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Turn the calculator on, press and hold the 2nd button, then press the up-arrow button to increase the contrast or the down-arrow button to decrease the contrast. If you go too far, release both buttons, press and hold the 2nd button, and press the appropriate arrow button.
I think your keys still work, but you need to adjust your contrast. To adjust the contrast by lightening the screen, press and release the "2nd" button and hold the down arrow. Reply back if this doesn't work. Hope this solution helps!
Adjust the contrast. Turn on the calculator. Press and release the 2ND key. Press and hold the down-arrow key for five seconds or so. If you go too far, press and release the 2ND key, then press and hold the up-arrow key until the screen is as you like it.
Hello, You can adjust the contrast on the screen of your TI86 by following the procedure below.
Adjusting the Contrast 1 Press and release the yellow [2nd] key. 2 Press and hold UpArrow or DownArrow (above or below the half-shaded circle). ¨ To darken the screen contrast, press and hold UpArrow. ¨ To lighten the screen contrast, press and hold DownArrow.