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You should definitely return it. It is most likely due to backlight malfunction and or backlight invereter malfunction. Either ways you should return it and demand for a replacement if its under warranty.
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It sounds that the back-light CCFL lamp is faulty. It is time to replace it. When replacing, do it to all CCFLs, because, the life time to these lams are expiring now, as the set is nearly 4 years old. Check this link http://electronicshelponline.blogspot.com/ to get more details about how to replace the CCFLs. Pull up older posts there. Some among it have details.
Used the tv original remote go into tv Menu goto PICTURE turn on more Backlight like +5 and like Contrast +30.The tv back ground should be alot brighter.
It can be the auto-contrast is doing its jobs so LG can claim that the TV has really high contrast ratio, also try turning off auto brightness feature off. It gets real bad when the scene has dark back ground such as the dark sky with stars, the TV will really dim down to give real black sky but at the same time you can barely see the stars on the screen, LG is not the only one with this design problem, VIZIO and other has the same problem as well. If you Google your model and search for review you may see that you are not the only one with this problem.
What is the exact model of this TV.
Please let me know what you find.
I have the same TV with the same problem. I'm getting tired of hitting it.
I have been told more than once that if you usa a "Visio" LCD TV in a hot area, such as near a window that gets a lot of sun, they will ****-out. Very sensitive to heat is what I have been told.
I would like to know what to do other than chucking the POS in the trash and buying a new LG.
when it goes dark can you pull up tv menu if not or ch number take a flash light and press menu on side of tv or remote and shine light on the screen, look really close and if can see any images such as letters or number then very possible have a defective lcd panel
I w having this same issue when watching a Blu-Ray disc. I found it to be dependent upon what picture mode the TV was set to. By this I mean certain picture modes would cause the TV to dim during dark scenes of a movie. Changing the picture mode helped a lot.
I would check and see if you have the text option on under your closed captioning. With the new digital transition the signal for text captioning has been getting messed up during broadcast here lately. If it is on i would just shut it off or go to regular closed captioning.
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