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Originally Posted by rowan194
I don't think the cover would make much difference, the majority of the heat would still transfer via the bottom of the transistor to the metal underneath it (at least it looks like metal)
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It could be a lack of heat sink compound ( that white stuff under the transisitor when you removed it). The picture shows the transistor mounted to a heatsink so it would need the compound to work efficiently. If all this werte in place, the plastic cover should be fine. JMHO.
cheers