On certain menus, the words are pixelated and scrambled. You can't read them or even select them.
SOURCE: TI-89 menus (f1,f2,f3,etc.) a couple words are unreadable
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.
SOURCE: Texas Instruments TI-89 calculator/unreadable pixelated words
If to much memory is being used up the calculator will behave like that. Sometimes if you download programs (mainly ASM) that didn't work with your hardware version (mainly 2) you can get this types of problems. I would be willing to work with you more on this by email if you like.
[email protected]
Plus I can download instructions that will help you operate your calculator that can be overlooked in the manual or any datadump.
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