crwdns2933423:0crwdne2933423:0
crwdns2918538:0crwdne2918538:0

crwdns2934241:0crwdne2934241:0 jessabethany

crwdns2934249:0crwdne2934249:0:

You have two phones here since the motherboard *IS* the phone.

Phone 1: uncleaned water damage.  "cleaned the motherboard as best I could with 91% alcohol on the display connections."  That is pretty much the same as doing nothing.  Think of corrosion like a cancer, it will continue to spread until it is removed.  There are parts all along the motherboard that have some role in the generation of the display.  Corrosion on any one of a number of components will cause an issue like you describe.

Phone 2:  From the description of the problem, I would guess that this board had water damage as well.  Also possible it that you are putting a working motherboard into a frame with a water damaged LCD.

Solution: Replace LCD.  If problem still exists, pursue board-level water damage restoration.

crwdns2915684:0crwdne2915684:0:

open