What kind of white? Huawei's tablet and mobile phone have light sensing function. With the automatic change of light intensity, too bright places will cause the screen to turn white. For example, in the sun, the screen will be very white. On the contrary, it will be brighter at night, of course, it is not particularly bright, and the tablet will automatically adjust an adaptive brightness to protect the user's vision. If it's all white, it's recommended to restart it to see the effect, otherwise it will have to be tested at the maintenance point.