Topic: Nintendo Switch Black Screen on Handheld

My Sister's Nintendo Switch doesn't show any image on handheld, the touchscreen works right, and everything else but the LCD works as they should do and can be played docked.
The problem started when my sister accidentally dropped some water on the Switch (she also give it some soft hits to get the water out), she told me it didn't get into the ventilation but I oppened it anyways the next day, when I openned it, the Switch seemed to not have any trace of water, rust or burnt inside but the LCD didn't show any image, at first I tought it might need a replacement, but today I replaced it and still not showing any image, my limited knowledge doesn't know what else could be, so I hope someone can help me
Also I need to point out I already tried the hard reset and drain the battery then recharge it without docking and I forgot to say that the background Blacklight works right, the only problem is the LCD not showing image, even I checked the pins and they looked normal, I don't know what else to do, I can't bring it to any place to fix it because quarantine, hope you can help me people, please