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I can't tell if you're just being snarky about the "Made in China" sticker or there's actually something wrong, but I don't see any visible damage.I think I found the problem. Look closely as only a trained eye can spot such defects.
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Are the MOSFETs you're referring to Q15 and Q16? It could be that the bootstrap capacitor on that rail isn't working, which would lead to the gate voltage still being low, which is consistent with what you're describing.I did get the new meter in and tested the voltage to the card and it holds 12.22v at idle and goes down to 12.21v when the screen loses signal and the fan spins up to 100%.
I also applied pads to the mosfets that were not originally padded like you had done in a previous posting and I am able to actually play a game.
Resident Evil Revelations is the game I was testing with, which uses both gpu's. Afterburner and Rivaturner are the programs I was also using to monitor temps, clock speeds and voltages.
I could play for forever while the cards voltage was at the stock .987 but once it started to fluctuate to 1.012 and 1.025 it only took approximately 15 seconds and it did the ol' no signal & 100% fan trick.
But yeah, adding pads to those mosfets definetly helped. I couldnt even get into a game before with this particular card.
And this was tested in the pc with the 875w power supply and i tested on both 8 pin connectors.
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The components you have circled in orange are the primary VRM controllers. As I recall, they should have a thermal pad from the factory. The components circled in blue near the center of the picture are the MOSFETs for the .95V rail. You shouldn't have to put a pad on them - when they overheat, you generally get that zero ohm resistor next to them burning out before they do, and they don't have any thermal monitoring to actually shut them off.Yes I did 15 - 20 and then two memory modules.
I borrowed a pic of yours to illustrate.
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I'm an electrical engineer for a living and I wish I was this organized and had enough of an idea of how the cards work to not literally go through every single component and look up a corresponding data sheet. This thread is awesome amd I am saving it.I build jets for a living, but could never get the EE part down pat. Enjoying this thread immensely.
This thread made me want to drag out a couple dead 7870s and try to get one working just for kicks. If only there was more time in a day!
I dont know! Honestly if you had asked me before I saw your thread I would have said yes immediately but now I'm thinking about tearing into them. I'll let you know if I can convince myself to let them goI have a few other similar threads where I've worked on some other cards, including a 290X (which is similar). Would you be interested in selling me those dead 7870s (edit: So I can share working on them here, obviously)?
The data sheets are usually pretty easy to find for cards as old as the 690, although you sometimes only get a vague pinout, and very little explanation of what anything does. On newer stuff, particularly the 10 and 20 series, some vendors seem to have come up with their own bespoke parts, and made the datasheets confidential, not unlike Apple and their ISL9240 that Rossmann likes to kvetch about.
The markings on U507 on my cards say "A219." Some cursory googling indicates you're probably right, that it's a Texas Instruments INA219.Hi RazorWind! I'm sorry to invade your post, but I think you could help me. I got a gtx 690, and I accidentally broke a component (U 507), which is the one in the red circle in the images. I think the component is a current monitor, specifically A219. Can you confirm what this component is by looking at your GPU?
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Thank you! I'll order some INA219 from texas instruments and try to fix my 690.The markings on U507 on my cards say "A219." Some cursory googling indicates you're probably right, that it's a Texas Instruments INA219.
http://www.ti.com/lit/ds/symlink/ina219.pdf
The real problem now becomes how to attach it, given that it appears that six of the pads got ripped off the board. The more instances I see where failures happen because something got scraped off the back like this, the more convinced I am that this is the real reason new graphics cards so often come with a metal shield on the back.
The black components are usually resistors. The tan components are usually capacitors of the multilayer ceramic type.Razor, after going over my own board (the 780Ti mentioned in the classified thread), I've kind of come to figure that the black top SMDs are resistors and the light brown, would that be true?
It depends on exactly where the components are. There are some places you'll see them used that have a specific value, per some published specification. For instance, if you look at the traces near the PCI-E connector, you'll notice there's a row of tiny caps that are in line with the traces, two for each lane. Those have a known value (100nF, I think?). Other functions also tend to have predicable values. 10K resistors are pretty common in pull-up aplications. 10 ohm resistors are common in pull down applications, and so forth.Thanks, yeah kind of tired here and didn't complete my own post.. light brown / tan being caps.
I wont bother asking if there's a way to guess the capacitance / operating voltage on the caps since there's no markings at all.. Techpowerup does have high res shots of the PCB, so at least i can figure out if i need a cap or resistor then. I'm assuming my only choice would be to remove caps from the donor board and test them with my meter..
I'm assuming that's what's caused the failure on the card.. The business side of the card survived transit due to having the heatsink on, but the back with no backplate clearly got rubbed against and took significant damage.. I know you can survive with 1 or 2 little noise filtering caps falling off.. but 10+..? sigh
I have a 690 that one gpu isn't working. The system sees it as a single 680I expected to see a 690 in an Easy Bake Oven! Jk, this is the kind of stuff I love to read about. Hope you keep posting updates, regardless of the results!
Can a defective 690 still function as a 680? Depending on the damage of course.