[rescue] the cause of the dead cpus ?
Curtis H. Wilbar Jr.
rescue at hawkmountain.net
Thu May 15 11:29:57 CDT 2003
There are components on the back of the board <sigh>....
>Date: Thu, 15 May 2003 11:54:20 -0400
>Subject: Re: [rescue] the cause of the dead cpus ?
>From: Dave McGuire <mcguire at neurotica.com>
>To: The Rescue List <rescue at sunhelp.org>
>On Thursday, May 15, 2003, at 11:12 AM, Curtis H. Wilbar Jr. wrote:
>> If anyone was following the thread where I mention I ended up with a
>> of 10 "as is" (read "Dead") Slot 1 CPUs... I'm not sure but I have a
>> Many of them now seem to (not for any extended duration) test ok now...
>> the only difference is I'm using one of those metal clips to hold on
>> heatsink rather than those cheap plastic "pin type" retainers. I think
>> it is putting pressure on the CPU differently (and possibly stronger)
>> the heatsink and back casing.
>> What I'm wondering is if the solder connections of the actual CPU (a
>> BGA chip) to the slot 1 PCB is defective. So, when I use the stronger
>> clip to hold on the heatsink it is helping to compensate for bad
>> solder connections of the BGA chip to the board....
>> Does this sound realistic ? Don't suppose anyone out there has the
>> equipment necessary to reflow BGA soldered chips ? :-)
>> I wonder how I can verify this theory ?
> Yes, this is certainly possible. I have a reflow hotplate, but that
>will only be useful if there are no components on the back of the board
>and everything "meltable" (clips, etc) can be removed. We can give it
>a shot if you want.
>Dave McGuire "They live deeply, these vagabonds."
>St. Petersburg, FL -Goro
>rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
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