OK here's my standard spiel about spills:
"Whenever a liquid spill occurs the first thing that has to happen is the laptop should be shut down immediately. All power must be removed as soon as possible. It is especially important that the battery be disconnected and removed.
All affected parts must be removed from the laptop.
No attempt should be made to start/restart the computer since this could potentially damage the logic board beyond all repair.
Then all affected parts would be washed in deionized water and blown dry with compressed air. (In a water spill the deionized water is probably not as critical. Depends on the mineral content of the water.).
This is especially true of the large chips on the logic board. Liquid can wick under them and cause havoc for weeks if not months after the incident.
The logic board should be placed in a drying/dehumidifing oven for at least two days. Longer depending on the spill.
The keyboard is a separate matter."
" everything works fine, except for the screen."
Worst case scenario; the graphics chip is dead = new logic board.
It will help us to know the exact model, size, year built.