This is a Panny cap I got from Digi Key, I know it's within the 20% margin but it seems pretty low and the ESR seems a little on the high side too. It's going into an OCZGXS700
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Re: Did I get a dud primary cap?
I don't think you got a dud.
It's probably a consequence of how the capacitance checking is performed, the voltage used is probably very low, and since it's a 450v rated capacitor... -
Re: Did I get a dud primary cap?
It's actually 400 V only. Is it safe for active PFC? I usually see 450 V lately as the boost can go to as much as 400 V.Less jewellery, more gold into electrotech industry!
Half of the computer problems is caused by bad contacts 
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Re: Did I get a dud primary cap?
It's possible because the one that failed was a CapXon with the same value, although it's hard to say cause it's CapXon
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Re: Did I get a dud primary cap?
My bad, I wasn't paying much attention. 400, 450... not much difference, the point is that these meters use 0.2v or somewhere around that value to send pulses into the cap and measure how fast they discharge or something like that, to determine the capacity value. Sorry for not being more accurate with explanations.. I'm messed up, just arrived here to my place after visiting my parents so I'm all tired from the train ride and cold weather.
With a capacitor rated for such high voltage, it's possible that they get a wrong capacitance value.
Do a test if you want with some 2.2 - 10uF 400-450v capacitors and you'll see they should be overestimated, the meter will say they have more capacity than what they actually have.
I've tested my esrmicro against the Uni-t UT61E which if I remember correctly uses about 0.5v pulses and gets closer to the real value imho.Comment
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Re: Did I get a dud primary cap?
Might have also just sat a while, maybe is just needs a good re-forming
Muh-soggy-kneeComment
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Re: Did I get a dud primary cap?
Thanks for the replies, I'm sure it will be fine! I can just be paranoid sometimes
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Re: Did I get a dud primary cap?
Actually, the TS-UQ series datasheet says that the 470uf - 400v caps have an esr of:
120Hz - 0.423 ohm
20kHz - 0.212 ohm
So, again, its probably OK. The TS-UQ series isn't supposed to be ultra-low esr either.Muh-soggy-kneeComment
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Recapping the power supply board for a Samsung 305T monitor, everything is Capxon except 2 Rubycons. I can't find data sheets matching these online, so don't know what ripple numbers, impedence, etc, to look for. There are a few different looking GL series data sheet PDFs, but the listing that matches the capacitance and voltage is a much bigger case size. I've narrowed down selections with lead spacing and case diameter, and what's in stock at Digi-key
1 x Capxon 1000uf35v GL C720(is this a part number or batch number, can't find it anywhere) 105c
1 x Capxon 1000uf35v... -
Hi guys
I have a faulty Xilence ATX PSU here
The fault basically is I have two short circuit power transistors on the primary side of the large SMPS transformer - they are 2SC3320.
There is another smaller transistor on the primary side C3866 which tests ok
The PSU has three transformers - it looks like the 2SC3320's drive the big one and the C3866 drives one of the small ones. There is a separate PFC PCB with it's own controller and MoSFETS
There is also a short on the 3.3V output and a near short on 5V - I suspect this probably blew... -
This is a possibility, but future PC motherboards could only require a single 12V primary rail with +3.3V/+5V (-12V is only required for PCI slots (and certain cards thereof) but not PCI Express slots) switching regulator circuitry (which is now quite compact for their high output) on the motherboard with SATA power output connectors on the motherboard.
Most newer ATX (and related counterpart) power supplies over a certain wattage typically have a single primary rail of +12V which is then connected to independent +3.3V/+5V/-12V switching regulator modules; also, many hot swap server PSUs... -
I'm using Xiaomi Router 4A gigabit edition as wireless repeater. It worked fine for 2 years or so, but last week, wireless started to disappear.
When I unplug/replug the power, it was working fine for a day/half a day or so until it freezes again.
After testing with different power supply adapters and concluding it wasn't the issue I finally opened the case and this was the situation:
Anyway I proceed to clean up the mess and replace all caps but unfortunately it made the situation worse. Now router can't even boot, either it freezes during... -
Hello
I'am a beginner in electronics repair and i got some trouble to find what's goning on a computer. It is a lenovo yoga C940-15IRH laptop and the screen doesn't work anymore, but that work on an external one
the screen seams to be hard to unbuild properly so i want to test it by other way
how can i be sure if the signal is really send to the screen ? i did some check on screen connector on LCD1 got 19v and on MiC1 connector on the other side of the screen (dunno if it's for the screen itself or other thing) got a lot of 3.2v pin
did u got...
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