I have same the same model. If I turn off the "Power Saver" feature (Menu--ECO--Backlight), my backlight stayed on.
During normal TV/movie viewing, when the screen turns black, such as during a scene transition, the backlight of the TV turns off. I understand this is so that the viewer sees true black. However, I find this feature to be extremely distracting and compromises my viewing experience.
Is there any way to turn off this feature?