Lastly, we will need to connect the 12864 LCD board using the included ribbon cable as well as our additional ribbon cable. We will be using the EXP1 and EXP2 pin blocks on the Maestro board to connect to EXP1 and EXP2 connector ports on the back of the Ender 3 12864 display PCB.
If you are using two 10-way ribbon cables you will have to reverse the plastic shell of EXP1 and EXP2 on the LCD by pulling them off gently but firmly with a pair of pliers, rotating 180 degrees and then reinserting them on the pins. This will keep the pins aligned properly as the ribbon cable connectors are keyed.
Alternatively, you can use the ribbon cable that came with the Ender 3 for EXP2 and use jumper wires with Dupont connectors to connect directly to the needed pins. See this forum thread for more information on this method. https://forum.duet3d.com/topic/7609/conf...
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