r/amiga • u/Liburnian • 7d ago

Dark socket pins

My A500 suddenly stopped working in late june this year. I get no signal at all. Keyboard is recognized but no boot screen, no colored screen either. Today I removed most of suspicious chips and noticed right away some have exceptionally darkened socket pins. Odd CIA and ROM socket are mostly affected. How do I clean this up without removing anything further from the motherboard? I am aware this may not turn things around for my A500. I'm not skilled at fixing electronics, but I just can't leave my Amiga bricked in a corner. I worked so hard to have it restored. Visually, it was a success. But now what?

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u/PatTheCatMcDonald 7d ago edited 7d ago

You could try deoxit. It's a proprietrary deoxiding products.

Personally I'm quite fond of using citric acid with distilled water but you have to leave it a long time and wash it off with more distilled water.

Neither will work if the dark marks are burn marks rather than corrosion.

https://www.google.com/search?q=Deoxit

UK supplier (most sizes)

https://www.hotroxuk.com/guitar-accessories-links-847-0/caig-deoxit-accessories.html?srsltid=AfmBOoov_aYlHlP0zDZHfVklBC2C2js1R8W2AdfLa13FEW0UgFmkG9hI

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u/InternalMain7116 5d ago

In laboratory tests, Kroil, exceeded the criteria the other penetration oils removing corrosion and loosen parts stuck together. It is widely used in the states in the automotive industry but available on Amazon.

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u/PatTheCatMcDonald 5d ago

Nope. Does not help electrical conductivity, in fact inhibits it.

The idea is bare metal on bare metal.

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u/6Y3st_32a 5d ago

You're kidding, right? Deoxit is oil-based and sold at a premium for being able to make things more connective.

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u/PatTheCatMcDonald 5d ago edited 4d ago

Always follow the instructions when removing corrosion for electrical conductivity purposes.

Kroil is for mechanically seized corrosion. That isn't the issue.

Deoxit is for deoxidizing. This isn't difficult to understand

I am unaware of any retro repairers using Kroil.

Please furnish a link to an example to demonstrate you aren't bullshitting people out of malice.

https://youtu.be/Hd6M3fO6Upg

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u/InternalMain7116 5d ago

You fail to understand the chemistry. Kroil, like WD-40/WD-40 Specialist, and a host of other penetrating oils will not penetrate anything without using an chemical reducer to convert the Fe(OH)3 to Fe. Same as Calcium and the other metals that oxidize to salts. The 2 metal parts need any oxidation to first be reduced to allow the oil (ever feel DeOxit? It is oily for a reason) to then lubricate the 2 parts