Unfortunately, there is a good chance that the tv is permanently damaged beyond repair. When water gets into the LCD panel (the screen) it can short out the electrical contacts, and the screen is something that is not possible to fix, doing so would cost 3 times as much as the tv is worth.
Unplug power to the tv, and leave it off.
Ideally, you'd seal the tv up inside a large airtight container with descciant crystals or rice (raw, uncooked white rice) and leave it there for 2 days to absorb the internal moisture.
If you can't do that, put it in a well ventilated room and point a fan at it and leave it there for a few days.
Plug back in, and check for functionality. If it still doesn't work, that would confirm internal damage. While it may be possible to fix, if it is just a damaged board, even that isn't worth the cost as you'd pay at minimum about $250 for a simple board swap, and hundreds more if it is the panel. You could buy a brand new tv for under $200, with a fresh warranty, which would make more sense than repairs. I can recommend replacements if you'd like.
Best regards, ***** ***** for the news,