Black display after changing battery 1st gen iPad with WiFi
Hello. I'm working on a 1st gen iPad w/ WiFi for a friend and after changing the battery the display is black. The backlight is lighting up fine but there is no display graphics active. The device is recognized in iTunes and can be placed in and out of recovery mode. I have backed the device up in iTunes while I had it plugged in the last time. As I was working on it I hot checked it a few times (connected everything up and turned it on without fully closing it up) and it came to life every time and all functions worked as expected (WiFi connected, light sensor detected low light, digitizer responded, charging functions worked, headphone jack and external speakers made sound, etc) Now after replacing all of the broken retention clips around the bottom of the screen along with using super glue to reattach all of the rubber bumpers that came loose during disassembly, the display is not working correctly. Luckily I performed one last hot check before snapping it closed and noticed it then. Can someone please tell me what could be causing this to happen and what I can do to determine how to repair it? It was working perfectly up until this point and I just want the project done so I can give it back to him. I don't have any other iPad parts to help troubleshoot what is going on so I'm stuck there.
Things that I have tried to get this going again:
-cursed at my bad luck and wished the problem away
-removed power from logic board/ disconnected battery for a few minutes
-power cycling the device
-cleaned and dried the LCD cable contacts with 91% IPA
-removed the clips/ screws from the back of the LCD and reconnected to test
-placed in recovery mode but didn't go as far as restoring the device (didn't have a backup made at that point)
Is this a good question?