回答先: The fan become quite noisy. I assume it should be replaced?I fixed mine by making rubber mount for the fan using wide rubber band cut to fit between the fan shroud & the plastic case. Also used WD40 to lubricate fan shaft. Also when unit is not in use I unplug it and bypass the unit, connecting the cable box HDMI direct to TV. Shame the unit is not provided with on/off switch & HDMI bypass.