I dont think it would be either Bad caps or main board IMO. Not knowing the Model # and actual pictures with the back off, its hard to let you know what actual part is the failure one. Since its an LCD TV its most likely your T-con board, that would be the one that sends the picture to the Panel screen. Or it could possibly be your panel screen. The thing I would do is try changing your T-con board first since its the cheaper of the two.
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