Samsung Galaxy Smartphone: Water damaged phone: How fix:
Hello.. the procedure:
Electricity and water do not mix. If continue to use water short circuits chips inside making your phone's motherboard burn out = phone as a paperweight
1. Do not try to use your phone. Power it off. Immediately, if able to: remove the battery back door and take out the battery.
If you turned the phone on after getting wet, you probably shorted something out.. If you never turned it off and kept using it thinking it is fine.. but time passes and the phone continues to act up.. you are probably killing your phone as the water continues to damage the motherboard. Once you turn off the phone, consider the phone dead, because trying to turn it back on with spark energy to the motherboard frying it in the process. (I've seen that happen several times)
(if for example, you have a s6 family/note 5 whereas the phone where the battery does not come out without breaking the glue seal to take it out, leave it in. just power off the device.)
2. dry it off with a towel, shake out any loose water droplets inside the phone
3. use a hair dryer on low setting to try to dry out the phone... no hair dryer? set your phone out in the sun, but don't bake it.. (what you are trying to do dry up any water that might be inside)
4. get a empty container that's bigger/taller than your phone by at least 1/2 inch on either side, fill it with rice and submerge your battery-less and battery backdoor-less phone for 24-72 hours.
(the rice will dry out your phone. this takes time. water is usually trapped underneath the chips on the motherboard where you would not be able to get to dry off unless you un-solder the chips)
5. If you phone doesn't turn on after that.. it means that the water has either fried the chips on your phone and/or corrosion from water that is undried in the phone has effectively made it useless. You can't send it back to Samsung to fix, because it is your fault. Water damaged phones will cost anywhere up to $300 to fix. Consider all data on the phone lost. Time to buy a new phone.
If the phone turns on but something doesn't work, it means you shorted that part of the phone out.. Don't bother sending it to Samsung to fix because it was your fault. Take it to your local cell phone repair shop to fix. Ask them for a quote or at least get a diagnostic inspection to see what might be fixable. Explain it was water damaged upfront. Assess the damage costs to decide if you want to repair it or not
If the screen is black and you get a constant flashing red light that won't stop.. that indicates to service technician that your device is water damaged. Don't try to trick servicing shops about fault, there are water indicators in your phone that tells them it was your fault. Best to man up and tell the truth before you waste your time and money.