If you cannot have them working 24/7, then you can keep the LED screen in stand-by mode at night time. With this, the screen will actually be alive, but will not display any image. From the outside, you cannot predict the difference between a turned-off screen and a stand-by screen, but this makes a huge difference from inside. In stand-by mode, its components are still alive and produce some heat.
There is one more solution to get the screen in working condition. Try to heat up the cabinets with some electrical heaters and let it warm up for 30 minutes to an hour before you turn on the screen again.
There is one more solution to get the screen in working condition. Try to heat up the cabinets with some electrical heaters and let it warm up for 30 minutes to an hour before you turn on the screen again.
