Samsung On5 Stuck on Powered by android and model screen after water

Ok so after cleaning the motherboard with isopropyl alcohol, the phone charges and the screen comes on but when I try to power it on, it says samsung on5 and powered by android but it is stuck at that screen for no matter how long I wait. I can’t get into recovery but I can get into download mode so I flashed a stock rom and it was successful but when it powered back on, it is back to the original stuck on the model screen and powered by android.