How to make your Raspberry Pi desktop fit on your TV screen so wallboards can be viewed correctly full screen

Open up the terminal and type:

sudo nano /boot/config.txt

• Use your keyboard arrows to scroll down to this line

# Uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border.
overscan_left=20
overscan_right=20
overscan_top=20
overscan_bottom=20

• Change the values of the overscans as described (ensure there is no # before each overscan value). From testing an LG HD TV we set the values to -65 for all overscan values. Different TV's may require different values so it will be a case of trying different values if -65 doesnot work.
• Save the edited file

Press Control-x
Press y
Press [enter]

• After exiting the editor, restart using the command

sudo reboot