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

[MTG]

Interesting. I repaired some TTL recently with new from Mouser TI parts 
with not-shiny legs. They soldered fine though so I didn't give it much 
thought until I started reading this thread.

GB

On 11/1/2020 7:37 PM, Doug Terrebonne via Synth-diy wrote:
> Yep see those blackened socketed TIs all the time especially in OB-X/Xas.
>
> Doug
> synthparts.com
>
> On Sunday, November 1, 2020, 3:03:36 PM PST, KA4HJH <ka4hjh at gmail.com> 
> wrote:
>
>
>
>> On Nov 1, 2020, at 5:26 PM, Kenny Balys <kenny at beatkamp.com 
>> <mailto: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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