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There are several possibilities here including the LED panel, drivers, and LED controller, and Gamma settings, tint control.
If this just occurred all of a suddenly without making any adjustments to the gamma, tint, or from a firmware upgrade, then it would narrow it down to a hardware failure.
Also if this is a true LED panel, and not an LCD panel with LED lighting (some Sony sets), and it is pink on all inputs including the Menu/OSD, then I suspect the green LED driver is faulty.
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