<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Nov 17, 2013 at 10:57 PM, David Ritchie <span dir="ltr"><<a href="mailto:deritchie@gmail.com" target="_blank">deritchie@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote"><div class="im">On Sun, Nov 17, 2013 at 8:04 PM, Jim Kinney <span dir="ltr"><<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">That's very useful but sort of sad. Caps are not supposed to be wear components :-(</p></blockquote><div>
<br></div></div><div>Well, a lot of these were produced by one major Japanese component company that evidently had built capacitors with the wrong <br>electrolyte. A ton of manufacturers had bad CPU boards that developed over time as a result. I have done a couple of motherboards and monitors <br>
repairs by replacing these, but it can be a bit tedious work (remove the motherboard from the cabinet to get access to both sizes, determine <br>the sizes and quantities of parts needed, order said parts, wait for parts to arrive, and install). I have found a place in Chamblee that carried <br>
</div><div>a lot of these part on hand, but it isn't very convenient to me comparied to UPS. <br></div><div><br></div><div>This problem also occurs on any device with electrolytic capacitors that does not have power applied to it for a while. A common thing with <br>
</div><div>ham radios is to bring up the device slowly on lower voltage to allow time for the electrolyte to reform, but it is far from a certain thing that <br>a very old capacitor will reform. Electrolytic caps are problematic over time in any cas. That is why you are seeing motherboards that <br>
advertise solid capacitors - they don't have this problem.<br></div></div></div></div></blockquote><div><br></div><div>I have seen the solid cap advertising but wrote it off as "advertising". Did not know of the aging issue with electrolytic capacitors. Must go dig of physics of this failure process now.<br>
<br></div><div>I remember the bad cap mess from the late 90's. Once company built a zillion bootleg caps (and supposedly used plain tap water). The builder for Gateway got hit hard with a vast quantity of these and Gateway nearly failed. HP, Dell and IBM also got hit. I had just received all new Gateway systems for the labs I ran at Emory when this hit the fan. The PC's we got were not affected but all the monitors failed within a month or so. Gateway just gave up and sent us new ones and didn't wait for the rest to fail after the first 6 of 30 died. The rest died about the time the truck backed into the loading dock with the new ones.<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div><br></div><div>-- David "Almost became an EE" Ritchie<br>
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