And even yet another weird corrosion story

[Toby Paddock]

My first home pc was put together from used parts. It would lock up 
about 5 minutes after power up. So I grabbed can of freeze spray 
and started freezing chips on the motherboard. Nothing. Sprayed 
the whole board. Locked up. Again, again. Same same. 

It would lock up when I sprayed the board where there were no parts, 
only traces. Under a microscope I found (you guessed it) 
MINIATURE GREEN CORROSION LIKE ON A CAR BATTERY. 
There was also a scratch across the traces. 

My theory was that someone used pliers to remove the nearby 
hexnut and gouged the trace almost through. 
Voltage drop caused corrosion. The "corrosion stuff" became the 
only (not very stable) conductor.

Cleaned it, soldered a jumper across it, and eventually scrapped 
it because it was still a piece of junk.

 - -- -  Toby Paddock