K404 Posted September 8, 2020 Share Posted September 8, 2020 Hello all I have a GPU problem that i'm running short on ideas on how to solve. It's an MSI GTX980 Gaming edition card, picked up faulty on eBay. It briefly worked, but a shunt resistor fried under load. (Panasonic ERJ-M1WSF5M0U) i've replaced it twice, but insta-fry upon power up. Could there be damage to the current detection IC that the shunt is connected to? They are V3505's if i'm looking at this correctly... I don't know much about them and as of yet, I can't find spares. I can find replacements for the shunt resistor and I've thought about buying higher-rated ones..... with a lower resistance for a power limit workaround..... but without having a better idea of what's wrong, I don't think that's very...... informed. Any pointers would be very welcome Thanks. K Quote Link to comment Share on other sites More sharing options...
TerraRaptor Posted September 8, 2020 Share Posted September 8, 2020 Current sensing IC shouldn't be able to fry shunt. Most likely there is short circuit with mosfets. I would fix shunt, connect lab PSU to 12V rail, set it 1v 10A and check what is hot in VRM zone. 1 Quote Link to comment Share on other sites More sharing options...
K404 Posted September 15, 2020 Author Share Posted September 15, 2020 Thankyou for the input on this I wasn't looking at the card correctly because I don't (yet?) have the experience with newer PWMs. Made some progress, but the card has had an awful life. It's currently not an 8-phase PWM, put it that way! Quote Link to comment Share on other sites More sharing options...
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