How do you know that your galaxy s5 is water damaged?

Answer 1

Turn off your phone, take off the back and take out the battery. look in the area where the battery sits for a small square sticker. if its white there is no water damage, if the sticker is pink or red the phone has suffered water damage.

Answer 2

To check if your Galaxy S5 is water damaged, look for signs such as a red or pink sticker inside the phone, condensation under the screen, issues with charging or powering on, or strange behavior like screen flickering. Additionally, if the phone has been submerged in water, it's likely water damaged.