03-06-2004, 03:07 PM
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It's Really Fast!
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Join Date: Apr 2003
Location: Oradell, NJ
Posts: 1,034
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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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03-06-2004, 03:56 PM
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Registered User
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Join Date: Jan 2004
Location: Houston
Posts: 99
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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.
Peace 
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03-06-2004, 05:48 PM
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Mad Scientist
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Join Date: Oct 2003
Location: Buffalo, NY
Posts: 901
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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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-- It is by will alone I set my mind in motion...
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03-06-2004, 05:53 PM
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It's Really Fast!
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Join Date: Apr 2003
Location: Oradell, NJ
Posts: 1,034
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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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03-06-2004, 07:35 PM
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I'm not a pyro, really.
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Join Date: Jul 2003
Location: Little Falls, NY
Posts: 1,117
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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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03-06-2004, 11:02 PM
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Mad Scientist
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Join Date: Oct 2003
Location: Buffalo, NY
Posts: 901
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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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-- It is by will alone I set my mind in motion...
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03-09-2004, 08:52 PM
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TinyRC Pro
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Join Date: Mar 2003
Location: Australia
Posts: 63
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Coorect, thermal grease only fills the holes and improves conduction, a thick layer is a NONO.
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03-09-2004, 11:35 PM
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0reZepyT
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Join Date: Feb 2003
Location: Boston, MA
Posts: 804
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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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