LCD screen not working
The LCD screen is vital for operating the printer. Should you encounter any kind of trouble, such as a dead screen, corrupted text or other issues, please refer to the guide below.
First of all, unscrew the LCD screen from the printer frame, remove both M3x10 screw holding it the LCD board in the plastic casing, and remove it from the casing. See if the problem still appears when the LCD is not pressed by the casing.
Blank LCD screen
This problem usually appears only on user-assembled printers. If your printer's LCD screen remains blank or displays corrupted symbols after you turn on the printer, there is a chance it is caused by incorrect wiring. Follow these steps to fix the issue.
- Turn the printer off, remove the power cord and unplug the printer's USB cable from PC
- Open the cover of the electronics board.
- Double-check that all cables are properly seated and they are not visibly damaged. Depending on the model of your printer, please refer to the following guides for information on how to make sure the cables are properly connected: MK3 (and MK3S) EINSY miniRAMBo electronics wiring and MK2/S (also MK2.5 and MK2.5S) miniRAMBo electronics wiring.
- Make sure that the LCD ribbon cables are not warped at any spot and that they are fully seated in the correct connector with the correct orientation.
- If you suspect that the LCD ribbon cables connectors are not firmly seated in the slots, disconnect the LCD ribbon cables and check the slots for any bent pins. If there are bent pins, you can use tweezers to fix them. However, be very careful not to break the pin(s) completely.
- Gently push the connectors back into their respective slots. Then reconnect the power cord and turn the printer on again.
- If none of the above resolved the problem, turn the printer off again and try to unplug both of the cables, lay them down on a flat surface and gently stretch them. Then plug them back in and turn on the printer.
Squares on the LCD screen
Firmware updates are necessary to keep your printer up to date. However, installation of an incorrect firmware can lead to letter corruption on the LCD screen. There's an easy fix, though:
- Go to the prusa3d.com/drivers/ and download the correct firmware version for your printer setup.
- Once you download the correct zip file, simply follow the Firmware upgrade and flashing instructions and you are good to go.