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Hello there in the Setup Menu, please choose the "Restore Defaults" option.I have put a picture below
Hello again I see that no other Expert has stepped in to help.When you press the menu button on the TV if it is also upside down, then the fault lies inside your TV with the TCON board.I have found the board here however please make sure that the board numbers are an exact match. When you open the back of the TV the TCON will be at the top in middle of the TV behind a metal grill cover.