More fried PWM fan MOSFETs (probably)
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It seems to be a pretty common thing to do, damaging the fan MOSFETs.
I had connected Fan 0 to a mini 12V step-down module (the Duet Wifi is running on 24V) but I'm an idiot and had it reversed (i.e. Fan 0 going into the "out" of the converter and the fan connected to the "in"). The fan worked for a bit but when I changed the speed there was a spark. Of course I had to make things worse by connecting it the right way round to Fan 1 and killing that too. Perhaps I'm lucky that I still have one working PWM fan output and there doesn't seem to be any other damage to the board.
The dilemma I have is that I don't possess a hot air gun and I don't think I need one except for this task. I could possibly buy a Duex2 for about the same cost; I could have a go with just a soldering iron; alternatively I could live with just one controlled fan if I had the extruder fan on 100% all the time.
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Maybe you can find someone who has hot air equipment and can replace the MOSFETs for you. Is there a makerspace or hackspace near you? Which country are you in?
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Yes, I apparently fried mine as well. I do get some voltage through, but only 7.75 on those that function and 0 on the others.
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Maybe you can find someone who has hot air equipment and can replace the MOSFETs for you. Is there a makerspace or hackspace near you? Which country are you in?
I'm in the UK but unfortunately don't know anyone into electronics. There is a FabLab here but they weren't keen on allowing the public in when I contacted them a while ago.
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If you PM me later this week I may be able to help.
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Thank you, I will do that.
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What Mosfet is a proper replacement? I can read the WK8 but not what is after it. is it uncommon for this to happen, I have around 200 hr on the board, thats it.
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https://duet3d.com/wiki/Connector_and_spare_part_numbers
The fan mosfet will blow if you short the corresponding output. Depending on the fan, it might also blow if you connect the fan wires the wrong way round.
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Found this with some help from Google, but no idea if its right, Google can be like WebMD you go in with a paper cut …next thing you know you're going to die.
https://www.digikey.com/product-detail/en/nexperia-usa-inc/PMV40UN2R/1727-1900-1-ND/5056345
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didn't see your response before I posted, thanks
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I also blew a couple of the fan mosfets, my fault , and was able to replace them without using a hot air station. I used a small pointy soldering tip and liquid flux and some small copper braid and no coffee before doing it. If you don't have much soldering experience I would suggest watching a few youtube videos on SMT removal without a hot air station and practicing on some junk electronics first.
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If you PM me later this week I may be able to help.
I sent a message (I think), hope you got it.
