Notice Before Installation (Profesional technician is needed for installation ) ,We strongly suggest test the item received before installation, pls don't remove protective film or tags when testing. Test steps are: clean the flex cable of screen and the slot of the motherboard before test , connect new screen to the motherboard tightly,make sure battery was charged fully, and pls also make sure your motherboard is not broken , Power on ,d finished ; if test ok ,pls install it carefully , if it can't work ,pls contact us at the very first time , and pls don't force it to be installed in mobile phone ,we can't be responsible for the damage due to wrong installation. Return maybe waste time, pls confirm your model and the item type you are purchasing. Thank you for your attention !