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You can try this, from the rear with the back removed locate (hard to miss) the three large round black lens, they are on top of the three picture tubes the set uses and are your light source, if you can reach them clean them with a lens cloth or a paper towel with glass cleaner sprayed on the towel.
over time they get dusty and the picture will get dull and dimmer.
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1st sep go to menu,setting,picture and go brightness colloms rediuse the dim full line if not may be your screen is damage you can by new L E D tv.this old L C D tv panel is too much cost
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