In the face of the water ingress of the display screen, what is needed is the word “as soon as possible”. Use the shortest effective method to deal with it. The longer the time is, the greater the loss will be, so when you encounter problems such as water in the warehouse, you must act immediately. When the water enters the warehouse, it may be necessary for the air box to enter the water. All air boxes should be exposed to prevent the water from evaporating into the LED display screen MRV300 after the box is filled.
Please read the originial post here: https://ledscreenpartsus.wordpress.com/2020/02/18/body-water-solution-for-your-led-display-screen/