After assembly only rectangles in LCD

I assembled the MMU step by step with the online manual.

After finishing is startet the MK2s and there are only rectangles in the LCD Menu, nothing happens.

When I Power off the printer, the Prusa Sign appears shortly and "saving files" and it turned off. Nothing more.

I tried to update firmware, but there is an time out error in the software.

What can i do?

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2 Answers

Hi Julian,

was the LCD working before the upgrade to MMU?

I suggest to check the wires, it might be some connector is loose.

Regarding the timeout, I suppose you are on Windows, try step 5:

Upgrading the firmware v1.4

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If it's a i2C LCD, there will be a little potentiometer (blue with a screw) It control contrast of the LCD. Try to unscrew it while the LCD is powered, This settings change between LCD i think ...

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Julian Stigler will be eternally grateful.
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