[sdiy] black flaky chip legs: what does this indicate?

[KA4HJH]

> On Nov 1, 2020, at 5:26 PM, Kenny Balys <kenny at beatkamp.com> wrote:
> 
> Yes!!!!!
> 
> They were both TI and the device was manufactured in 1979.
> 
> Both IC's were socketed. I had to pull disconnected legs out of the
> sockets after removing the chips. They shed their legs.


I saw this happen once with a Bally pinball machine from the late '70s, the first generation electronic ones. The logic board was damaged by a leaking NiCd battery (the most common mode of failure) and when I tried to pull the ROMs out of the sockets the legs just snapped off. I don't recall the manufacturer.

I don't know if the battery had anything to do with it. It's mounted at the bottom of the board and the firmware is up at the top. I've seen these boards with much worse corrosion and the ROMs/EPROMs were OK.


Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com/

“The book said something astonishing, a very big thought.
It said that the stars were suns, only very far away.
The Sun was a star, but close up.”—Carl Sagan, Cosmos, 1980


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