I have the same problem> Only lasts for a few minutes, but, it hurts a little and its an incredible annoyance. Besides being annoying I'm afraid the tv is dying soon and the noise its its high pitched scream of pain agony as it slowly finds its way to its final resing place.t
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The hum may be a b ad regulator in the stove. Pull stove out and see if regulator is humming. It's where the gas line connects to stove.
Maybe the power was interupted to the stove which may have reset power to control board.
Disconnect the input and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
Yep, same problem with mine. After many trial fixes, I discovered that it's the HDMI connection. I tried two different new HDMI cables in two of HDMI ports on the TV, but still got intermittent sound. The only way I solved it was going to component cables (RGB) with a separate audio cable. Works great now. Other Web sites say that HDMI connections do not always electronically "handshake" well between devices. Not sure how this HDMI problem can be permanently fixed, but using the component connection works fine.
Check the menus to make sure the audio is not turned off. If that is OK and you have the means, try using other inputs. If it works on some inputs and not on others, that would imply a system control problem, which is unusual for that model.