Question about Texas Instruments TI-89 Calculator
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?
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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