crwdns2934241:0crwdne2934241:0 Doc Brown

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Why is picture gradually geting darker

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The picture on my Samsung TV   Model - HL-S5687W  is slowly getting darker. My contrast control is maxed out. Do I need a new tube?  Where would I get one?

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Samsung HL56A650C1FXZA 56-inch DLP TV

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open