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Television won't turn on. When plugged in makes a buzzing noise

I went on vacation and when I came back my plasma TV wouldn't turn on. It makes a buzzing noise when plugged in. I took the back off and checked all the components. Nothing appeared damaged. I replaced the power supply board. The TV still would not turn on and the buzzing noise remained. The only time the buzzing stops is when I unplug the cable that connects the power supply board to the main board or when I unplug the TV entirely. There is no standby light, and I've checked the actual power cord. Any other suggestions?

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Update (09/11/2018)

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this isite the are I'm talking about. It may not be this at all. But once I unplug the cord connecting it to the power supply board, the buzzing stops. And as you can see there is another smaller orange and black cord running directly to the tvs power buttons. I was gonna order another main, but wanted some advice.

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@klclarke what model is your TV? What boards have you checked? Post some images of all of your boards with your question. That way we can see what you see. Adding images to an existing question

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Kandace Clarke  since you already replaced the power board and the buzzing comes from the main board, I would proceed with replacing it. There is no visible damage on your board

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4 Comments:

Buzzing seems to be coming from power supply but both boards (old and new) produced same sound. No visual damage or even damage by touch...no bulging at all...ok. thank you. Just wanted to know I'm not on wrong track...

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Kandace,

Did you ever get this resolved? I have a similar model and experiencing the same thing.

Thanks,

Derek

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I’m having the exact same problem w/ my t.v. Any suggestions??

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I replaced the power supply board (center) . The model is S50HW-YB07. When I unplug cord from power supply to the main which is top left in pics with all the hdmi ports, the buzzing stops. Coincidentally there is a cord running from the main board to the area where the power button is located...

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Kandace Clarke will be eternally grateful.
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