Sign up at any technical school in your city, where there is a course of mobile phone maintenance, which takes about one year to study, and the tuition fee ranges from 800 to 2000. It depends on the consumption level of each city. Or go to some professional after-sales departments to learn from teachers. If it is local to Pingdingshan, it will be easy. Please contact this QQ and leave me a message. I specialize in after-sales maintenance of mobile phones. I can teach you to repair your mobile phone.