Re: Black screen in Windows after recap of motherboard.
Ok, thanks for the tip. If it's just a software issue I'm not too worried. The computer is updating now and if the problem doesn't go away after that I'll try the described fix....
Paddan1000
Member
Last Activity: 07-23-2014, 07:12 PM
Joined: 03-31-2013
Location: Lund
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Re: Black screen in Windows after recap of motherboard.
I bought them from Ebay, but I inspected them carefully and they are industinguishable from the real ones. They even have that small "v" imprinted on the vent. Their only flaw was that they had short leads. The high capacitance could be that they had been in storage since they were manufactured in 2007 and had deteriorated somewhat. After all the KZG series is a known badcap despite being japanese. I'm just doing this for practice anyway and don't want to spend more money than I have to.
...Last edited by Paddan1000; 12-28-2013, 11:43 AM.Leave a comment:
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Black screen in Windows after recap of motherboard.
I have a computer with a socket 468 motherboard that I found in a dumpster a few years ago. The computer has always worked perfectly but close to the processor I found two bulging caps that I decided to replace. The caps were 3300uF 6.3V Nichicon HM(M) and since there were four of them in total I decided to replace all four of them, despite only two of them showing visible damage. I left all the other caps alone. There was also some burn marks around the pin of the ATX socket where an orange (3.3V) and a brown lead goes. The original PSU was of really low quality (ACE Raw Deal 420W) and probably... -
Re: Beware next generation Chinese fake Sanyo WG!
Half a year ago I also bought Rubycons from Esold200 and got fake ones. When I complained he sent me new caps that were fake UCC:s.
I also bought a set of assorted Rubycons from the seller electronics-salon that were genuine as far as I could tell.Leave a comment:
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Re: ESR and regular caps?
I replaced all the caps at 100uF and lower (I left the 220uF:s) on a V-smile game console PCB with low-ESR caps. Now the game console won't start any games but just shows a blank screen. Could the problem be the low ESR of the new caps?
The PCB looks like this:...Leave a comment:
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Re: Qualitative analysis of Capacitors?
I just desoldered a 10V 3300uF Teapo capacitor from a FSP PSU that I bought in 2006 and have abused daily for about 5-6 years in a badly ventilated computer way too power hungry for it's rated wattage. It showed no bulging or leakage. The capacitance was 3600uF (9% above rating) and the ESR somewhere between 0,05 and 0,00.
Clearly Teapo (and the Capxon that also were present in the PSU) can't be as bad as people say if they survived all those years in a budget PSU without losing their specifications.Leave a comment:
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Re: Qualitative analysis of Capacitors?
I'm resurrecting this thread because I'm very interested in reading some reports where they compare caps of different brands and origins by having them endure standardized torture tests.
Most reports of bad capacitors seem to be anecdotal and usually involving 10+ years old capacitors made during the great capacitor plague.
If anyone know of any studies, please post a link.Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
It's like they took one property from each japanese brand cap and merged them into the perfect cap; Sanyo vent, ELNA bung, Rubycon sleeve and Panasonic date code. Let's hope they stole the electrolytic fluid from Nichicon...
As for my source, it's not like I have any alternatives if I don't want to pay $10 shipping for 2 caps. The other 15 caps I ordered were genuine Rubycon, so I just have to be more attentive in the future and weed out the occasional fake ones.
I did the same mistake...Last edited by Paddan1000; 04-20-2013, 01:55 AM.Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
1) The K-shaped vent is more like a Sanyo vent than a Rubycon vent.
2) The bung looks like an ELNA-bung and not a Rubycon bung.
4) The negative stripe on the sleeve doesn't line up perfectly with the negative lead on some of the caps.
3) The 10V 2200uF ZLH should have the dimensions 10x23mm and not 12,5x20mm according to the data sheet.
Still, no explosions from the PSU so far, the voltage is stable and all the caps were within specifications and deviated at most 2% from each other. If they are...Last edited by Paddan1000; 04-19-2013, 02:55 PM.Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
Oh no! I believe the 2200uF Rubycons I used are fake. I had to buy them separately since they weren't included in the Rubycon set I used for the others.
Still, the supposed fake ones are pretty consistent and the 8 leftovers are showing capacitance values between 2125 and 2175uF and ESR values between 0,05 and 0,02. The capacitance meter I'm using is a cheap chinese one, so these values are probably not very accuate but can be used as an indication of the state of the caps.
Here are some pictures. What do you...Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
My Youtube link seems broken and it's too late to edit the post. Here is a working one:
[url]http://www.youtube.com/watch?v=a6aUs2SW0aE[/url]
Anyway, I got access to a capacitance meter today and I tested some of the 20 years old Chton caps. Their capacitance of all the caps I tested were actually 10-15% higher than their specified rating (The 2200uF were 2400uF and the 470uF were 540uF). Is this a normal sign of aging, that the capacitance increases somewhat, or are these caps actually quite good in that they after 20...Last edited by Paddan1000; 04-18-2013, 08:09 AM.Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
I use it mostly for old MS-DOS games. I don't play much anymore, but I like to tweak the computer to be able to play the games at the highest settings. My efforts pay of mostly in the sound department and I have a collection of very rare sound cards and external MIDI modules (LAPC-I, AWE64 Gold, Ensoniq Soundscape Elite, MT-32, SC-55 MkII) that allow me to listen to the in-game music as high quality MIDI instead of regular Adlib FM music.
Here is a recording I made of Monkey Island that shows the difference in...Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
You were right about the multimeter!
It's a good quality one, but about 30 to 40 years old and therefore a bit worn. It appeared that the "diode test" button was jammed which added 1,5 volts to all readings.
I managed to unjam the button and get new readings. The new voltages are 5.01 and 12.07 volts, which makes the PSU better than new!
I think I'm going to give it a new Noctua fan while I'm at it....Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
I've replaced all the caps in the AT PSU now with Rubycons except the primary filter capacitors that were Japanese to begin with.
The computer works just as well as before, but when I measure the voltages they are way out of spec. The +5 rail is 6.45 volts and the +12 rail is 13.44 volts. Before the cap change they were 5.10 and 12.30 volts respectively.
Is this because the new caps could have a different ESR rating than the old caps and how will this affect the computer in the long run? I don't know the AT specifications, but...Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
I've ordered new caps now, minus the two big input filter capacitors that may continue to serve. I ordered mostly Rubycon 105 degrees, but I couldn't find any 50V 3.3uF ones. I ordered the 3.3uF as Samxon 85 degrees instead. Will they be fine or are they a weak link that will fail prematurely because of the lower temperature spec and the inferior brand? They are only one or two out of a 17 caps in total.
I've done a lot of experimenting with different RAM-modules in this computer and it's consistent in that it only accepts...Last edited by Paddan1000; 04-01-2013, 03:30 AM.Leave a comment:
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Re: Who makes the Chton caps in my AT PSU?
I was hoping that much, since it gives me an excuse to start improving, but perhaps they are really labeled "Chcon", as an abbreviation of "Chemi-con"?...Leave a comment:
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Who makes the Chton caps in my AT PSU?
I was worried that the AT PSU of my irreplaceable 486 contained bad capacitors and I opened it up to take a look. The two big ones were Nippon Chemi-Cons (picture 1) but all the small ones were labeled "Chton" or "Cnton" or something similar (picture 2). I have no idea if these caps are good or bad and I wonder if anyone here could identify them for me. The PSU is made in Taiwan by Ya Hsin.
The PSU also happens to be over 20 years old. Even if all the caps would turn out to be of high quality, should I replace the caps pre-emptively despite none of them showing...
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