It's a Sony brand TV, I assumes, and posts this solution. To make it to its factory reset data values, you have to enter its service mode. If you wish to get more details about, how to enter service mode to Sony TVs, and how to adjust the data values, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up previous posts there, either by type in the model name to your set in its search box, or view it in Mosaic /Timeslide option.
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