Before Installation Note 1.Test before installation -When testing, do not remove any protective film or tags. Please pay attention to the problem of static electricity. -Before attempting any repair, be sure to ground yourself is an ESD (electro static discharge) strap. This will prevent static electricity from damaging the electronic components within the phone. -Ensure you wear eye protection and use caution not to cut your finger with the glass splinters. 2.Simulates testing -Screen replacement is very fragile product. We strongly suggest test before installation. Please simulates testing, which means mobile phone apart, (motherboard + battery + LCD or screen) connected audio cable and new replacement, power on, test finished. If test OK, please install it. If it cant show, please contact us at the very first time. And please dont force it to be installed in mobile phone. Well not be responsible if the mobile phone is damaged during installation. 3.Do not over-bend cable -Please make sure LCD cable is not over-bend. Over 90 degrees bent will cause black display.