[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[no subject]
>I think that's either a regulator IC or a power transistor.
>
>Jeff
>
>On Tue, 2005-06-14 at 22:16 -0400, James P. Kinney III wrote:
>
>
>>WooHoo! Nice pics of dead hardware!
>>
>>That stuff is power component devices. Likely a capacitor used to trim the
>>power to the CPU (they are often the largest things on the board).
>>
>>If I recall, you had some power supply issues with this rig earlier. It is
>>likely that the PS was failing and cracked/nearly blew the case open on
>>the cap. The new PS is fine but the on-rush of current was the end of the
>>part.
>>
>>The _bad_ news is you are likely not going to get a new mobo on a warranty
>>return. Unless the board was super expensive it's not worth a claim to
>>insurance.
>>
>>As to tv tuner cable being the source of the power spike, Yes! It CAN happen.
>>
>>My first system that I bought myself was toasted during a lightning strike
>>that was too close to the phone line. The box was OFF and UNPLUGGED but
>>the phone line to the modem was still in and the modem was serial port
>>cabled to the box. Chips were exploded in the modem, the mother board had
>>burn marks all over it between traces and the hard drive heads were welded
>>to the drive.
>>
>>More recently, lightning hit a tree outside my office (~5' from where I
>>was standing!!). The EMP wave trashed all sorts of things. It induced a
>>high voltage on wires like the Cat5e all over the office. That destroyed
>>NICs and routers and switches and (I'm convinced but lacking direct
>>evidence) the untimely dead of motherboard and hard drive 2 days later.
>>I'll never forget seeing a pair of flourescent light tubes that were still
>>in the plastic wrap leaning against the wall lit up like they were running
>>at 500W instead of 35W! That was what let me figure out that the EMP
>>induced an electric field over 5kV! All of my surge protectors were
>>unphased. Even the first line of one shot wall wart protectors.
>>
>>So a very nearby lightning show even with great surge protection can wreak
>>havoc.
>>
>>
>>
>>>Guys,
>>>
>>>After examining the mb with a flashlight, I found the culprit.
>>>
>>>See:
>>>
>>><a rel="nofollow" href="http://www.sourceillustrated.com/mb_1.jpg";>http://www.sourceillustrated.com/mb_1.jpg</a>
>>><a rel="nofollow" href="http://www.sourceillustrated.com/mb_2.jpg";>http://www.sourceillustrated.com/mb_2.jpg</a>
>>>
>>>Ok...now for real technical lingo here...
>>>
>>>Of the four square thingies with the silver circle in the middle, notice
>>>one is most definitely *not* like the other. First, what is this fried
>>>and charred thingie? Second, does this look like it may have resulted
>>>from a lightning strike (we had some good ones here this weekend). I have
>>>the box behind a good surge protector and UPS, but like a DAU I have cable
>>>running directly into a tv tuner card with no surge protection, so I'm
>>>wondering if that may have provided a clear path.
>>>
>>>Interested in learning your thoughts. Thanks again for the help!
>>>
>>>John
>>>
>>>_______________________________________________
>>>Ale mailing list
>>>Ale at ale.org
>>><a rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale";>http://www.ale.org/mailman/listinfo/ale</a>
>>>
>>>
>>>
>>_______________________________________________
>>Ale mailing list
>>Ale at ale.org
>><a rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale";>http://www.ale.org/mailman/listinfo/ale</a>
>>
>>
>
>_______________________________________________
>Ale mailing list
>Ale at ale.org
><a rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale";>http://www.ale.org/mailman/listinfo/ale</a>
>
>
>
Seems like a power transistor (probably a MOSFET) for the switch mode
regulator. Typically used to drop the 3.3 Volts down to the 1.4-2.0
volts used by most CPUs. That circuit is pretty far in from the outside
world. If I had to take a guess two things might have happened, it was
shorted by a screw or some other piece of metal or the least likely one
of the capacitors shorted and caused an over current situation. Either
way motherboard is bye-bye. Sorry.
Calvin...
</pre>
<!--X-Body-of-Message-End-->
<!--X-MsgBody-End-->
<!--X-Follow-Ups-->
<hr>
<ul><li><strong>Follow-Ups</strong>:
<ul>
<li><strong><a name="00608" href="msg00608.html">[ale] Pictures of the culprit (was OT: Diagnosing HW problem)</a></strong>
<ul><li><em>From:</em> esoteric at 3times25.net (Geoffrey)</li></ul></li>
<li><strong><a name="00621" href="msg00621.html">[ale] Pictures of the culprit (was OT: Diagnosing HW problem)</a></strong>
<ul><li><em>From:</em> ratcheson at earthlink.net (Richard Atcheson)</li></ul></li>
</ul></li></ul>
<!--X-Follow-Ups-End-->
<!--X-References-->
<ul><li><strong>References</strong>:
<ul>
<li><strong><a name="00543" href="msg00543.html">[ale] OT: Diagnosing HW problem</a></strong>
<ul><li><em>From:</em> jb at sourceillustrated.com (John Wells)</li></ul></li>
<li><strong><a name="00551" href="msg00551.html">[ale] OT: Diagnosing HW problem</a></strong>
<ul><li><em>From:</em> jb at sourceillustrated.com (John Wells)</li></ul></li>
<li><strong><a name="00557" href="msg00557.html">[ale] OT: Diagnosing HW problem</a></strong>
<ul><li><em>From:</em> jkinney at localnetsolutions.com (James P. Kinney III)</li></ul></li>
<li><strong><a name="00558" href="msg00558.html">[ale] OT: Diagnosing HW problem</a></strong>
<ul><li><em>From:</em> jb at sourceillustrated.com (John Wells)</li></ul></li>
<li><strong><a name="00560" href="msg00560.html">[ale] OT: Diagnosing HW problem</a></strong>
<ul><li><em>From:</em> cfowler at outpostsentinel.com (Chris Fowler)</li></ul></li>
<li><strong><a name="00561" href="msg00561.html">[ale] OT: Diagnosing HW problem</a></strong>
<ul><li><em>From:</em> jb at sourceillustrated.com (John Wells)</li></ul></li>
<li><strong><a name="00562" href="msg00562.html">[ale] OT: Diagnosing HW problem</a></strong>
<ul><li><em>From:</em> mdhirsch at gmail.com (Michael Hirsch)</li></ul></li>
<li><strong><a name="00572" href="msg00572.html">[ale] Pictures of the culprit (was OT: Diagnosing HW problem)</a></strong>
<ul><li><em>From:</em> jb at sourceillustrated.com (John Wells)</li></ul></li>
<li><strong><a name="00586" href="msg00586.html">[ale] Pictures of the culprit (was OT: Diagnosing HW problem)</a></strong>
<ul><li><em>From:</em> jkinney at localnetsolutions.com (James P. Kinney III)</li></ul></li>
<li><strong><a name="00588" href="msg00588.html">[ale] Pictures of the culprit (was OT: Diagnosing HW problem)</a></strong>
<ul><li><em>From:</em> hbbs at comcast.net (Jeff Hubbs)</li></ul></li>
</ul></li></ul>
<!--X-References-End-->
<!--X-BotPNI-->
<ul>
<li>Prev by Date:
<strong><a href="msg00602.html">[ale] OT?: PPPoE Topology</a></strong>
</li>
<li>Next by Date:
<strong><a href="msg00604.html">[ale] OT?: PPPoE Topology</a></strong>
</li>
<li>Previous by thread:
<strong><a href="msg00588.html">[ale] Pictures of the culprit (was OT: Diagnosing HW problem)</a></strong>
</li>
<li>Next by thread:
<strong><a href="msg00608.html">[ale] Pictures of the culprit (was OT: Diagnosing HW problem)</a></strong>
</li>
<li>Index(es):
<ul>
<li><a href="maillist.html#00603"><strong>Date</strong></a></li>
<li><a href="threads.html#00603"><strong>Thread</strong></a></li>
</ul>
</li>
</ul>
<!--X-BotPNI-End-->
<!--X-User-Footer-->
<!--X-User-Footer-End-->
</body>
</html>