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If your TV has already fully adjusted in brightness set up?, and there will be no good picture results?...try to adjust the "SCREEN-Screw" at the flyback slowly. If the picture still dark'?. the picture tube has need to rejuvenate.
The tv LED light on the tv front bazel frame face have the word "LAMP" light up or blinking?Yes.The tv projection lamp been inside this tv like 1 1/2 or 2 years already,tv used it everydays like 4 or 5 hrs daily?Yes.Than the tv projection lamp life are over,that why it dim picture tv now must have it tv projection lamp to be replaced.
How many years is your TV now? Usually TV has its life span, there comes a time that it happens. And need to look for a technicians, cause some of theme can still be repair by adjusting the brightness inside your TV.