Some TV screens are prone to screen burn in when a stationary image is displayed over a long period of time. To prevent this, the Wii has a Screen Burn in Reduction feature that fades the screen when your game is paused for more than 5 minutes.
1. From the Main Menu, select the Wii button at the lower-right corner of the screen to access the Wii Options.
2. Select Wii Settings.
3. Select Screen.
4. Select Screen Burn-in Reduction.
5. Select On or Off to enable or disable Screen Burn-in Reduction. Click the Confirm button.