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Old 03-06-2004, 03:07 PM
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White Powder on FETs, bad or normal?

Well, is it? I was reading somewhere that that means I fried the FETs. Don't worry, you will only be delivering annoying news to me, since when I ordered the reciever board, I got another board. I have a feeling I'll be in my basement tomorrow...
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Old 03-06-2004, 03:56 PM
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I am pretty sure thats just the thermal grease stuff, but I think I also saw somewhere that when its powder that its bad not 100% sure.


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Old 03-06-2004, 05:48 PM
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It is just the thermal grease. The thing to look for on a FET that is fried is a little pimple or hole in the top. (Obviously, you'd have to clean the thermal grease off in order to see it)
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Old 03-06-2004, 05:53 PM
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OK, I feel better hearing that from your keyboard. I read it on xmodworld, so I got a little worried. Good, because I might but a supra (failed 18v experiment, duh, the FETs were gonna fry), and put my "new" board in it. I want a domestic bodied x. BTT you write a reply, I'll still be listening to "In-A-Gadda-Da-Vida. What a great song.
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Old 03-06-2004, 07:35 PM
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acutally you should add more if anything. there can never be too much. unless your a moron and fill the entire chassis with it and use it for a lubricant for the diffs and gears. then you might have a problem.
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Old 03-06-2004, 11:02 PM
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Actually, more is not better. You should only apply a thin layer over the top surface of the chips. Any more than that actually decreases the thermal conductivity between the chips and the heatsink.
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Old 03-09-2004, 08:52 PM
jamiekulhanek jamiekulhanek is offline
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Coorect, thermal grease only fills the holes and improves conduction, a thick layer is a NONO.
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Old 03-09-2004, 11:35 PM
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i wanna add this: use arctic silver 5 thermal compound. is 99% silver but will not conduct electricity. tests done by those computer hardware review sites show that just by going from typical no name white thermal compound to arctic silver will drop the temps by a couple degrees fahrenheit and that could mean staying below or going past the maximum chip temperature. oh yeah, if the old FETs aren't fried and you don't wanna build neuro's external FET board, you could stack these FETs on top of the ones on the new board. cutting of the aluminum plate may be necessary. but that's only if you wanna run custom motors that would normally turn the FETs into a BBQ
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