Screen not working after installing replacement

I tried to replace my cracked screen and it seemed to work at first. The home button wasn't working whatsoever, but I don't think that's relevant to the bigger problem. After an hour or so the screen just stopped working. I was getting no output and I'm pretty sure it wasn't registering touch either. I took it to a professional and he said it looked like messed up backlight caps. What I got from that was that the display may as well be dead, and until I get the caps fixed it would remain so. However, the other day I picked it up randomly, pressed the power button and got the dead screen that prompts you to connect to a charger. I can get output like this consistently when the phone is dead. After a few minutes on the charger, I tried to get some output from the screen. Seemingly randomly, the lock screen will show for a split second. Basically I was wondering if this implies that the screen (or caps, whatever it may be) may not be shot, and the repair could be much more simple than having to completely replace a certain part? Also, I was reading a similar question and one of the answers said something about replacing the screen without the battery unplugged can cause some sort of mishap that sounded similar to my problem. But yeah, I didn't unplug the battery during the repair if that matters.