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I'd like to report a bug, hoping that there will be a new firmware update soon fixing this issue.
The TV set (LG 49ub850v) has an option to set the HDMI color space in the picure options menu, It is named "black level" here. It can be set to LOW, HIGH, or AUTO.
I'm using the TV with a computer via hdmi cable, and it sends full range RGB, wich means that "black level" on the TV must be set to HIGH.
The problem:
In the case of certain refresh rates, the TV always falls back to LOW black level (limited color space), even though the picutre menu reports that it's set to HIGH.
So I switch to 3840 x 2160 @ 30hz or 24hz, and the picture is displayed in low black level, but in the picutre menu it seems like it's set to HIGH. Then I change the setting to LOW, and the image does not change. After this I set it back to HIGH, and now the image is disaplyed correctly. However, I have to do this procedure every time I turn on the TV or change to this resolution. In 1080p 60hz, this bug doesn't happen.
I have a the latest firmware updated through the net on the tv and check it regulary.
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