Question
I have a rainbird stp 600i and the sprinkler system is working, but the LCD screen is blank so I can't see the time, days or make adjustment. I unplugged it and plug it back in but the screen is still blank.
What do you think is the problem?

Answer
Hey Brian, if the controller is working, but you have no display, then the LCD screen is no good. It is not worth repairing, so Install a new controller. I suggest either a "Irri-trol" Rain dial controller, or if you like Rainbird, use one of their ESP series controllers. Good luck and have a great day.