On 7/14/2017 11:31 PM, Phil Allison wrote:
ABLE1 wrote:

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I have a sound amplifier board with what looks like some 25v 220mfd
radial capacitors that appear to have leaked some of the electrolyte on
to the board. The board is easily 20+ years old.

One of the IC chips that is in the area appears to have some corrosion
on the pins.

If someone would be so kind to answer my questions they are as follows:

Is the electrolyte some kind of acid base??


** It's usually ethylene glycol plus boric acid and loves to attack copper.


Will washing the board with contact cleaner properly clean
and or neutralize the effects??


** Contact cleaner is undefined, can be damn near anything.

I use a "Circuit Boaord Cleaner" that has a combination of hydrocarbon solvents and dries quickly.


I plan on replacing the bad capacitors but want to be sure I am
not missing something. I don't want to replace the chip unless
it is damaged in some way.


** Clean it up best you can and watch out if electrolyte has gone underneath.

I have found a small fibreglass brush useful.

http://au.element14.com/duratool/d02...4mm/dp/2102028

Really bad cases may need immersion in hot, detergent water to come good.



.... Phil


Tom, NT, Phil, Thanks for all the input.

I get the idea on cleaning. BTW as for "Contact Cleaner" I was
referring to this one.

https://www.zoro.com/crc-electronic-...00/i/G8578595/
Or similar, but may not be the most desired.

Phil, as for the term "Circuit Board Cleaner" is there a specific brand
that you use??

Presently searching for replacement caps. Once I acquire them I will
dive into this project.

Another question: Concerning the chip that has been effected. Can or
could the electrolyte leach into the chips at the pins and cause
problems with the chip in some way?? Or is the chip considered
hermetically sealed is some fashion??

Thanks again!! Do appreciate the insight.

Les