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The sensor behind the plastic readout window needs to be exposed to a sufficient amount of light to alter the display brightness from dark room mode to bright room mode (dimmed display, bright display). Be sure sufficient light falls on the digital readout display when desiring the display to be at its bright mode setting.
you might have a special setting on the tv. not just color setting, more like brilliant, or your case a dim mode, try different menu settings. my sony dims when no one is in the room for like 5 minutes.
You need to give a more detailed description of the problem. The LG 47LH90 is an LED backlit TV with 'local dimming' technology. This means that there are lots of white LEDs behind the screen and these can be controlled in groups to allow localised areas of the screen to be dimmed to produce better contrast between light and dark. It is very likely that when the room is dark, this local dimming is more noticeable. The actual individual LEDs cannot be controlled and so the area that is dimmed will generally be greater than the area that is required to be dark 'blooming effect'. In addition, LED backlit displays only maintain their contrast through a tight viewing angle. If you sit too farto the right or left, then light from non-dimmed LEDs will leak through and the screen will look lighter. In short, there may not be any fault with your TV.
How old is your bulb? If it's got more than 1000 hours, it may just be getting dim and needs to be replaced. I need dark curtains in my living room to view movies, you just can't watch anything in a bright room with this unit.
are you able to see the picture in a dark room ? does it appear bright enough then ? if so the lights behind your screen have dimmed or gone out completely. this may just be the power supply for the lights or your lcd panel may need to be replaced