For Re-Tuning, missing channels and picture break-up issues please see the ‘Television Tuning’ section here - http://hs-techsupport-samsung.blogspot.com/p/television-tuning.html
Picture Settings - 'A' Series
You can select the type of picture which best corresponds to your viewing requirements.
1. Press the Menu button to display the menu.
2. Press the Enter button, to select "Picture".. Press the Enter button again, to select "Mode"
3. Press the ▲ or ▼ button to select the desired picture effect. Press the Enter button
Press the Exit button to exit.
Your set has several settings which allow you to control picture quality.
1. To select the desired picture effect, follow the "Changing the Picture Standard" instructions above.
2. Press the ▲ or ▼ button to select a particular item. Press the Enter button.
3. Press the ◄ or ► button to decrease or increase the value of a particular item. Press the Enter button.
Press the Exit button to exit.
♦ backlight: Adjusts the screen brightness by adjusting the LCD backlight brightness. (0~10)
♦ Contrast: Adjusts the lightness and darkness between objects and the background.
♦ brightness: Adjusts the brightness of the whole screen.
♦ Sharpness: Adjusts the outline of objects to either sharpen them or make them more dull.
♦ Colour: Adjusts the colours, making them lighter or darker.
♦ Tint: Adjusts the colour of objects, making them more red or green for a more natural look.