Where is the Brightness (Black Level) setting? Reduce that. And then start again.
Please be advised that some manufactuerer's Advanced Settings stuff takes control of the Backlight Level, disregarding where you set it. Like Dynamic Contrast Ratio as one example.
Brightness Level (Black Level)
Contrast Level (White Level)
The Brightness Level and Contrast Level has no effect on longevity and does not hurt the set. The Backlight Level, generally you hope that you dont have that full blast, so as to save life on the lamps. Over the life of the unit, (were talking decades) you will have to keep turning up the Backlight Level to keep a constant lumen output as the bulb wears itself out.
Vizio VP322 Plasma / Vizio GV42LF LCD / Denon 2200 Silicon Image DVD / Panasonic S97 Faroudja Genesis DVD / Oppo 970HD Mediatek DVD / Oppo 983H Anchor Bay DVD / Panasonic LX-600 Laserdisc / Aiwa MX100 Multi-region VCR / JVC S7600 S-VHS / PS2 / Sega Genesis / Nintendo SNES / Roku 2 XS & HD-XR / Realistic STA-90 Reciever / Realistic Minimus 7 / Antennacraft G1483 Hoverman / Belden 7915A RG6 / Channel Master 7777 Titan 2 UHF/VHF / Panasonic AX-200u / Optoma Graywolf 92" / Draper Luma 92"