6 
2 Why is the backlight on but the screen isn't showing color?
I just disassembled and assembled a Sony Xperia T2 Ultra D5316 after I dropped it and broke the digitizer. I let it charge for an hour after the repair, and when I turned it on, the screen's backlight lit up but no colors are showing. The phone has been laying disassembled for around 6-7 months. I tried putting another screen in it before this but got the same result. When I use the unlock gesture to enter my password, I get feedback from the vibration motor, telling me that the digitizer is working and I am able to interact with the phone without any color from the display. If everything was working I would be seeing the numbers and hearing the accompanying vibration when I tap them. But I can't see the numbers or anything for that matter. So I need some suggestions on what I should try to do in order to troubleshoot or if I should describe my problem in an easier way.
crwdns2934109:0crwdne2934109:0
2 
crwdns2944067:05crwdne2944067:0
Check the LCD flex cable. This cable appears to be very fragile since the first screen went faulty due to unknown reasons. The second one still works but there is a slight rip in the LCD cable, luckily the display still works but I used super glue in the slight rip in the flex cable to stop it from ripping more.
crwdns2934271:0crwdnd2934271:0 Ben crwdne2934271:0
Alright. Do you mean the LCD cable connecting the display to the motherboard (also connecting the volume, power, and camera buttons) or the cable coming directly off of the display?
crwdns2934271:0crwdnd2934271:0 Indian Bill crwdne2934271:0
Cable coming directly off the display, there are two spots that can cut very easily. The motherboard cable is OK right? because I ended up replacing the phone for a customer when I ripped the motherboard cable.
crwdns2934271:0crwdnd2934271:0 Ben crwdne2934271:0
I think the motherboard cable is OK because the screen responded "normally" after I put it back in. I still think it's the motherboard cable issue because I don't believe I damaged the LCD cable (let's call it that). But I may have ripped the motherboard cable when I tried to take out that cable. When I tried to pry it off right where the LCD cable plugs in, I gave it a pretty good tug and may have done some damage. I don't know for sure.
crwdns2934271:0crwdnd2934271:0 Indian Bill crwdne2934271:0
Well if it is motherboard cable. You are probably out of luck. I couldn't find anyone that could connect the motherboard cable to the logic board.
crwdns2934271:0crwdnd2934271:0 Ben crwdne2934271:0