[Coco] 2 wasted cpus?

[Arthur Flexser]

It's also conceivable that you have a cold solder joint, depending on
how exactly you tested continuity.  (Another possibility is a cracked
or damaged trace on the motherboard.)  Try testing the continuity
between each pin and someplace the trace beneath it goes to.  If you
just tested continuity between the pin and the glob of solder beneath
it, a cold solder joint might not be detected.  A close examination
under a magnifying glass might turn up a problem more quickly.  So
might reheating all the connections to see if the problem goes away.

Art

On Thu, Mar 7, 2013 at 1:02 AM, Retro Canada <retrocanada76 at gmail.com> wrote:
> just got my 2 mc68b09e cpus from jameco. removed the defective cpu from my coco2, installed a machined socket but when i test both cpus all i get is garbled screeen. with vdg checkerboard and at signs. the same if i remove and turn it on without the cpu.
>
> i checked the continuity on all pins seems fine. cpu is receiving 5v and making some heat.
>
> so did i get 2 busted  cpus?
>
> Sent from my iPhone
>
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