From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264962AbTLKSfT (ORCPT ); Thu, 11 Dec 2003 13:35:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265113AbTLKSfT (ORCPT ); Thu, 11 Dec 2003 13:35:19 -0500 Received: from out008pub.verizon.net ([206.46.170.108]:62864 "EHLO out008.verizon.net") by vger.kernel.org with ESMTP id S264962AbTLKSfL (ORCPT ); Thu, 11 Dec 2003 13:35:11 -0500 From: Gene Heskett Reply-To: gene.heskett@verizon.net Organization: None that appears to be detectable by casual observers To: "Martin J. Bligh" , Jean-Marc Valin Subject: Re: Increasing HZ (patch for HZ > 1000) Date: Thu, 11 Dec 2003 13:35:08 -0500 User-Agent: KMail/1.5.1 Cc: Linux Kernel References: <1071122742.5149.12.camel@idefix.homelinux.org> <200312111218.35254.gene.heskett@verizon.net> <1316960000.1071164020@[10.10.2.4]> In-Reply-To: <1316960000.1071164020@[10.10.2.4]> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200312111335.08729.gene.heskett@verizon.net> X-Authentication-Info: Submitted using SMTP AUTH at out008.verizon.net from [151.205.60.44] at Thu, 11 Dec 2003 12:35:10 -0600 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 11 December 2003 12:33, Martin J. Bligh wrote: >> Hardware indeed. I'm a Certified Electronics Technician. Have >> someone check all those electrolyric caps in the on-board psu in >> particular, using a device similar to a "Capacitor Wizard" which >> measures not the capacity of the cap, but the caps Equivalent >> Series Resistance (ESR) at 100 kilohertz or more. Anything over >> half an ohm should be replaced forthwith. This assumes of course >> that your tech in charge of hot solder has the tools to do it >> correctly. If not, find one who does have the tools. >> >> Many mobos in a period ranging from about 2.5 to 1.5 years ago >> were built with caps that go defective prematurely due to a bad >> batch of them from several far eastern cap makers who were fed a >> bad recipe for the electrolyte in the caps, eg the Ethylene Glycol >> wasn't near pure enough. > >When you say "fed a bad recipe", didn't they actually steal it? Or >is that just an urban legend? > >M. Well, I *was* trying to be nice. I'd made the assumption that the supplier was the one doing the stealing, and that they (the cap makers as buyers of this cheaper than usual product) were not 100% aware of the problems at the time. Yes, I've read the story, and the history of capacitor failures over the last 2 years does seem to lend considerable credance to the story. When you are a CET, doing component level repairs for a living for the last 50 some years, some things do get your attention, and poor life of capacitors has long since become the single leading failure of things electronic, recently by a factor measured in magnitudes over anything else, like bad semiconductors. Thats been the tend for the last 10 years in fact. Poor lubrication of things basicly mechanical like electrical switches is now second on the list, with a lot of white space between them. The windshield wiper speed switch in your car being a prime example of that 2nd type of failure. If it hasn't miss-behaved, it will. Pull the knob off the end of the stalk and remove the super sticky syrupy grease there and replace it with lubriplate, end of problem, probably forever. Certainly for as long as you'll own it. Your trivia fact for the day :-) -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.22% setiathome rank, not too shabby for a WV hillbilly Yahoo.com attornies please note, additions to this message by Gene Heskett are: Copyright 2003 by Maurice Eugene Heskett, all rights reserved.