman wrote in news:qnpguo$l8n$1 @gioia.aioe.org:

Seems so.

Yes, looks VOC rich too. Incomplete cleaning followed possibly by some other solvent that also didn't. There can be conduction/leakage paths.

John S wrote in news:qnpsrb$mec$ snipped-for-privacy@dont-email.me:

NOT acetone! That melts many polymers and the silk screen inks and softens the solder mask layer as well.

Simply use a brominated solvent.

Simply?

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

John Robertson wrote in news: snipped-for-privacy@giganews.com:

I didn't say halogenated, dipshit. I said BROMINATED.

It is what Boeing uses. And no, my idea of Boeing and their quality level did not take a hit over two pilot (training) error centered plane crashes.

Looks like white residue from flux, and it was probably manufactured that way. If the chip is digital or normal analog, it won't matter. If you don't like it, use flux remover or soapy water and and brush hard.

I like Soft Scrub for cleaning electronics, especially copperclad.

That is one really mis-registered drill!

This is whiskers growing out of tin plate:

fredag den 11. oktober 2019 kl. 17.32.10 UTC+2 skrev DecadentLinux...@decad ence.org:

"Halogenated solvent is an organic solvent, molecules of which contain halo genic atoms: chlorine (Cl), fluorine (F) , bromine (Br) or iodine (I)."

Lasse Langwadt Christensen wrote in news: snipped-for-privacy@googlegroups.com:

The one I cited is one of the cleanest, safest around.

You think acetone is inert?

Halogenated solvent is an organic solvent, molecules of which contain halogenic atoms: chlorine (Cl), fluorine (F) , bromine (Br) or iodine (I).

Good information from the website at your link.

Thank you, 73,

Bromine *is* a halogen you half wit. N bromopropane is not as benign or inert as you seem to think. Quite a few exposure accidents.

When the nearly inert CFC degreasers got banned by the Montreal protocol we had all sorts of fun trying to find an adequate degreaser for hard vacuum electronics that worked well enough without being too toxic.

CO2 snow is about the best around--it melts on impact, and liquid CO2 is a wonderful organic solvent.

Cheers

Phil Hobbs

G_0186.JPG

he silk screen

D.

nd their

afaik solid CO2 doesn't turn liquid, it turns directly to gas

It liquefies transiently on impact, which is why it works. Of course it'll probably rip the silk screen off the board, but you can't have everything. ;)

Cheers

Phil Hobbs

I used to play with nitrobenzene when I was a kid, Kerr cells mostly. Just lately I found out that skin exposure can be lethal. Learned that from a Nero Wolfe mystery.

Chemical supply houses used to sell most anything to anybody, even kids.

I use acetone to clean off flux when I hand solder things on PC boards. Works great with a q-tip. I've never seen it affect the silkscreen or solder mask.

Phil Hobbs wrote in news:qnqo8b$o43$ snipped-for-privacy@dont-email.me:

Learn to read threads, asshole. I already got that (proper) corrective response and it was a damn sight more diplomatic than the s*it you post when you act that way.

You are better when you post intelligent material.

The above is not an example of that.