Because the touch film has been damaged and turned into atomization. Only removing it will make the display work properly. If there are no other problems with the monitor itself. After removing the Touch, the display screen should return to normal.

If you want to try to repair it yourself, don't consider the touch and waterproof functions:

1. Remove the 10 screws on the back of the aluminum bezel. (See attached “green part”)
   
   
   
   
2. When you separate it, there will be an electronic cable stuck, you can cut it off directly. 
3. After remove the aluminum bezel, you can see that it and the Touch are glued together. You can break the Touch and remove the remaining glass. (Please protect yourself carefully)
4. Then lock the aluminum bezel back~

For customers' harsh usage environments, we still recommend changing future orders to PCAP Touch, like these models :

https://www.itechlcd.com/DataSheet/YJ/YPM1500PHB2WT-PCAP.pdf

https://www.itechlcd.com/DataSheet/YJ/YPM1500IPHBWT-G1.pdf