If the TV unit that you have is a DLP than a bulb in the rear is the likely culprit and is burning out. The bulbs lasts for thousands of hours but over that period the light output reduces.
The procedure for replacing is relatively simple. Use good safety procedures including disconnecting the power cord. My suggestion is you purchase a very good quality replacement bulb installed into the module. You want the brightest bulb to get the best results,
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yes the UN39FH5000F is an LED version of Samsung. I'am not aware of any user maintenance procedures for increasing the brightness. These TV's with the LED should run for years and maintain their brightness. Suggest consulting a repair center to determine if the repair cost would be reasonable.
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