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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Loud beep and bright blue light on display but nothing else.

I am guessing that I have issue with my display cables and have tried several combinations of the pin placement and no luck. Watch the video and let me know if you see something I don't.

I have the MK2S kit and just finished it this evening.

Quick video showing my issues

Answered! View the answer I have this problem too

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Hi Eric,

let solve this ;)

Follow these steps:

1) Please double check again all cables are connected correctly and ALL THE WAY in

2) If issue persists, turn off printer (use the switch and unplug the cable)

3) Open RAMBO cover, leave motor cables plugged, PSU plugged and unplug everything else)

4) Plug the cable with electricity, press the switch. Can you hear a noise?

5) If yes, contact support, if no proceed

6) Unplug printer, turn the switch to off

7) Plug LCD cables

8) Plug the cable with electricity, press the switch. Can you hear a noise?

9) If yes, contact support, if no proceed

10) Plug Extruder cables

11) Plug the cable with electricity, press the switch. Can you hear a noise?

12) If yes, contact support, if no proceed

.....

By this, we will be able to determine, which component is causing the issue.

Please let me know if you managed to solve this :)

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Heard a the beep at step 9 again - looks like I need to contact support - Thanks - E

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Hi Eric, it might be the LCD is broken, please contact the support.

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This is hands-down the best resource for this problem. There are other forum posts that attempt to handle this problem, but I believe most of them are just cable issues. This gives the user a bit of reassurance that the RAMBO won't frizzle if you only have subsets of the entire electrical config hooked up.

Thanks so much.

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I ended up having two of my wires in the wrong spot - it took the team at PRUSA a few views of my video to catch it, but they were able to catch my mistake. Thanks PRUSA support team!!!

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Can you let us know which wires were swapped ?

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Looking at your wiring looks like mine and I have the same issue. Can you share which wires you had to swap?

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Got mine going too. Ensure the pink stripe on the ribbons from the LCD is facing up inside the Rambo box.

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Same Problem here. What was the solution?

Update (09/22/2017)

In my case it occurs when i'm plugging the print cooling fan.

Update (09/22/2017)

The pins for fan2 (print cooling fan) are on a different position than shown in the connection guide.

The position is labeled on the rambo board. It is below the pins of fan 1.

Everything works fine now

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Hi Hartger, can you please take a picture of your RAMBo board with plugged FANs and send it to info@prusa3d.com mentioning my name? I just checked newly assembled printer and the cables are as described in the manual.

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Eric Griffith will be eternally grateful.
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