Knob on LCD fails selecting menu item

Hello

I have just completed my Prusa Kit i3 MK2, switched it on and LCD indicates calibration (as expected). When I try to turn the knob, nothing happens, I can see the menu. Pressing the knob is working, but not the turning, therefore it is useless.

Could you please suggest a solution.

i.e.

maybe firmware update?

faulty knob?

I double checked wiring, all good, LCD works perfectly.

Thank you for your help.

Andras

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In the meantime I have updated firmware and unfortunately there is no change. Still faulty knob. Need your help. Thank you.

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Chosen Solution

Customer support has given me the solution:

1.turn off the machine and disconnect all cables between Rambo and LCD

2.stretch well all the cables

3.Reconnect again and turn on machine

To be honest, I never expected this to work but it DID!

Huge thank you for them.

Problem solved.

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Andras Farkas will be eternally grateful.