Some time back I did an article here about leaky capacitors and linked to some really great photos of a “healthy” mainboard capacitor and “bulging” capacitors. The long-story short version is this… Once upon a time there was some corporate espionage among capacitor manufacturers. Someone had a really good electrolyte formula (the goo inside a capacitor) and the other companies wanted it. Well, what they wound up getting was not the real formula, but a fake. So… any capacitors made with the false formula will be more likely to fail. In fact, it’s as though over time the electrolyte expands causing the capacitors to bulge and in some cases leak. Why is this computer related? Because if you crack the cover of a pc and look there are dozens of electrolytic capacitors on the mainboard.
Tag: capacitors
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Reinventing the capacitor
These days, big inventions aren’t entirely new creations, but improvements on an old idea. This latest in a string of interesting science/technology breakthrough stories is about just that. Researchers at MIT (how many sentences have I started like that this week?) have developed a new way of constructing a capacitor. One of the limiting factors with HOW much charge a capacitor stores now is the surface area of the “plates” that hold charge. The greater the surface area, the greater the charge. What they’ve done is laced the surface with nano-tubes, greatly increasing the surface area. One writer compared this to a fuzzy bathroom towel soaking up more water than a flat cloth. Probably not a bad analogy. What makes this significant….
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Sometimes the simplest things solve problems….
How many times have I had this kind of phone call…. “my computers not working”… “the light on the monitor is on, but there aren’t any lights on the keyboard. everything seems connected, but there’s nothing on the screen.” Usually, my first question is along the lines of… “have you tried turning it off and back on.” I sometimes hear “I can’t use the start button” or something like that. At this point, I suggest that they try disconnecting the power and letting it sit for a few moments (5-10 seconds is usually enough.) Plugging it back in and trying the switch.
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Basic Hardware troubleshooting
Sometimes machines stop working, or you install a new piece of hardware and just can’t boot again. That’s when you have to get back to some basics to troubleshoot what the problem is. Yesterday I saw a machine that wasn’t booting. It would display the splash screen and then power down. They had a new video card on a previous diagnosis using the indicator lights on the back (Dell). The add on card seemed to work, but the system was just not booting. Someone had suggested to them that it was a power problem.
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Bad capacitors causing strange system behavior
This is, in fact something I’ve been getting ready to do an article on soon. I had a system that had very strange and random problems that I’ve visited and tried many of the typical fixes for, in fact I think I saw it a couple times a week and either couldn’t reproduce the errors on demand, or could only get an error once, do something and not see it again, then hear about something similar the next day…
Anyway, ultimately the system has been replaced (and it’s twin…) on inspecting the motherboard post-pull, there were some interesting issues with the capacitors, yellowish crusty leaked electrolyte… uh-huh, that explains everything…