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In the Nvidia control panel, under "Adjust desktop color settings", select the TV, scroll down, and check the setting for "Digital vibrance". If it is a 0%, set it to 50% and your color will return.
Right click on your desktop and select "NVIDIA Control Panel". Then select "Adjust desktop color settings" on the left (below "Display"). There you'll see all connected monitors. Just select the right one and click on "Restore Default" in the upper right corner.