check whether there is a crack on the surface of the man-machine interface, timely replacement. In addition, it is necessary to check whether there is dirt on the surface of the man-machine interface. 
hmi display module  https://www.stoneitech.com/
        
    
 check whether there is a crack on the surface of the man-machine interface, timely replacement. In addition, it is necessary to check whether there is dirt on the surface of the man-machine interface. 
hmi display module  https://www.stoneitech.com/