Broken 3090, repair? or sell for parts?

Falkentyne said:

He simply didn't have proper soldering experience.
My guess is that he either didn't flux properly, didn't flux after each step, or didn't heat the shunts enough for the solder to form a bond, because he was afraid of burning the shunts (this won't happen, the PCB ends up absorbing a great deal of the heat). But my biggest guess is because the GB uses 2 watt shunts, it has the same issue as the FE shunts--the conductive silver edges sit lower than the middle housing. So you have to first create a solder bridge on top of the original shunts on the conductive edges, using flux and heating up the shunt enough for the solder to stick to it, and then flux again, then apply the new shunt and then melt the bridge so the solder flows on the edges of both the old and new shunt. If the bridge isn't thick enough, then no contact will be made. So the bridge has to be above the height of the black housing, on each side. It's essential especially with 2W shunts that you use 3M Polyimide tape to solder mask the PCB to avoid accidents and have some desoldering wick available as well just in case.

It's a lot easier with 1W shunts (e.g. MSI, eVGA, Asus), since then you don't need an initial bridge at all and you can just bond the edges directly.

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Keninishna said:

I was able to run 3dmark and taking a look at hwinfo while the test was running gpu 8 pin 1 voltage was 10.6 and 8 pin 2 was 11.6 and port royal score is low.

View attachment 2516307

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Falkentyne said:

Something's up with the power readings.
GPU 8 pin 1 + 8 pin 2 + PCIE Slot Power should equal Total Board Power (GPU Power).

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Keninishna said:

I put back in my good old 1080 ti and both its input pins are reading 12v+ so I don't think its the PSU. The card might just have some resistance lowering the input voltage.

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Keninishna said:

I put back in my good old 1080 ti and both its input pins are reading 12v+ so I don't think its the PSU. The card might just have some resistance lowering the input voltage.

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Falkentyne said:

Spray some Deoxit D5 into the card's power pins (this is safe to do), then insert and remove the 8 pin connectors to clean them. They could be oxidized.
I have no idea if those readings are accurate or not, but if it is actually 10v, that's exactly why it crashes. But you would have to send the card to someone like Elmor or one of these guys like this guy:

https://www.youtube.com/c/NorthridgeFix

to see if there's a problem.

When my PCIE cable on my older Seasonic degraded, the 12v on my r9 290X read 11.25-1.137v at load which would cause, oddly enough, black screens and hard locks at light load. When I replaced that cable with a spare (daisy chained like the first one, which might have been why it degraded?), the voltage was back at 11.75v and no black screens. When I then used the final spare and had them separate 8 pin + 6+2 pin, same voltage, so my black screens were caused by too low 12v from the degraded cable.

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Hueristic said:

Sounds like you created a short somewhere thats loading down the supply.

Get a laser thermometer on their and find out what component is heating up and trace that back to where you made a bridge.

Don't run the card for long as you will cause all types of failures until you track this down.

If your not familiar with tracking down shorts you should send this card out to a professional rather than burning out the main die.

I'd recommend Loius Rossmans shop.



I watched some of NorthridgeFix vids and I'm not entirely impressed, I would go elsewhere.


Now this guy knows what hes doing.

https://www.youtube.com/channel/UCLqBEpeQPZTdhCd0nHWIf6g

Its a shame he seems to have disappeared.

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Keninishna said:

I have the card out and sitting on my desk so at least I'm not using it. That would make sense if there is a short somewhere but its also kind of odd it worked for months before it became a problem but maybe something finally failed. HWINFO shows the 2 input pins on my 1080ti at 12v so I don't think the psu cables are bad. I will take one more close look at it to see if I can find any obvious shorts if not then I will send it off for repairs. I will be sure to check out the vids, I did watch one guy on youtube repair a 3090 with a multimeter but his skills were better than mine as he tracked down a missing linear regulator and was able to replace it.

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Keninishna said:

So my gigabyte 3090 died on me. Basically it started dropping signal while gaming or under any 3d load and finally it stopped giving a signal on boot. It had been working fine for the past 5-6 months or so and I had it on a water cooling loop with a bykski block and temps maxed out at a little over 60c. I did shunt mod it pretty much right away by stacking I think 10mohm shunts, and the mod was working fine and the card was pulling a bit over 500w at max power. I've read other gigabyte and evga cards can get this issue as well so I'm not 100% sure if its related to anything I've done to the card.

I'm wondering if its worth fixing the card, either myself or if I should try to find a repair shop or just sell it on ebay for parts/repair. I've taken pictures of the pcb in segments to maximize the resolution so its easier to see zoomed in.

Back side.

View attachment 2515576
You can see the pcie power shunt on the left side here.
View attachment 2515575
Front
View attachment 2515577
View attachment 2515581

I know the shunt job is a bit sloppy but I wasn't aware of the edges of the shunts being lower than the resistor itself so it took a couple tries leaving burn marks and some left over flux. I bridged what I thought were the fuses with just blobs of solder to bypass them from being blown.

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Keninishna said:

I saw broken 3090s going for $800+ on ebay, which is better than nothing. warranty is void, I hear gigabyte warranty service is pretty bad anyways. I sent the card off to global priority so hopefully they can repair it.

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Hueristic said:

Sent it where?

I watched a few of that Tech Cemetery Guy and yeah he knows what hes doing.

Now you will hear him state here something that I also noticed on alot of these YouTube hacks just pushing voltage into a board and looking for the fire,

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Keninishna said:

I sent it to Global Priority Blog - Global Priority LLC

The tech cemetery guy is pretty sharp, his 3080 repair video he somehow finds 2x 0 ohm resistors that went bad and replaced them which fixed the card.

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