Phone vibrates but absolutely no power to screen
My Nokia Lumia 635 will not show any kind of light on the screen, but I know it is not the battery because it will vibrate every 15 seconds. I have had problems with this phone and have used the windows recovery tool on it once before as well as replacing a broken LCD and having water damage. (The water damage was nearly a year ago and it seemed to have fully recovered.) The phone stopped working while I was at work after using it to listen to music the whole way there. Unlike the time I had to use the recovery tool, the screen will not light up even slightly or show the Nokia logo, but the rest seems the same but does not overheat like it did before. (It doesn't smell like the circuit board is burnt anywhere)
What I have already tried:
-charging for about 30min
-volume down and power
-power for 10 sec
-plug into computer (would detect for about 15 sec then forget then re-discover ect.)
-hold volume down then plug in
-disconnect and reconnect LCD (to see if it was loose AND in the boot-up loop again)
-Is it possible for software problems to interfere with the screen's ability to light up?
-Is it possible for water damage to cause problems after the phone is dry and functional?