I have an iphone, the screen smashed (glass Digitalizer & LCD) so i have replaced all and i now have no screen, i checked the connectors and all appear ok. 1 2 and 3, is there anyway i can test the new screen without trying it on another iphone as i dont have one to hand, i have cleaned and blew any dirt out and still have no joy the iphone itself powers and works as it connects to the pc and makes all the usual sounds i just have no screen it just stays black as if it was off. i have also done a hard reset to no avail does anyone have any tips to tricks to try? should i consider ordering another screen? thank you.!