Wait wait wait
You said you put too much liquid. What kind of liquid did you use? If you don't have a small Philips-head (+ shaped) screwdriver you will never be able to properly unscrew those screws. Don't try to open the console using the wrong bit, you can end up damaging the screws to the point where you won't be able to open them with any tools.
Follow [guide|25399|this guide] '''closely''' to get to the motherboard and make sure it's dry. You can also buy the tools you need on that page.