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Humming Noise from Humax PVR 9300?

Have a Humax PVR 93oo and have noticed a humming noise (it is not the machine fan) it sometimes increases in volume when different scenes or ads come on - it is on all channels can sometimes be on a channel one day and not the next - it is like an interference hum but can still be heard when the volume is on mute -this has been worse since the Freeview upgrade
Mrs Miles, October 2009
You have an earth loop in your system - connecting a ground lead between tv and PVR might improve things.

John, February 2010
link Click here to see other fixes for Humax.