Flight Feeder Screen

I have had my flight feeder for about a year now. I have it mounted on the tower in waterproof box. It has been working great, but I have a question; is they anyway I can turn the screen completely off to keep any non needed heat build up inside my box. it is not must heat when it goes to screen blank but over time it does amount to a little. Running solar power makes a difference of my total power requirements to run 24/7. Any suggestion different than taking the screen out of the box.
Gary

Unfortunately the screen backlight cannot be turned off.