Question about Texas Instruments TI-89 Calculator

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TI-89 menus (f1,f2,f3,etc.) a couple words are unreadable

The menus in home's f1 for example "open" is dotted and unreadable, they look like chopped up words

Does anyone have a solution for this?

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Part of the display control has failed disabling sections of the display. You might check with TI to see if they have a fair repair price, this is not likely to be one you can solve.
The only possibility would be to disassemble the case to gain access to the display. If TI doesn't repair them at a fair cost, you might try to remove the LCD display from its mounting or, if it seems practical, to stress the display from the side. The contacting of an LCD is done with a silicone rubber strip with embedded fine wires that carry the control signals from the printed circuit board to lightly plated corresponding contacts on the glass of the LCD. The positioning of this strip is extremely critical and is dependent on precise pressure on the silicone strip. Yours may have 'slipped' but the error could be cause by poor positioning at the factory that has just now revealed itself. The difference between contact and no contact at the junction of the strip and plated glass area could be a couple thousandths of an inch. You may make it worse instead of better but if it is unreadable anyhow, it really doesn't matter.   

Posted on Feb 02, 2009

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The fact that the icons show on first screen is not a bug. It is a configuration setting.

Just in case some keys answer to a keypress.
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If that does not work (because the arrow keys) do not answer, try to RESET the calculator: Press [2nd][MEM] to open memory management then press F1 key to RESET. Try ressetting all RAM.
If more keys refuse to respond then maybe you should contact TI-cares at

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Press [ALPHA][F1 or F2] to activate the [SHADES] tab. This open up the following screen.

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If you press the [ALPHA][F5] keys you have the HELP ? screen below.

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I assume you know how to enter data in your calculator. The keystrokes in the following pertain to TI92/92Plus/ Voyage 200 PLT. The main differences with the TI89/Ti89 Titanium is that the function keys F6,F7,F8 are not accessed directly but by the key sequences [2nd][F1], [2nd][F2], and [2nd][F3] respectively

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Give it a name: here testing.


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When you finish press F2.PlotSetUp.

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As you can see I cheated: a perfect parabola. R^2 =1.


And here the best fit represented on same graph as the statistical data


Usually you have to try different regression models, until you find the one that fits best the experimental data.

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