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Tries unplug the tv for an hour,replug it back in.Go to tv Menu,go to PICTURE,go down to resetting.The tv Tuner board should resetting it back to Factorry setting.All the HDMI setting should work now.Not,than than the Tuner board is dead.Tries websites like Shopjimmy.com Ebay.com to buy a refurbish Tuner board for the replacement.
If it is a buzzing noise, it is the Ballast for the lamp.
If it is more of a grinding sound, it is the Color Wheel motor.
Does it go away when you turn off the tv? If so, does it stop abruptly or does the sound tend to get softer (winding down noise)
If the noise stops abruptly it is probably the Ballast.
If the noise takes several seconds and seems to get softer until it stops about 30 sec later then it is the color wheel motor.
Have you tried adjusting the contrast? , have a similar problem with a 42'' lcd and it appears to be related to the contrast setting .If is set my contrast below 90% the buzzing sound stops.
This buzzing sound seems to be a common problem with LG TV's