Printer does not turn on (BCN3D Sigma)

no puedo acceder a la carpeta shares pero allí hay buenas fotos de la sesion1 que podéis utilizar para este artículo. Ponedle a las imágenes circulos con color #0096ff, parecidos a la primera imagen y lo publicáis.



Allen key 2mm
Allen key 1.5mm
Phillips screwdriver

Make sure that the display does not show a “drive not mounted” message. If it does, the issue may be on the LCD’s microSD card, you can find how to solve this issue on this article:

How to update the micro SD files on your LCD (BCN3D Sigma)

If the LCD is completely black, connect the printer to the computer through the USB port to see if it turns on, if it does not turn on the issue may be on the LCD itself.


1. To disassemble the LCD screen turn off the Sigma and unplug the printer's power cable.

sigma-turn-off-1 sigma-turn-off-2


2. Remove the central and the left side covers, depending on the version the screws might be in different positions. screw-iconx6 M3 8mm

screw-iconx2 M3.2 9.5mm



3: Depending on the motor installed you will need the 1.5mm Allen key to unscrew the motor.

If you have the version R19 or the upgrade with the bondtech motors, disconnect the filament sensor and pull down the lower Bowden:

_MG_2333 _MG_2332


4. Check if the mainboard turns on. To do so, raise the bed and remove the printer’s
central cover. If it doesn’t, check that the power supply cable connector is properly
connected to the mainboard.



5. Check the cable connections on the On/Off switch are properly connected

conector Cropped conector-cable Cropped


6. Check that the power entry module cables are properly connected.



7. Check that the power supply cables are properly connected.




Make sure that all the screws are properly tightened and that the cables do not disconnect when lightly pulling from them.

Forum community

Repair didn’t go as planned? Check out our forum community for troubleshooting help.

It's important to keep your printer in good shape to make the most out of it. In this chart, you can find a list of the extruder maintenance procedures and how frequently these should be done. Maintenance Plan


bcn3d-recycle  Take your e-waste to a certified recycler. Check how we do it in BCN3D.



  Buy these parts
  Power Supply

SKU 10877



check flat cable eng check mainboard fuse eng


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