Need help identifying a part on a GPU - Page 1
Forum section: electronics / repair

author: L3apr
author_rank: Newbie
timestamp: January 19, 2020, 09:52:42 am
content: I was a bit dumb and shorted 12v to a fan header on the GPU, nothing else exploded but a cap/diode/resistor, but i can't identify it so i can replace it, could someone help me?It's a MSI RX 580 ARMOR OC 8GBEDIT: Forgot to mention, this is just for the fan control, everything else works, and the fans kept working for a while with the broken part, so nothing else is broken, just this part

author: Twoflower
author_rank: Frequent Contributor
timestamp: January 19, 2020, 10:45:50 am
content: Why do you think that device is defect? Have you measured something? Some Graphic cards stop the fan if used in 2D mode or if under certain GPU temperatures. And this specific card has this feature. It's called in the MSI marketing speech "Zero Frozr". So probably everything is just fine.From the marking from the silk screen (B200) I would assume that is a ferrite bead. These are often used to filter the supply voltages. A defect of this would cut open the supply voltage for a connected dcevice -> no functionality at all. So I don't thing that this is a defect.

author: L3apr
author_rank: Newbie
timestamp: January 19, 2020, 10:47:20 am
content: It's exploded, this is just a pic i got from the internet, and fan control is set to 100% yet o movement, and it slowly started to go slower and slower after i exploded it. Also it says M8200, not B200

author: mikerj
author_rank: Super Contributor
timestamp: January 19, 2020, 11:28:42 am
content: Quote from: L3apr on January 19, 2020, 10:47:20 amI suspect it actually says MB800 given the other designators nearby. It is most likely a ferrite bead, though no idea what value it is but I doubt it's critical.

author: Twoflower
author_rank: Frequent Contributor
timestamp: January 19, 2020, 11:42:20 am
content: Too bad. In that case I can't help further. Sorry.But some notes: After some tries to match the labels I'm not sure which one actually denotes the device. What you see as M8200 is probably MB200 as the second char after a M is usually a letter on the PCB. Looking closely at the print it looks like mounting options: Horizontal MR200, vertical MB200. But I'm not sure what the NR200 is. Eventually not mounted at all (for passive cards?) or two options each orientation: B200/MR200 horizontal and MB200/NR200 vertical. While R for resistor B for bead. But that's now wild guess and does not help to solve your problem.

author: L3apr
author_rank: Newbie
timestamp: January 19, 2020, 12:11:01 pm
content: Quote from: mikerj on January 19, 2020, 11:28:42 amI measured the connection and nothing seems to go to ground, could i just short it for the moment and see if it works?

author: mikerj
author_rank: Super Contributor
timestamp: January 19, 2020, 12:56:15 pm
content: Quote from: L3apr on January 19, 2020, 12:11:01 pmYes, shorting it out should be fine if it is actually a ferrite bead. I'd suggest trying to find similar parts on the board (i.e. same designator) and checking they have very low DC resistance which would imply they are ferrite beads.

author: L3apr
author_rank: Newbie
timestamp: January 19, 2020, 06:36:43 pm
content: I just soldered it up and worked perfectly, it was an inductor after all, so it was perfectly fine without it, thanks for the help!Mods can close the topic.