Re: Recap Help with P3TDDR motherboard - bad cap ESRs seem okay???

Just wanted to let you all know that I've now used the QVR caps to replace about 35 bad caps over three P3TDDR boards so far with great success (I've got about a dozen of these machines)! One of the boards just konked out yesterday... It wouldn't even post anymore. After the recapping, it's running beautifully again - hasn't even flinched! Some of the bad caps I pulled off were at 4 ohms or more, some that were starting to go bad may have been about .75 to 1 ohm or so. I don't know how great the quality of these...

Re: Recap Help with P3TDDR motherboard - bad cap ESRs seem okay???

Here's an interesting update. I just took off one of the bad looking NSRY caps from the motherboard, and the ESR meter immediately showed around 1.5 ohms. Each time I would try again it would edge up and seemed to settle (for now) around 2.8 ohms - kind of weird, but definitely a bad cap! Now here's what's really odd. I compared again to the QVS caps I have. When I measure them right from the base of the capacitor (as opposed to from the ends of the wires) I'm actually showing an ESR as low as .04 to .05 ohms!! When...

Re: Recap Help with P3TDDR motherboard - bad cap ESRs seem okay???

Actually, the vcore's on these motherboards are 1.7 V. Also, what do you mean by the hash on vcore? Is that like the ripple current? Also, what kind of scope do you need to check those stats (ie Mghz, etc)? Would something like the osziFOX work ([url]https://cdn.badcaps-static.com/pdfs/172901a4c293b920d5740fac761080af.pdf[/url])?Re: Recap Help with P3TDDR motherboa...vcore? Is that

Re: Recap Help with P3TDDR motherboard - bad cap ESRs seem okay???

That definitely sounds like the case then - they do always tend to be grouped together. But, thinking about that.. wouldn't it be then nearly impossible to ever detect bad capacitors still on the motherboard due to that very issue? It seems like they'd have to be taken out regardless to accurately test them. Regarding the Panasonics, so you're saying it's okay to change them to the higher 1500uF at the low 6.3V instead? I did see something about that in one of the FAQs. Is there any advantage to using lower voltage/higher...

I'm looking to recap several SuperMicro P3TDDR motherboards, as the NSRY 1000uF 10V 105degC capacitors all seem to be going bad. Some are bulging, some appear to have slightly leaked. Now here's the big question. I checked all these seemingly bad caps with a Bob Parker ESR meter, and even the seemingly bad ones are showing 0.03 to 0.04 ohms or so. So, does this mean that they are really okay, or is it possible that they are failing once under the strain of heat, etc. Note that all these boards still post, boot, etc. They just intermittently reboot, and I can only seem to trace it back to this...

Re: help with difference between ESR, LCR, and impedance meters

I just got specs to a "Digital LCR MultiMeter Inductance Meter Tester". Understanding correctly it seems to be able to check resistance at .1ohm resolution, but the lowest ohm reading seems to be in the 2(4)00 ohm range. So I guess that's the real difference, is that an ESR meter can measure under an OHM whereas most multimeters are measuring MUCH MUCH higher ohm levels. Feel free to correct me if I'm wrong in this understanding....

pardon the newbie question, but can someone explain to me the difference between an ESR, LCR, and impedance meter. Doesn't an ESR meter also measure impedance? I ask because it seems as if impedance meters seem much less expensive than the various ESR meters available, although I'm not quite understanding the difference. - thanks!