View unanswered posts | View active topics It is currently Fri Aug 18, 2017 11:13 pm



Reply to topic  [ 5 posts ] 
Clean Off Your Flux!! 
Author Message
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14706
Location: Home sweet home!
I got "fluxed" by this today, among other things. When assembling hardware, even if temporarily, clean off the flux!

I put my FredStim together a year ago, it stopped working about a month ago. I needed it today, and fixed it. Fix: Cleaning with alcohol, toothbrush, ultrasonic cleaner.

I know Sean got "fluxed" by flux too, recently. Spudmn got "fluxed" by flux a while back when it ate his FT232R chip. Many people get "fluxed" by flux. Clean off your flux, before it "fluxs" you too.

Flux is conductive, especially in a humid environment. It's fairly dry when first assembled due to the heat, but after time, it changes and starts conducting and ruining your signals or hardware. It can even dissolve your hardware in extreme cases, permanently damaging it.

This warning brought to you by a fellow victim, "fluxed" by flux. Feel free to share stories of your experiences getting "fluxed" by flux.

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Wed Nov 14, 2012 3:18 pm
Profile WWW
LQFP112 - Up with the play
User avatar

Joined: Sat Sep 29, 2012 9:16 pm
Posts: 148
Location: Rotterdam, the Netherlands
I always have a bottle of PCC nearby for immediate cleanup after soldering (printed circuit cleaner).

_________________
FABRICA MI DIEM, PVNC!


Wed Nov 14, 2012 7:48 pm
Profile
QFP80 - Contributor

Joined: Thu Mar 19, 2009 3:05 am
Posts: 99
i had this problem a while back.

A megasquirt not built by me, but tuned in a rally car.
Everything went really strange, pulled it out tested things that were just odd. I figured it out after a meeter prob slipped off the terminal and was still frikken reading. looked everywhere in the service park, many paint brushes, many tooth brushes.. but no alcohol.

Finally desperate i said well, it is "Fluxed" already, cant make it worst. Out with a can of non chlorinated brake cleaner. Blow off with an air gun. 2 swings and it was running again. we actually one the rally.. lol

after that i always de flux everything even it is a temp fix..


Thu Nov 15, 2012 2:49 pm
Profile
QFP80 - Contributor
User avatar

Joined: Sun Aug 21, 2011 6:26 pm
Posts: 77
Location: Spain
oh, that happened to me a month ago. I was having a lot of misfirings without any cause. Until I revised the ECU and saw a zone with white spots between transistors legs. (I had used flux near to one months before that fail..), cleaned it and misfires gone :lol2:

_________________
Sierra XR4i 2.0T


Sat Nov 24, 2012 4:59 pm
Profile
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14706
Location: Home sweet home!
I put the SMD parts on an 0.4-alpha Jaguar for piimae tonight and post testing was soaking it in alcohol ready to scrub it and the flux became very visible, so here it is in full resolution (excessive). The brown bits are flux, as are the white spots. There is also some lense flare, that's not flux...:

Image

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Fri May 24, 2013 11:54 pm
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 5 posts ] 

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF. ColorizeIt.