I have a 41CX (Fullnut) I brought back from the dead, but it has one remaining curious problem. It does not display any alpha characters properly, infact it doesn't seem to display an non-numeric characters properly. This pretty much makes the calc unusable. To elaborate, pressing '-' displays '-' on every digit, likewise for "+", "/" and "*". Press any function key, "XEQ" say, and the screen is full of very stange characters, but the three digits where "XEQ" would be displayed are different. I know this is not a logic board problem, as I have tried two boards, nor a logic board to keyboard connector problem, as I have tried several of these. It may just be case pressure, as the screw posts are cracked, but seem to hold OK, so I am suspecting the display drivers. Any one else seen this one ?. Thanks - John.
HP41 Strange Behaviour
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