Check the following:
- If Light sensor is set to On, the brightness of the TV screen changes to match the ambient brightness.
How to access Light sensor settings:
- Press the ACTION MENU button on the remote.
- Select Picture.
- Select Light sensor.
NOTE: Light sensor is located around the center of the bottom part of the TV screen.
- If an image is displayed on the TV screen with which screen image retention may easily occur, the function that gradually reduces the screen brightness operates in order to protect the TV from screen image retention. If you change the screen or perform another action that eliminates the risk of image retention occurring, the brightness returns to normal.
NOTE: With screens such as the HOME screen and the app’s top screen that contain many bright still images, this function will especially frequently operate.