I am setting up my mpcnc right now and I just plugged in my lcd screen for the first time and this is what it looks like? I’m assuming it isn’t supposed to have dead streak across it.
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Dang.
Sometimes it can be an easy fix. Try to squeeze that little black frame a little tighter to the PCB on either side to see if that fixes it (zebra cables), if it does just bend the little tabs in underneath a bit to keep it in better contact.
Tried just about everything (without getting destructive) and have had no luck. Maybe bad from the manufacturer or damaged in shipping?
If you got it from me DM or email me your order info and I will get you a replacement.