It is a common problem to see vertical lines on mobile phone screen. There is no doubt that it is a quite annoying matter happening on phones. So, finding some way to solve it is necessary. Since everyone’s causes maybe different completely, the flowing are some possible causes and solutions. 1. The connectors are in bad connection. Firstly, check the connection between the flex cables and the logic board carefully. If the connectors are covered with full dust, you should clear them with the help of alcohol and a brush. Surely, if connectors are damaged by physical movements to be bent, possibly you need to replace them as fast as you can. Do remember that, don’t try to force the connectors together rudely. 2. The IC on the display is damaged. If the above way can’t help you solve the matter, it is time for you to check the IC on the display, especially the top left and right corners. If there is any damage, you phone parts maybe defective, so you have to replace a new one. By the way, give you a warn, the screen has to be replaced if the IC was broken. If you can’t check the problem well of replace phone parts perfectly, do ask the help of professional people.