Bad bad capacitors

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Karlsweldt
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Post by Karlsweldt »

The drama continues on a semi-sour note! The newer ASRock Conroe 865PE was still having problems with a complete boot path. Decided to get a new video card, an nVidia GeForce 7600GS AGP 8x 512 MB (New, eBay bargain!) Put it in, lo and behold no hiccups.. full boot on first try!!
Checked the old nVidia 6600, guess what. A BAD CAP on it!! It was a 470 mfd 16volt 'purple' SACON branded one. The others look good, replaced the bad one. Now seems to be OK on another system. Thinking about putting back that P4 3.4 CPU and see what happens.. but concerned that it runs a bit too warm.
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evasive
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Post by evasive »

HP L1906 monitor suffers too. CapXon capacitors.

There is a description here on how to open the L1906:
http://h30434.www3.hp.com/t5/Desktop-Mo ... td-p/70597

Because no service manual for the L1906 can be found so far. Will let you know the results.

edit: description is indeed enough, just need to replace 3x 1000uF/10V ones, the others are a different brand.
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Post by evasive »

Next victims, a Medion monitor MD 30399 PJ with one SAMXON capacitor blown, which is odd, this brand has a good reputation, will check the voltage regulator nearby.

edit: and not just the voltage regulator, there's more stuff blown, this one is beyond salvage. Not the samxon cap after all then.

And a Trust 370W power supply no 14885. ALL caps are blown in there, "Forever" and "Canicon" capacitors.
Last edited by evasive on Sun Nov 06, 2011 2:59 am, edited 1 time in total.
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Post by hunter1801 »

Just noticed this thread was called "Bad bad" capacitors. Now my OCD is going nuts because I can't take out one of the bad's.
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evasive
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Post by evasive »

OCD?
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Post by Karlsweldt »

Have to add another sorry tag to this post.. now it is Sanyo branded 6.3 volt, 1500 mfd capacitor group on an nVidia 7800GT video card I was using in a newer system! Luckily, I had some new spares on hand.. and after recapping the video card with three new ones, all is well again.

This system was my old Chaintech 848P with a Pentium 4 Prescott /3.2/HT/800, now set up with Windows XT Home. Only 1 GB of memory, but should be a decent system for the [email protected] regimen. Maybe next year I can afford a more modern setup.
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Post by Karlsweldt »

..And yet again..
Recently had powering on problems with my old Creative Blaster Slot 1 P III setup. On digging into the system, I noted that the fans were turning slowly.. even when the PSU should have been at idle! A voltage check showed about +2 volts on the +12 volt rail, and about +1.5 volts on the +5 volt rail!!
A change of the PSU to a known-good one did not clear the start problem, but voltage readings were now 'normal'. Then noted two bad caps next to the memory slots.. 10v/1000mF green caps, branded "I Q" that were bulging. Replaced the caps, and all is good again. Would be a mournful wail if this i440BX board were to die!
As to the PSU, on opening it found at least 8 small filter caps plus the two main primary caps bulging. It was a "Comp USA" branded unit, dating from 2006!! The secondary caps were branded "Rulycon", black with a "K" embossed top. Guess that age does have its effects on capacitors, too. Not worth fixing. Trebuchet ammo? Image
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Post by evasive »

10v/1000mF green caps, branded "I Q"
Pics please, sounds like we need to update the bad brands list.


Rulycon is a [email protected] attempt to resemble Rubycon.
I hope their factory blows up.
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Karlsweldt
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Post by Karlsweldt »

These latest 'failures' are dark green, a "Hunter Green" color. The logo on them is "I.Q" in Italic font. Marked as 105° but no "low esr" marking. Will try to Email you a photo tomorrow. Identical caps nearby look to be in good shape. At least 8 of them in total.
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Post by bdub »

evasive wrote:OCD?
obsessive-compulsive disorder... in this case he sees the mistake he made, which causes him uneasy, distressing, intrusive thoughts about fixing it, but he can't. in higher order OCD patients, constant reminding of this failure could cause mental collapse.
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