its the digitizer flex cable, disconnect it and re connect it....... to test, remover digitizer flex cable and only install lcd flex cable......Lines should go away...

to test, try screen without connecting the digitizer flex cable...... Usually if digitizer flex cable is not installed properly u g will get white vertical lines...... If u disconnect digitizer cable and power up screen and no lines....then u know its digitizer flex cable not installed properly ...disconnect and re connect....