LED TV Causing hum

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FranZAR

FranZAR

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I am picking up hum through my speakers as soon as I switch on the TV. It is connected via HDMI from AVR. I have tried all three sources, being Explora, HD PVR and Mede8er and same result. With TV off and audio only, no hum but as soon as I switch it on the hum starts. Optoma projector on HDMI 2 out and TV off, no hum, so conclusion is it is not the source. Whit brighter scenes it is more prevalent. I have swopped HDMI cables and power plugs to no avail. This has definitely only became noticeable after Explora was installed.

Any ideas or suggestions will be appreciated.
 
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