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Blown Mosfet CDX20A
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<blockquote data-quote="thylantyr" data-source="post: 1976481" data-attributes="member: 560358"><p>Make sure the transistors are insulated from the heatsink chassis using</p><p></p><p>the mica insulator. Apply thermal joint compound on both sides of the mica,</p><p></p><p>some on the metal transistor tab, thin coat only. You can also use the fancy CPU</p><p></p><p>goo called Arctic Silver.</p><p></p><p>You can use this mica stuff, cut the material with scissors.</p><p></p><p><a href="http://www.mcmaster.com" target="_blank">http://www.mcmaster.com</a></p><p></p><p>part # 85955K21</p><p></p><p>This is 4 mil thick, they make thicker. But I don't think it's a good</p><p></p><p>idea if it's too thick. You can probably use the 8 mil stuff too if</p><p></p><p>this one is too thin and breaks during clamping.</p><p></p><p>After transistor install, use a DMM to verify there is no shorting of the metal</p><p></p><p>transistor tab to aluminum chassis.</p></blockquote><p></p>
[QUOTE="thylantyr, post: 1976481, member: 560358"] Make sure the transistors are insulated from the heatsink chassis using the mica insulator. Apply thermal joint compound on both sides of the mica, some on the metal transistor tab, thin coat only. You can also use the fancy CPU goo called Arctic Silver. You can use this mica stuff, cut the material with scissors. [URL="http://www.mcmaster.com"]http://www.mcmaster.com[/URL] part # 85955K21 This is 4 mil thick, they make thicker. But I don't think it's a good idea if it's too thick. You can probably use the 8 mil stuff too if this one is too thin and breaks during clamping. After transistor install, use a DMM to verify there is no shorting of the metal transistor tab to aluminum chassis. [/QUOTE]
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