How to enter Samsung 171S LCD factory pattern?

Boot mode, the OSD menu, the brightness and contrast values will be adjusted to 0,
and then enter the OSD menu "Information" page, hold down the "SOURCE" button and hold for 5 seconds, the screen will appear "SERVICE FUNCTION" Menu 1 , first in the OSD menu, the brightness and contrast values will be adjusted to 0
2, and then enter the OSD menu of information items, hold down the "SOURCE" button and hold for 5 seconds, you can enter the factory mode of the