MacBook Pro display not working, no backlight. what to do? please help

Hi, well my girlfriend spilled water on her macbook in her bag and i told her not to try to turn it on. after a few days i tried it and it would power up as soon as i would connect the charger. Everything seems to be fine but there is no display on the screen. i could see a display with a torch but the backlight doesn't turn on. Also the power button and some keyboard buttons don't work and i hear a beep wen i press some of them.

i opened it up and cleaned almost everything with 99.8% isopropyl alcohol. i also soaked the logic board for a bit more than an hour and then cleaned it with a toothbrush. there wasnt much corrosion on it in the first place but it looks almost new after the cleaning. i then put it back together and the same problems are occuring. is there anyway to find out if there is a problem with the logic board or if the screen is damaged? i could replace the keyboard if it doesnt work but i cant seem to figure out what happened to the screen.

Any help or suggestions would be greatly appreciated