Minda door machine does not display the room number.

System failure. In this case, first check whether the LCD screen is powered on and whether some power supplies are plugged in. Does the LCD display "No signal" (if the LCD is normal, it may be due to poor data cable connection, loose memory or motherboard failure; If it is not displayed, it may be that the LCD screen is not powered on (the power cord is damaged or the hardware is damaged) and the power supply problem is eliminated, which are all caused by system failure. In this case, you can report the maintenance to the property management.