[Coco] 2 wasted cpus?

[Luis Antoniosi (CoCoDemus)]

i applied only to one side, it's is very difficult to put solder on top,
you can't reach with solder tip, and the socket's round metal legs covers
the solder points. I use a socket like these:

http://image.made-in-china.com/43f34j00uBeapAfrfwqm/IC-Socket-Machined-Pin-0110-.jpg


But I tested the traces from top and bottom and all seem to have continuity
until their components or vias.

sending the board to you probably would cost more than buying anoter coco2
on ebay. I already have a coco3, I just want to fix my coco2b. Thanxs for
the help.

Felipe.



On Thu, Mar 7, 2013 at 12:58 PM, camillus Blockx <camillus.b.58 at gmail.com>wrote:

> 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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> >
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> >
>
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