crwdns2934241:0crwdne2934241:0 TheLastMillennial

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If a column of keys stops working that typically means it's a hardware problem. You might have success taking the calculator apart and cleaning the button side of the circuit board with isopropyl alcohol.

However, it's likely you'd also need to do a board level repair using soldering equipment. Water damage and corrosion can certainly cause issues like this.

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