[Coco] 2 wasted cpus?

[camillus Blockx]

The best way to know if your cpu's are busted is to put them in an other
coco and test it.

Also worth to mention is when you placed the machiened socket did you
solder it on both sides?
Go with a thin solderwire and add a little more solder tobottom and top
side on the pins of the cpusocket.
This makes sure that plated thrue holes are making goodcontact. Use also a
fine solderpoint for this.

good luck

( I would like to help you, but I do not know if you live close to Indiana,
Valparaiso area )
You can buy a coco 3 128k for $75+ S/H, so don't know if you want to send
your board to me, I test and if damaged try to repair it, and send it back
to you. The cost would only be Shipping and parts, if needed.

Just let me know ok

camillus



On Thu, Mar 7, 2013 at 2:32 AM, Arthur Flexser <flexser at fiu.edu> wrote:

> 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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