not working light for LСD, board Ramps-FD

I want to use the display backlight to turn on the light in the chamber of the printer, put the parameter memory

but after turning on the printer light does not turn on, try to turn the menu is switched on for 1 second and immediately OFF??


  • Make sure nothing else is using fan 2 pin like heaters or having second fan enabled.
  • Is there any way to control (switch on/off) case lights from reperiter host during print? 
  • send
    M355 S1
    to enable and 
    M355 S0
    to disable it.
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