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typically this is an issue with solder joints being a little cracked or compromised in the interconnects-- either the board-to-board connector on the right of the unit (most typical i’ve seen) or the OLED connector itself. note that each connector has two failure points, for each side of the connector. these “brown out” OLED issues i’ve seen two or three times in the past and have to do with the 3.3v connections being a little weak.

do you have a soldering iron? it’s pretty quick to reheat the joints, but it’s a moderate adventure to disassemble the aleph.