<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">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>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><br></div><div>-- David "Almost became an EE" Ritchie<br></div></div></div></div>