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LCD Backlight test
1. In the system Menu, enter “SelftTest”, and press “LCD backlight”.
2. Turn on or turn off the LCD backlight as displayed on the screen.
3. Exit the LCD backlight test by pressing the "ESC" key.
LCD test
1. In the system Menu, enter “SelftTest”, and press “LCD”.
2. The system will automatically conduct a screen display test, which can check the bright or dark spots on the screen.
3. Press the "ENT" key to exit the test.
