Just replaced the display assembly and now getting a black screen

Just replaced my display assembly and now getting a black screen. I've tried resetting the phone, turning it off by sliding where the power off slide button would be and tried plugging it into ITunes to restore and nothing. The restore option is asking for the password which I should have taken off before I did the repair but didn't. When docked with my speaker it plays music so I know it's not the battery. I have taken it's a part several times and checked the cable from the displaceably to the board in a does not appear to be damaged. Looking for any help anyone can provide.