How can you tell if it broke down?

@claudioseb75012 it has long been established that the "Rice trick" does not work. It is the equivalent of doing nothing. In order to determine what is going on with your laptop, you will need to start working on it.

The very first step you want to take is to disassemble your laptop. You can start with the iFixit guides on here Dell G15-5510 Gaming but ultimately you will need a more detailed guide. Use the Dell G15 5510 Service Manual for that. You will have to remove the motherboard, the USB board, the I/O board as well as the wireless card and the RAM modules. All of those will need to be cleaned since we do not know how much liquid was spilled and where it caused the issue, so it is best to clean all of those. Remove the heatsink from the motherboard as well.

While you clean your boards, take a close look at all components and connectors to assess the damage. Look for major corrosion, evaluate the pins in the connectors etc,. Take a look at all connectors as well as cable ends. Once you got any gross contamination cleaned, use 90%+ isopropyl alcohol and clean your parts some more. For a proper cleaning, use this guide. It was written for an Apple iPhone 3G but all the steps are pertinent to your laptop as well. I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. It would of course be best to get everything ultrasonically cleaned, but if that is unavailable this will work as well

After that, reassemble your laptop and re-evaluate. Do not forget to evaluate the power adapter port (DC-in jack) and it is possible that you may need to replace the battery (that will depend on where and how much liquid leaked into your computer. If it got water damaged, then this is a must and not an option, since it may have, or will shorten out. Also, do not forget to apply new thermal paste while you reassemble your motherboard. Here is a generic guide 放熱グリスの塗布方法 for that

Once it is properly cleaned and you made sure that there are no obviously damaged components and it is reassembled, now you can begin the actual troubleshooting. You will need to start with your power supply. Make sure it has the proper voltages. Check the DC-in jack of your laptop. Make sure there is no corrosion, debris etc. that prevents it from working. Clean it of any debris etc, use a few puffs of air to clean it out. Get an ammeter and see if your laptop draws any amperage from the charger. After that, you need to check and see if your motherboard even gets power. For the proper test points etc, post some good pictures of what you see. That way we can see what you see and hopefully point the power rails on your motherboard out. iFixitでの質問に画像を追加する方法

Your motherboard could be Compal LA-K661P and here LA K661P is the schematic for that. If it is not a LA-K661P let us know what the numbers on your motherboard show.

It's all a bit tedious and it sounds like a lot, but it really is not as complex as it sounds. Main points are the cleaning and then the troubleshooting. For as long as you have not taken care of the actual water damage, you can't troubleshoot your computer. Of course, you can guess and just replace parts but that will be wasteful and can be expensive.