On 7/14/2017 8:45 PM, ABLE1 wrote:
Hello all,

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??

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

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.

Thanks for any hints or tip on this matter.

Have a good day.

Les



Ok, Update and another question.

I removed all the leaking caps plus the others of the same type
and size that had not shown signs of leakage just to be thorough.

I then cleaned the board with some mild detergent, rinsed off
and placed in my pre-heated oven at 220F and then turned off.

Let set in the oven for about 2 hours while it cooled. Pulled
the board out and it looks good.

So far so good. It is now time to install the new caps.

And then it hit me.

This is a double sided board. I am concerned that the component
side of the board that is under the capacitor will not be soldered
properly to the leads.

Is there some trick that needs to be applied somehow to get this
soldered properly??

Again thanks for any thoughts or suggestions.

Les