I came across an old PC keyboard with a built in calculator (Focus
Is it likely that the chambers with the liquid crystal stuff leaked or broke down over the years.
It's likely that the zebra strip connecting the display to the circuit board has gotten dirty or displaced, take it apart and clean it with warm soapy water, careful not to stretch it out.
It doesn't have one. It is one of those flat ribbon cables that seems to be permanently fixed to the display and soldered to the board.
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