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Message: <blockquote data-quote="Llew" data-source="post: 989659" data-attributes="member: 175007">Brought the faulty card out of the holding bay for another poke around. The nature of the fault - LNB voltage drops out after about 20 seconds scanning muxes - suggested a temperature breakdown of a component.I was ready to replace the more easily removable IC's and diodes in the shutdown circuitry beginning with the MOSFET just before the resettable fuse - and in fact the MOSFET was indeed the culprit.I think perhaps the gate switch-on voltage needed was changing as the temperature of the MOSFET rose. The switch-on grounds the fuse and its resistance rise removes the 12V to the card.A replacement has indeed cured the fault. I can now use it in my other PC <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png"  class="smilie" loading="lazy" alt=":)" title="Smile    :)" data-shortname=":)" /></blockquote>