Original Prusa i3 MK2S is a successor to Original Prusa i3 MK2 with small hardware tweaks for easier assembly and improved reliability.

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printer doesn't power up

After completing the installation of the kit I powered up the printer but nothing happened. When I push the button of the lcd screen I hear a beep but the screen is blank. Also the hotend fan doesn't spin.

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I have the same problem.

Afer complete all the steps of the assembly guide. I plug on and nothing appears on the LCD.


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I solved the problem. Normally in electronics the red side of a flat wire needs to be on the side of pin 0. However in de rumba mini it has to be on the side of pin 10. If you look close at the picture you can see it. I turned the cables, red away from pin zero and it came to life. Works like a charm now

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witch picture do u mean?


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Most Helpful Answer

I have this same problem, but I'm fairly sure my LCD cables are oriented correctly: red line to pin #10, or pointed "up" when the electronics box is mounted.

Things that I've checked:

  • power supply is correctly set to 110V (I'm in US)
  • power cables seem seated correctly
  • green LED in the power supply lights up
  • green LED in the electronics box lights up

Any hints or suggestions would be much appreciated.

Thanks in advance.


After 4 passes through the instructions, I realized I had LCD cables 1 and 2 swapped. The middle picture showing the two LCD cables confused me as to which one was "in the front". LCD powers up now - phew!

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Check the right orientation of LCD wire, if you do not put them correctly then nothing appear on LCD display... I do the same error on mine and was a little disappointed when powering on the beast :)

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Same Symptoms. Different problem -- a bent pin.

The first time I powered up, the the LCD didn't light up. Panic.

--Didn't see a light on PSU or on Rambo board.

---Finally did discover the green light at the top of the Rambo. The case has to be open and you have to look at the right angle to see it. Never did find a light on the PSU.

---Tech support (chat) person suggested trying all permutations of the LCD cables until I found the correct orientation [From the suggestion, sounds as though you won't destroy any components regardless of the LCD cable orientation. Many thanks to whoever designed the circuits with that foolproof feature.]

---After many cable changes I finally noticed that one pin at the top end of one of the Rambo connectors was bent outward slightly. Because the Rambo case is so cramped, I didn't notice that the LCD cable was not seating all the way down. Gently straightened that pin by pushing it with the screwdriver (thanks Rambo for using connector pins that don't just snap off).

Powered up and the LCD now displays the "calibrate" message.

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Bon Thomassen will be eternally grateful.
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