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Re: Humming noise from tv
If you have a cable 'box' and its plug is not polarized, flip it over to see if that affects anything.
Such line frequency 'hum' can come from several sources but a common one is called a 'ground loop' and can be caused by having chassis grounds not connected to each other.
It can also come from a failed or failing capacitor in a device external to the TV which can allow poor filtering in a power supply and audio problems.
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If you can handle it then check the 12VDC supply filtration. I mean to say that you have to confirm that the 12VDC is coming with stability and no noise inside it. The filtration work is being performed by the capacitors in the circuitry. Check the capacitor condition in main board please. If it is plague (bad capacitor) then try by replacing it. The sound can be mainly heard through speakers and it most probably caused by sound processing area presents in main board. This kind of thing can be eliminated by changing the main board.
try unplugging any equipment that you have attached to the tv one at a time, such as dvd players, surround sound, cable box, etc. also if you have a cable box attached, try adjusting the volume on it. if you have everything unplugged from tv and it still hums, then it may be a tv issue
My 37 inch vizio did the same thing. go to your menu screen on the tv and go sound. My tv has an option to turn speakers on/off. Once I turned my speakers off and the back on again everything worked great. hope I helped! if I did please let me know! youtube.com/xniax1
Try removing all cables going to the TV except the power cord. Power on the TV and press mute. If you have any unwanted noise, then you have a defective TV and since it is new, you should get an exchange. If there is no noise with the A/V cables removed, then you might have hooked the source (cable box/DVD Player) into the wrong inputs of the TV.
Unfortunately it looks like the power supply has failed, since the unit is new I would check into the return policy of the store you bought it from, if your lucky you can just exchange it. If not it will have to be shipped back to the manufacturer.which can be a hassle, you may have to pay the shipping to the repair facility.
Let me know how it goes and please rate this solution.
I need to know how you have your TV hooked up through the cable for ex. hdmi or the green blue red white and yellow cables that plug into the back if its not doing it through the ps3 or anything else means its not the TV its either a faulty cable box or the wires are bad or hooked up wrong going to the tv.. i would first check make sure all the colors are in the right color slots if thats how you have it hooked up and if thats all right then just email me back through the fixya website i am on every hr id be happy to further help you, and if you can please give me a rating it would be greatly appreciated...
The TV usually hums when the backlight setting is too low. So turning
it up should get rid of the problem. To do this please follow these
1. Turn the TV on.
2. Press the Menu button on the remote, located right below the channel changing button.
3. Press the down direction button, located at the middle of the remote. Press that button until the backlight is highlighted.
4. Press the right direction button until the backlight is at 100.
5. Press the OK button and then the Exit button until you get back to your picture.