Turn off LCD screen
Can the LCD screen be turned off during a print?
Re: Turn off LCD screen
Can the LCD screen be turned off during a print?
No, but you can print a cover for it: https://www.thingiverse.com/thing:2783213
Re: Turn off LCD screen
Most 20x4 Displays (like the Generic RepRapDiscount one Prusa uses) have two Display control pins, one for setting the Contrast, and one for turning Backlight on and off.
Both of these can be software controlled, but in the RepRap Display the connections are hard wired and cannot be software controlled.
Backlight is always on and hardwired to the supply voltage, and the contrast is hardwired to the variable resistor on the back.
Seems the original RepRapDiscount guy have cut corners here, since Marlin itself did not support dimming or contrast setting. (i don't know if Marlin or Repetier support this now, other Firmwares do)
Re: Turn off LCD screen
The backlight of the LCD is directly corrected to VCC through a resistor labeled as "RLED" on the PCB. What you could do is desolder this resistor and replace it with wires, so you can connect another resistor together with a switch in series so you can turn the backlight on and off. The value of the resistor should be 1K according to the schematic of the RepRapDiscount Smart Controller, but you could also use something a bit larger to limit the current that goes to the backlight even more if you'd prefer your LCD to be less bright.