There is likely a static charge (voltage / difference of potential) between the the receiver and the TV.
They should have their grounds tied together. This should be covered in your owner's manuals.
In some cases, there may also be a stray voltage on the cable line's ground. If grounding the two together doesn't work, you may want to call the cable company (or you or a friend may be able) to check the cable line for a stray voltage or bad ground.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
YOUR GONNA WANT TO LOSE THE COAX,&USE THE HDMI PORTS ON BOTH,YES,I KNOW THE CABLE IS'NT CHEAP, BUT IT WILL BE WELL WORTH IT.
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Thanks for the help. However, it is not possible to take audio off the HDMI connection at the receiver. Video and audio are switched only by the receiver and then go straight through to the TV. If I want suuround sound from the TV (e.g. free to air broadcasts) then I have to use the coax connection back to the receiver from trhe TV.
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