Re: Two graphic cards not detected by BIOS
Ok, I forgot that mosfets are connected to the circuit through their back. Sorry, momaka; but I'm afraid that I can't follow you (I can't see a mosfet as a straight line with A, B and C points).
I finally get the caps out from the red one and measured them: everyone is right. This card is in the same status: fan works, but mob doesn't detect it. PCIe pins cleaned again, and same result.
[URL="https://www.youtube.com/watch?v=4krZ5DHDzKw"]Measuring one of those capacitors out-circuit (youtube)[/URL]...
Bross
Member
Last Activity: 12-20-2018, 06:31 PM
Joined: 02-06-2017
Location: S.C. Tenerife
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Re: Two graphic cards not detected by BIOS
I attach a closer shot of the mosfet.
I agree that it should be connected to something more, but measurements are: about 1 ohm between gate and drain, between gate and souce, and no impedance at all between drain and source (in both directions). I guess it's broken anyway, because I see a diode between source and drain in its scheme. So I ordered a new 3310, but it will take a while (it's coming from China).
I'll post more news when I try new things in any of the graphic cards....Leave a comment:
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Re: Two graphic cards not detected by BIOS
Q223 = [URL="http://www.a-power.com.tw/pdf/Datasheet/ap3310gh.pdf"]3310HG[/URL]
This mosfet is connected to both fan connector pins (+ to the source with no impedance, and - to the ground with a little impedance). The drain pin doesn't reach the circuit.Re: Two graphic cards not detected by BIOS
Q223 = [URL="http://www.a-power.com.tw/pdf/Datasheet/ap3310gh.pdf"]3310HG[/URL]
This mosfet is connected to both fan connector pins (+ to the source with no impedance, and - to theLeave a comment:
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Re: Two graphic cards not detected by BIOS
Yes, about 1 ohm.
Yes, no impedance at all to both 12V rail and source.
Maybe this mosfet is faulty? There's about 1 ohm between source and gate (in PCB), but I don't know if that's right (or could be)...Leave a comment:
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Re: Two graphic cards not detected by BIOS
The fan is tested and working. I wanted to mean that I did the measuring in the (unplugged) PCB connector....Last edited by Bross; 10-07-2018, 03:50 AM.Leave a comment:
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Re: Two graphic cards not detected by BIOS
Thanks, Momaka! I'll test first the KZG caps in the red one first and, if it's still down, I'll try a reflow.
About the blue one, I'm embarrassed about what I'm going to say, but let's ask.
I made a Windows 7 performance evaluation with it, but I forgot to plug the graphic card fan connector. Openhardwaremonitor revealed about 76 ºC in the GPU after the evaluation, in calm, but reached about 104 ºC. I think 67 ºC more or less should be the maximum for this GPU.
After shutting down, plugged...Leave a comment:
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Re: Two graphic cards not detected by BIOS
Filed the Gigabyte (blue one) goldfinger contacts a little bit, and cleaned both graphic board goldfinger contacts with a mix of gasoline and diesel that we have here (we haven't isopropyl alcohol). The Gigabyte responded... can't believe that it was just that. I'm sure that I used ethyl alcohol and I think I filed last time as well. I'll make more tests and I'll let you know, but seems good.
About the Club 3D (red one), it didn't respond. I couldn't remove the caps and don't know why (I've already removed other caps, mosfets...Leave a comment:
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Re: Two graphic cards not detected by BIOS
I can't find here isopropyl alcohol (I'm afraid IPA is a bigger deal). I've asked to my father where I can find here (or any variant that can do the same), but he's out in a trip and I don't know when he will have coverage. Anyway, I haven't any humid problems here (the sun is present almost all the year). Just rust after some years. But anyway I'll try cleaning with that just in case. I think it's very difficult that the problem will be in mobs, because other graphic cards always work in them.
Tomorrow I'll test the KZG caps...Leave a comment:
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Re: Two graphic cards not detected by BIOS
Tested that fused (and two more than I indicate in attachments) and no impedance or very low. I'm afraid that it would be so easy
But that was the kind of ideas I was looking for!
By the way, I didn't realized that these are double-sided circuit boards. I attach new photos as well.
Any other typical component/s that makes graphic cards to die like if they aren't plugged in?
Another question. Components are identified in these circuit boards. I understand that F= fuse, C=capacitor and R=resistor....Leave a comment:
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Re: Two graphic cards not detected by BIOS
Because I live next to the ocean. So beautiful, but so bad for metal things -.-
Didn't notice that fuse, I'll check it tomorrow and I'll tell, thanks!...Leave a comment:
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Two graphic cards not detected by BIOS
Hi! I hope this is the right section, please let me know if it isn't.
I was doing a revision of what we have at home and found these two graphic cards. When I plug any of them in any of three working motherboards, the behavior is exactly the same as it isn't plugged in: not detected (the two ASUS mobs warns with one long beep and three shorts, and the AsRock, with integrated graphics, works with its own). Of course, I've already tested the same mobs with other several graphic cards and no problem at all. Maxmium W in PSUs are 450W, 460W and 750W: I'm sure that the problem is in... -
Re: Shorted Graphic Card Gigabyte GV-N580UD-15I Rev 1.0 (nVidia GTX 580)
If you open a new thread I think more people will see your question, this thread was about another graphic card with a broken mosfet.
By the way, I would search for that capacitor on the Internet, surely the Chinese people will sell them online. I would search on ebay.com and aliexpress.com, but I'm not quite sure what exactly should you type in. Maybe other members will see this and tell you.Leave a comment:
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Re: Shorted Graphic Card Gigabyte GV-N580UD-15I Rev 1.0 (nVidia GTX 580)
Hi again! It's been a long time, I know... the mosfet arrived some weeks ago, but I was a little scared and was moving it forward in my agenda
I guess ChaosLegionnaire was right: there's so much copper, so the point is heating all the card first and after sold or unsold. This was the idea that got me scared...
But I did, solded that mosfet in its place, annnnnd...!
Like Doc said in Back to the Future III, it's funny that such a little thing can be that...Last edited by Bross; 05-14-2017, 07:59 PM.Leave a comment:
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That little rebel VRM MOSFET: desoldering oddisey
Thanks, UHU! About capacitors, I'm 90% sure that this mosfet is shorted, so first I want to know if I can remove it. And unfortunately I haven't a second heat source, and anyway I think it has a isolation layer in the middle, hasn't it? Could work that with this card?
[ATTACH]153783[/ATTACH]
Anyway, I succeeded in an unexpected way. Finally, I got the flux. Tried with it, but nothing. My father was around in the place and told him about this. He thought it as possible to remove it just with heating pins...Leave a comment:
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Re: Shorted Graphic Card Gigabyte GV-N580UD-15I Rev 1.0 (nVidia GTX 580)
Ey ey ey, ChaosLegionnaire is from Singapore, this thread is not that Spanish!
Charlie, allllmost, I live in El Hierro I just indicated my province.
Ok, so I'm back, because I decided to try again (without the flux, it hasn't arrived yet). This time I used gloves (for the tweezers), foil (covering everything but the mosfet to remove, like the first time) and heat sinks in its corners, and more time of heat gun expose. It hasn't move a thing! With 2000W... here is a photo:...Leave a comment:
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Re: Shorted Graphic Card Gigabyte GV-N580UD-15I Rev 1.0 (nVidia GTX 580)
Great! Thanks, Drack, I'll let you know.Leave a comment:
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Re: Shorted Graphic Card Gigabyte GV-N580UD-15I Rev 1.0 (nVidia GTX 580)
Thanks to both! Already asked to momaka, and [URL="http://www.ebay.es/itm/162090334871?_trksid=p2057872.m2749.l2649&var=461050889370&ssPageName=STRK%3AMEBIDX%3AIT"]the flux seems to be a RMA[/URL] (for PCBs).
Hope I'll be able to pull out that rebel mosfet!
The idea I have in mind by the moment is to wait the flux (it will take a little time, it comes from China and it was shipped three days ago ) and try again with it.
Cheers!Re: Shorted Graphic CardLeave a comment:
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Hi! Another user recommended me to ask you about a desoldering problem. Could I know your opinion? I talk about it [URL="https://www.badcaps.net/forum/showthread.php?p=727631#post727553"]in this post[/URL].
Cheers!Hi! Another user recommended me to ask you about a desoldering problem. Could I know your opinion? I talk about it [URL="https://www.badcaps.net/forum/showthread.php?p=727631#post727553"]in this post[/URL].
Cheers!Hi! Another user recommended me to ask you about a desoldering problem. Could I know your opinion? I talk about it
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Re: Shorted Graphic Card Gigabyte GV-N580UD-15I Rev 1.0 (nVidia GTX 580)
That was that I thought, Drack; but including Charlie (I guess he's Spanish as well)
I made a little research of desoldering with heat gun in Youtube and finally desolder MOSFETs with this one:
[ATTACH]152119[/ATTACH]
First, I tried with two death motherboards (one per MB), and although the first one I guess I kill it (ups! open circuit between all pins or full short), the second one seems to be good. But when I tried it with the graphic card (with three layers of...Leave a comment:
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Re: Shorted Graphic Card Gigabyte GV-N580UD-15I Rev 1.0 (nVidia GTX 580)
Oh, right, Drack! Didn't know you were referring to heatsinks. I didn't take photos of the two heatsinks that this GPU has, but one of them touches the mosfets (you can see that heatsink in the photo, the dark part corresponds to them). Anyway, I'm not sure about the efficiency of that dark thing, maybe I'll add some thermal paste to the mosfets too when it's fixed.
[ATTACH]151602[/ATTACH]
Thank you very much to both! I have a painting heat gun, I think it will be enough. But maybe...Leave a comment:
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