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Samsung LED Un55hu8700fxza lost the picture image, but still has sound and the backlight with blue screen. What should I troubleshoot?

My 3yr old Samsung LED Un55hu8700fxza lost the picture image, but still has sound and the backlight with blue screen . I've changed the T-Con board but nothing changed. Can you help with isolating the problem; I can't imagine this is a new problem with Samsung after find this issue all over the web. What else can I do on my own? Thanks, Bill

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