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damn
Premium
join:2002-10-23
nyc

Cleaning circuit board from electrolyte (from capacitors).

Click for full size
This is ECU module from my car. The old caps were leaking and I replaced them. Now the fun part is that electrolyte got on the circuit board and I'd like to clean it up. I heard that baking soda and distilled water on toothbrush will do the trick, but I need to confirm because this module costs 250-300 bucks.
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shdesigns
Powered By Infinite Improbabilty Drive
Premium
join:2000-12-01
Stone Mountain, GA

Water is not the best. Distilled may be ok.

I use 91% rubbing alcohol or denatured alcohol on new boards to get rid of flux residue. You want something that will not leave any residue.


public

join:2002-01-19
Santa Clara, CA

said by shdesigns:

Water is not the best. Distilled may be ok.

I use 91% rubbing alcohol or denatured alcohol on new boards to get rid of flux residue. You want something that will not leave any residue.
Alcohol especially IPA is one of the worst flux cleaning agents.
Water is ok if the residue is soluble. Use distilled for the final rinse.
The board also needs a conformal coating before placing in service.


SparkChaser
Premium
join:2000-06-06
Downingtown, PA
kudos:3
Reviews:
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reply to damn

Where are the caps that failed, off to the left? Just wondering what they were.

I haven't had any trouble with alcohol but public is right it can attack some plastics. You can buy a can of this from RS »www.radioshack.com/product/index···e=family
Just don't mistake it for the one with the lubricant.

After the cleaner, cleaning everything with distilled water and "clean" tooth brush should do the trick. If you have compressed air blow out the water. Let it dry.

BTW - judging from the picture, the board was not cleaned all that well when made.
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