First, restore the phone to the factory settings to determine whether the problem is caused by a system fault. If the problem still exists after the factory settings are restored, it should be the backlight module of the screen, or the flat cable connecting the screen and the motherboard, or the LCD layer of the screen. This is a hardware problem, and you can't solve it yourself, It can only be sent to the official after-sales service for inspection and maintenance ZOL Q&A is the most professional IT problem solving platform in China at present, and hundreds of authoritative expert editing teams will answer all your IT questions online. ZOL Q&A is a solution platform that provides notebook Q&A, mobile Q&A, photography Q&A, hardware Q&A, digital Q&A and other IT problems. Welcome to Zhongguancun Online ZOL Q&A for more IT problems. In addition, you can also follow ZOL Q&A's WeChat public account: zol_wenda, or search for ZOL Q&A on Weibo, or follow ZOL Q&A's headline number and Wukong Q&A number today, We will give detailed answers to your questions at the first time.