1. Check the cable of the TV: the white screen may be caused by loose cable or poor connection. You can check all the lines of the TV to make sure they are connected tightly.

2. Restart the TV: Sometimes there is something wrong with the TV, and it can be solved by restarting it. You can try turning off the TV, unplugging it and turning it on later.

3. Adjust the screen brightness: If the TV brightness is too high, a white screen will also appear. You can try adjusting the screen brightness in the TV menu.

4. Check the warranty period of the TV: If the above methods have not solved the problem, it may be that there is something wrong inside the TV. You can check whether the warranty period of the TV set is still valid, and if so, you can contact the after-sales service.

In short, in the case of a white screen, you can check the connection cable first and adjust the brightness of the screen. If you still can't solve the problem, you can consider restarting the TV or contacting after-sales service.