[Lucien Nunes]

I don't think there's enough stored EHT energy to ignite anything, it must already have reached a critical temperature while the set was on, but not enough material was burning at that point to notice. It's possible that switching the set off, therefore reducing convection currents past certain hot components, changed the airflow speed and direction around the smouldering material in such a way as to accelerate the combustion. I think Gerry Wells made this point, possibly while discussing GEC convergence panels, as a possible cause of things getting worse after switch-off.