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Emerson TV not turning on

Hello I have a Emerson LC401EM2F 40" TV that is currently not turning on. The TV wouldn't turn on a couple of days ago. I would press the power button, and it would act like it was going to turn on, but the screen would stay pitch black. I was told that it was the digital main board that went out. I bought a used digital main board on ebay, switched it out with the old one and it still didn't work. When I ran a flashlight through the screen while "on" and I saw a dark grayish rectangular frame towards the middle and in the center its a dark rectangle. When I turn the Tv off the dark grayish rectangle disappears. Any ideas what it could be ?

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