24 Jul
2019
24 Jul
'19
12:30 p.m.
Brent Hilpert wrote:
On 2019-Jul-24, at 10:31 AM, Jeffrey S. Worley via cctalk wrote:
Probably temporarily reattached a bond wire which "re-broke" after a few
thermal cycles.
Bill S.
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Yesterday
evening, in the process of refurbishing five very badly
treated Atari 800 computers I had a hunch and subjected a failed Pokey
chip (Atari Part CO12294 Wikki link https://en.wikipedia.org/wiki/POKEY
) to high heat by way of the barrel of my soldering iron until
saliva evaporated from it in about 1 second.
The chip, which did not work before in any of the machines now works
perfectly.
cross your fingers that it stays working. I performed a fix like this some
years ago with a ca.1970 chip from an SSI logic family from Sony. However,
it reverted to its failed state some weeks or months after the heat
application, long after (obviously) the chip had returned to ambient
temperature. So it wasn't merely that the chip was temperature sensitive,
the heat application indeed must have had made some internal alteration,
but it wasn't permanent.