Question about Texas Instruments TI-85 Calculator

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Ti 85 wont turn on, batts good, tried to adj contrast , still nothing

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Are you sure the batteries are in correctly? They alternate negative/positive, positive/ negative and so on. The first time I put the batteries in, I didn't have them in correctly. You tried adjusting the contrast. Just try adjusting upwards. Sometimes it takes a little for The Ti 85 to come on or adjust right. The Ti85 is an old calculator and, may not work any more. I had my Ti89 for almost 20 years so, they are pretty reliable. If nothing has worked take out all the batteries including the small one in the back. Texas Instruments say's " leave them out for 5 to 10 minutes." I had to leave mine out for over a 1/2 day to get it to work.

Here is the battery reset procedure for the Ti 85.

Try a new set of AAA batteries.

  1. Adjust the contrast by pressing and releasing the [2nd] key followed by pressing and releasing
    the up arrow; repeat as necessary. To adjust or lighten the display, use the down arrow.
  2. Remove one of the AAA batteries. Press and hold the [ON] key for 20 seconds. Reinsert the
    AAA battery and then turn the calculator on.
  3. Remove all of the batteries including the round lithium battery for 5 minutes. After the 5 minute

  4. period, reinsert all of the batteries and turn the calculator on. Adjust the contrast if necessary.

Just keep trying. Sometimes they can be a pain.

Posted on Dec 28, 2010

  • charles williams
    charles williams Dec 29, 2010

    This is a older procedure that may help your calculator.
    Press and hold the 2nd, left-arrow and, right-arrow keys, then press and release the ON key.
    Try this procedure possibly before and, after the battery reset procedure.

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1 Answer

How do I fix the contrast on a ti 85 Calculator


Turn the calculator on. Press and release the 2ND key. Press and hold the up-arrow key to increase or the down-arrow key to decrease the contrast.

Jul 01, 2010 | Texas Instruments TI-85 Calculator

1 Answer

I have replaced the batteries (AAA & Lithium) and when I turn the power on I get the solid block cursor, but nothing I type shows up. It is almost like it is frozen. I have had this for about 16 years...


Hey I had at 85 years back when everyone else had an 83. This problem doesn't seem like its dead or forozen. It seems like a contrast problem. I hope for your sake that it is.
Try turning it on; getting the dark screen, and then press second and down. I can't remember on the 85 if you press second and down and then hold down; or press sencond and down back and forth repeatidly. Try both and good Luck!!

Jun 14, 2010 | Texas Instruments TI-85 Calculator

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How do you set the contrast on the TI-85? My


turn the TI-85 on and then hit the yellow "2nd" button and then down arrow. This may take several repeats. If it gets too light hit "2nd" and Up arrow.

May 12, 2010 | Texas Instruments TI-85 Calculator

1 Answer

Screen is mainly blank except for one faint line. Have put new batts in and checked for any dampness on inside, every thing looks good. Still nothing on screen.


It is possible that the screen contrast is too light.
To adjust the screen contrast follow the procedure:
  1. Press [2nd] key and release it.
  2. Press and Hold the UpArrow key to darken or DownArrow to lighten. Keep pressing until contrast is adequate.



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You can increase the contrast by pressing and releasing the 2ND key, then pressing and holding the UP key. To decrease the contrast, use the DOWN key.

Oct 21, 2009 | Texas Instruments TI-85 Calculator

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It's not a color screen so no, you can't change the color. You can, however, change the contrast. Press and release the 2ND key, then press and hold the up-arrow to increase or down-arrow to decrease the contrast.

Sep 23, 2009 | Texas Instruments TI-85 Calculator

1 Answer

TI 85 doesn,t turn on. I didn't use the calculator for a year. Please help !


Assuming good batteries, both AAA and the Memory CR 1616, then most often a screen contrast problem. Push ON, Then 2nd button (yellow Key) , then UP arrow, then either UP or Down arrow
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Screen contrast problem. When the calculator lost power the contrast was reset to zero.
If new batteries, both AAA and Memory battery CR 1616, then press ON, then 2nd (yellow
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heres a good one: BUY A NEW ONE!!!!!!
(i dunno)

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