If you're experiencing incorrect colors and your LG Smart TV displays a blue filter, there are a few potential solutions to consider:

1. Reset Color Settings: It's possible that your TV's color settings have been inadvertently adjusted. To address this issue, follow these steps: a. Access the TV settings menu. b. Select the "Picture" option. c. Locate the "Color" settings and reset them to their default values.
2. Backlight Issues: The presence of a persistent blue filter may also be linked to problems with the TV's backlight. If the backlight is failing, it can affect the colors and overall display quality. In such cases, you may encounter issues like lines on the screen, double images, or a complete absence of an image, indicating potential backlight or screen problems.To address backlight issues: a. Consider replacing the backlight components if they are malfunctioning. b. If you're experiencing additional screen problems beyond the blue filter, such as lines, double images, or a lack of image, it may be necessary to assess the overall screen condition.

Please note that if these steps do not resolve the blue screen issue on your LG Smart TV, it's advisable to consult the TV's user manual or contact ATR customer support for further assistance or to schedule a professional inspection and repair if necessary.