Thanks for the reply. :)
On of the first things I did was check the caps. I have replaced them on=20
a couple of other boards in the last year. One of my hobbies is: people=20
give me their older computers, I fix them up, load some basic software=20
and donate them, where someone puts them to use. Intel is warranting the=20
dead board, should have the replacement tomorrow. Cost $25 for next day,=20
but it includes a return shipping label that's worth probably $15. And I=20
get a box to ship it back in. :) I had to E-mail them a JPG of the=20
invoice. Other than my call to them, waiting 5 minutes, and 3 calls back=20
from Intel for details one step at a time, last one to get my credit=20
card #, was a pleasant experience.

On the other board, I made up 4 LED's with limiting resistors, plugged=20
them into unused floppy cable connector both the bad board and a running=20
one as baseline. Seems that the Motor Enable and Drive Selects for both=20
A & B are on where only B should be on. Quickly checking, there is no=20
short to ground or adjacent pins. Seems to be headed to a Super I/O chip=20
Winbond WPCD374L (around 100 pins) that is nearby on the corner of the=20
board. Don't think I want to tackle swapping that out, but maybe can=20
find someone locally if I can find the chip cheap enough. Rehabbed=20
boards are  $35 - $50 inc. shipping. Might even be better than a new=20
one. And comes with 90 return, so not worth a lot of time. If it's going=20
to do something, probably will in that time. Going to pursue that more=20
tomorrow, been a busy day. :)

On 3/12/2012 8:07 PM, cdb wrote:
> ::I have 2 defective Intel DP965_LT mother boards with issues:
>
> Sounds like this model or batchis one to steer clear of :)
>
> The first thing I would check is the condition of all the electrolytic
> caps. They may not be bulging, but in heavily used PC's the heat tends to
> get to them - if they are solid aluminium, heat stress is unlikely.
> Changing these could well get everything springing back to life.
>
> Note PC boards are at least 6 layer boards and the through hole caps are =
a
> pain to desolder and solder back in due to the copper earth layer.
>
> The SMD copper pads showing are probably components not required for that
> model or version of the board - a different version of the same model may
> well have those components fitted, so I wouldn't worry about bare copper
> showing.
>
> I wouldn't use a heat gun (if you are talking about a general purpose hot
> air gun) as often they can be too hot and components will desolder and
> board delamintates. An SMD heat gun might be OK for waving in general
> direction of SMD components that have no pins/pads visible in case a void
> or dry joint has become apparent.
>
> It very likely that your motherboards are using lead free solder, so if y=
ou
> see joints that look dull, this  may not be a dry joint but just how Pb
> free looks.  Soldering Pb free joints will take a little longer to get
> flowing if you are going to try and reflow with standard lead solder.
>
> Colin
> --
> cdb, colin@btech-online.co.uk on 13/03/2012
>
> Web presence: www.btech-online.co.uk
>
> Hosted by:  www.justhost.com.au
>
>
> This email is to be considered private if addressed to a named  individua=
l
> or Personnel Department, and public if addressed to a blog,  forum or new=
s
> article.
>
>
>
>
>   =20
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.