hello, if there are only (2) lights on on the control board after power on the printer , then the control board is defective.
but sorry, we do not have V3.0 and V3.1 board anymore . not sure if V4.0 board can be compatible or not , need change control board ,heatbed, extension board , screen , lcd cable and all the cables on control board into V4.0 version .
but even change these items, still can not confirm it can work normally or not. not sure if there is any other difference will cause uncompatibility,like basement structure.
if you would like to try change these items see if will work,pls email to sales@geeetech.com to order these parts.
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