First, the touch function is completely normal, and the LCD display is completely normal. To meet these two preconditions, only when the mirror surface of the external screen is broken can you choose to replace the external screen separately, and the price is above 600. However, the requirements for replacing the external screen are relatively high, and professional equipment technology and high-demand dust-free workshop are needed to replace the perfect screen. Of course, there are professional workmanship and technology, otherwise it will be no use.
Second, the touch or LCD display is abnormal. For example, the screen does not display, and the inner screen is cracked, broken and discolored. Wait, something unusual happened. In this case, you must directly replace the entire screen assembly. No matter whether your external screen is intact or not, as long as it is abnormal, it will be declared scrapped. It can only be replaced with an integrated component of internal and external screens, which costs 1000+ yuan.