I have a Xbox one s that turns on and immediately turn back off after the charm. A water bottle was poured into the vents on top of the Xbox without my knowledge while I was gone. When I came back I turned it on and it turned on and chimes then turns back off.
There’s probably a good amount of liquid damage on the board. Might be just some shorted mosfets but could also be the APU or Southbridge both can cause this type of problem. Only way to know if it’s fixable is to take it apart and have a look.
You’ll likely need to replace the power supply too those things are far from even water resistant in fact they are a frickin sieve you could use their casing when making a cake there are that many holes in it