Re: What caps for a Sparkle 9600 GT Cool-pipe?
Thanks for the reply. Yes, being in Europe is hard on the shipping costs. Actually TopCat has unbeatable prices, too bad he does not ship other electronic components. I'll see what is best.
amartolos
Senior Member
Last Activity: 01-09-2024, 04:38 PM
Joined: 08-18-2011
Location: Germany
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Re: Recapping a GA-M57SLI-S4 - advice needed
Thanks for the quick replies. I think I'll go then with the HMs for 1000uF/6.3V. I actually used them for recapping some Asrock boards, but in those cases they were replacing Ltec LZPs which are inferior to the KZGs.
For the Evercons I did not find HNs or FLs, but for the other boards I used Nichicon VZ 100uF/16V, I think they should work here too.
And... nVidia, underfill defect? I had to look it up because I had heard only very marginally about this. My head is spinning now: how many hidden problems are...Leave a comment:
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What caps for a Sparkle 9600 GT Cool-pipe?
This card has only 3 electrolytics on it. It still runs fine, but they make me feel uneasy. It has one UCC KZG with 680 uF / 16 V, another KZG with 470 uF / 16 V, and one Teapo SC with 100 uF / 10 V. At digikey I found Panasonic FM for the KZG's and FR for the Teapo, with the following differences: the 470 uF has ESR 0.038 Ohm, compared with the original 0.036 Ohm. The 100 uF has an ESR of 0.300 Ohm, compared with the 0.420 Ohm of the Teapo. Are these huge differences or I can live with them?... -
Recapping a GA-M57SLI-S4 - advice needed
This board is functional (at least boots up into BIOS, I did not install yet an operating system). It is however sprinkled with KZG's, and because of my bad experience with them I would replace them preemptively.
We have:
4x 3300uF 6.3V UCC KZG (10mm)
24x 1000uF 6.3V UCC KZG (8mm)
6x 470uF 16V TK ATWY (8mm)
I plan to order some parts for other projects from Digikey, so I'd put everything in one order. The closest I could find there would be Nichicon HM for 3300 and 1000 uF and Panasonic FM for 470uF.
My question is, will a higher... -
Corsair HX620W - dead APFC MOSFET
Recently I acquired this non-working Corsair unit. It is described very well here:
[URL="http://www.hardwaresecrets.com/article/Corsair-HX620W-Power-Supply-Review/371/1"]Hardware Secrets review[/URL]
and some additional info was posted [URL="https://www.badcaps.net/forum/showpost.php?p=126871&postcount=222"]here[/URL]. Mine has a Rubycon as mains cap.
The fuse (10A, fast) is blown, and also the inrush current limiter looks damaged. A schematic of the primary side was posted also at hardware secrets. The PFC switching is done...Last edited by amartolos; 12-21-2011, 03:14 PM. -
Re: Uniq LC-500E
After some time I managed to get back to my PSU. I managed to get the 5Vsb working using a TNY278P chip. I chose it because it needs a minimum amount of components (see schematic). It does not even need a feedback winding because it gets its power from the drain pin. Not even the two 560k resistors are needed for operation, they are required to prevent restart glitches when turning off AC power. And what's best is that the only required component is a 0.1uF cap, so it doesn't have to be electrolytic.
For implementing it into my supply, the datasheet...Leave a comment:
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Re: Unknown PSU - Uniq LC-500E - should I recap?
Wow, exactly what I wanted! Thanks for pointing to it, and thanks to Th3_uN1Qu3 for sharing the paper.Leave a comment:
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Re: Unknown PSU - Uniq LC-500E - should I recap?
Thanks for the reply. Actually, while it's not impossible to get another DM311, it won't be so easy, so I started to think about other chips I could use in its place. One question arises now: how do I find out what was the switching frequency of the original circuit? I see that this type of controllers work with either 67 kHz or 132 kHz. The Antec PSU I modded earlier obviously had 67 kHz, but is this the same for any SMPS for PC use? Searching for the standby transformer that this supply uses (EEL-19-2005, apparently meaning a EEL...Leave a comment:
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Re: Unknown PSU - Uniq LC-500E - should I recap?
I think it was the DM311 which was faulty (I probably overheated it when soldering the heatsink to the drain), because now, after several tests with different configurations, the feedback pin is shorted to ground. I somehow managed to kill it
What a bummer
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Re: Unknown PSU - Uniq LC-500E - should I recap?
I ended up by removing the R17 and R18 resistors and measuring them off board. They have values of 1.45 kΩ and 1.50 kΩ, respectively. I remembered having read in an [URL="https://www.badcaps.net/forum/showpost.php?p=98619&postcount=62"]earlier post[/URL] what resistor and by how much to modify, so I started decreasing the value of R17. For 1.18 kΩ the voltage comes up to 5.18 V, and the PSU starts when shorting the green wire, powering a 45 W resistive load.
However, a load of 3.8 Ω...Leave a comment:
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Re: Unknown PSU - Uniq LC-500E - should I recap?
I have made the DM311 modification to the PSU. The output voltage is now 4.62 V, so obviously something must be done to correct it.
The original 5Vsb circuit I posted earlier in this thread had some omissions. Here is the correct one. As I guessed, the diode D4 had the other orientation, and there was also a resistor in parallel with the C8 electrolytic. I also put in this new drawing the secondary circuit, as I may need to change it to get the correct 5V out.
I installed most of the components of the...Leave a comment:
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Re: Unknown PSU - Uniq LC-500E - should I recap?
Thanks for the post! You know, something has always to compensate for the lack of knowledge, in this case nice computer drawings
In the meantime I had a look over the datasheet of DM311 and some application notes; they recommend there a capacitor even in the range of 10-50 uF for the Vcc pin, so I thought I could also use the 22 uF capacitor at C8 (Nichicon) in the original circuit, not needed after modification.
I'll keep you updated about the progress.Leave a comment:
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Re: Asrock 939Dual-SATA2
One more comment: I would really put a fan to cool the northbridge area. gonzo0815 in his thread mentioned that the three capacitors there get very hot during the operation. There are also some power FETs soldered to the board, and on the backside one can already see a change in colour....Leave a comment:
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Re: Asrock 939Dual-SATA2
Concerning the fan headers and their capacitors, here are the promised pictures. I have also made pictures of the other Asrock board I have (K7VT4A Pro). I think the picture with the location of the northbridge fan shows best that a SMD cap should go to C152.
I am now wondering: is the 12V present at the fan header the same as 12V from the PSU, or it has gone through some filtering? And where would it be best to connect a fan, from the point of view of generated electrical noise?...Leave a comment:
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Re: Antec SL350P PSU
I also had the feeling that the plastic sheet stays in the way. If I think of it, it covers the fins of the heatsink, rendering them ineffective and creating in between small (thermally insulating) air pockets.Leave a comment:
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Re: Asrock 939Dual-SATA2
Wait, after I inspected more closely, I think a SMD ceramic cap should go in there. Actually, some pictures would be useful here. Maybe I can try and make some nice ones.
Sorry for my bad english, what I wanted to say was that improving the surface finish did not bring anything. CPU throttling works well, it slows from 2200 MHz to 1000 when idle, and also Vcore drops. Idle temp is ~30 °C and it goes to ~57 °C at full load (Opteron 175 CPU). At idle, one of the cores is 3-4 °C warmer than the other, but they are at the same...Leave a comment:
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Re: Unknown PSU - Uniq LC-500E - should I recap?
Recapping went without incidents.
Now, that I got the taste of it, I would like to install a DM311 circuit for standby, as I did with my Antec PSU. The original two-transistor circuit looks very similar to the circuit that everell gave as example in [URL="https://www.badcaps.net/forum/showthread.php?t=16071"]this thread[/URL]. Some differences that I noticed:
- there is no resistor in parallel with the electrolytic capacitor
- the diode D4 is inverted in my schematic. Maybe I...Leave a comment:
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Re: Antec SL350P PSU
Ok, you all convinced me. I took out the diode (STTH8R06D) to glue the foil on it, but in the process I managed to rip one leg off it. The only suitable replacement I found at the local shops was a rectifier containing two diodes with common cathode, but in the same package (TO-220), so I managed to install it by adjusting the positions of its terminals to the holes in the PCB, and I thus have one spare diode
Concerning the fan mod, a 2.4k resistor was too much, causing the fans to spin really fast and making a jet-engine-like...Leave a comment:
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Re: Asrock 939Dual-SATA2
Finally, managed to recap it. I can say that it is a robust mainboard, as it took a fair amount of damage during desoldering
, but it survived. I used the opportunity to lap the NB and SB heatsinks, as well as the CPU heatspreader and the cooler, but unfortunately with no obvious change in idle/load temps.
Oh well, here is the replacement list:
OST RMH 100uF/16V, positions 6,7,17,18,30,71,72,73,83,84,85 - replaced with Nichicon VZ
LTec LZP 1000uF/6.3V, positions 8,9,11,12,14,16,34,40,41,42,43,44,52,53,54,64,76,80,81,82,83,89,90,91,93...Leave a comment:
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Re: Asrock K7VT4A Pro
Well... I spoke too early. The above mentioned trick, while it worked on my Asrock 939Dual-SATA2, does not work for this one and keeps going into S1. I'm still trying, though...
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