Mac Classic II logic board problems.

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Joined: Jun 8 2007
Posts: 213

I posted a topic about my Macintosh Classic II going berserk on me. Someone told me to wash the motherboard and let it dry for 3 days. What will that do???

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Joined: Jul 13 2007
Posts: 179
you can try it

you can try it to look for another logicboard from ebay.it is easy and simple thing.

coius's picture
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Joined: Aug 25 2004
Posts: 1975
removes stuff

like dirty, and any corrosion that might have occurred due to component leakage.

Sometimes, the corrosion will short out pins and components causing a drop in current, or current not flowing the way it should. that causes problems that mean the computer either doesn't work reliably, or doesn't work at all.

I recommend distilled water. Less contaminants like lead and zinc, etc... that is found in tap water.

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Hawaii Cruiser's picture
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Joined: Jan 20 2005
Posts: 1434
The question is, if the washi

The question is, if the washing works, how long before leakage runs the motherboard foul again? Any permanent fixes besides replacing components?

FunnymanSE30's picture
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Joined: Aug 22 2005
Posts: 403
1 of mine lasted a few weeks,

1 of mine lasted a few weeks, the other 2 have been running well for at least a year. Maybe 2

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Hawaii Cruiser's picture
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Joined: Jan 20 2005
Posts: 1434
I think the aerosol spray tha

I think the aerosol spray that Jon had suggested in my Kiwi post on the same problem was some type of sealant for the capacitors. Jon, where are you, buddy?

Jon's picture
Jon
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Joined: Dec 20 2003
Posts: 2804
Well, I'm here now. For the t

Well, I'm here now. For the time being I don't recall exactly what I posted, but I'd guess it was something like electrical parts cleaner or some such. Sometime I run into a issue and I can't remember how I solved it in the past. My memory fails me in many ways, and surprises me in others...

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Joined: Dec 20 2003
Posts: 211
Re: The question is, if the washi

Hawaii Cruiser wrote:

The question is, if the washing works, how long before leakage runs the motherboard foul again? Any permanent fixes besides replacing components?

Isolated cleaning -- identifying a failed component and cleaning around it with distilled water and alcohol -- will work for a while, until the component (99% of time capacitor) fails completely or another one goes. Radical cleaning of the entire board keeps it running longer, because you are delaying more than one capacitor failure. Ultimately, you'll need to replace all of the capacitors when they reach complete end of life. How long? It depends on climate, Mac usage etc. My guess is that there will be a modest business for refurb Mac SE/30, Quadra, IIci, IIfx logic boards in the future.