Question about Texas Instruments TI-89 Calculator

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My calculator was in my backpack during a huge rainstorm and now wont turn on

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  • kakima May 11, 2010

    Remove the batteries if you haven't already done so. Let it air dry thoroughly.

    Once dry, put the batteries back in and try to turn it on. If it does, fine.

    If it doesn't, then try a hard reset. Press and hold down the 2ND, left-arrow, and right-arrow keys, then press and release the ON key.

    Good luck, and let us know how it goes.



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Electronic devices do not like water.
Most important: remove batteries quickly to avoid electrochemical reactions. Corrosion may kill your device permanently.

If you know how to disassemble your device (and put it together again later), do so. Rinse everything with distilled / deionized water. Dirt, salt, sugar, organic residue from coffee or cola all may be harmful. Since it was a rainstorm only, this may not be so serious, but rain water is not exactly clean, too. Do not alcohol or other solvents.

Gently towel away all water using soft tissue. Cotton wool tips as used for cosmetic also may prove helpful. Let the parts dry in a dust free environment for one or two days. A blow dryer can speed up the process but be careful with the temperature setting. Neither glass nor plastic like to get hot.

Re-assemble the calculator and put back the batteries (you also wiped and dried them, yes?). If you're really lucky, the calc works again.

If you do not dare to disassemble the device, keep it in a dry and warm (not hot!) place for a week before putting in the batteries again and hope for the best.

Posted on Feb 09, 2010


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