Question about Texas Instruments TI-85 Calculator

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I have not used my TI-85 in 8 years. Inow it will not turn on. I put in fresh batteries. I stored it without batteries in it.

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TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

Posted on Nov 09, 2010

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I have a TI-83 graphing calculator and it keeps reporting 'Low Battery'. We replaced the 4 AAA batteries with a fresh set and got the same message. The calculator is less than 2 yrs old. Do I need to...


There can be two causes to this problem. One, the batteries that you put in may be expired. Some batteries have expiration dates on them (i.e. Duracell). If the year on it has expired or is coming near to expiring, you may have to put newer batteries in there that are longer lasting in years. Even if the expiration year is far-off, you still may need to put newer batteries in the bay. Two, your hypothesis of changing the lithium battery are correct. I read in the manual that you should change it every 3 or 4 years. The lithium battery is the back-up battery and it is like a memory card for you calculator. Whenever you put a new fresh set of batteries in the bay, the lithium battery saves your information while you are inserting the batteries in the bay. When you turn on the calculator again, it saves your functions that you've had in there. Hope this clears up your confusion! Reply back if you are still seeing the message.

Jan 15, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

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


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.

Dec 28, 2010 | 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
to set your contrast. Good Luck, Calculator should show the screen calculations now, so you can tell if it is on or not.............Not that it wasn't working, you just couldn't see it working or coming on......

Apr 10, 2009 | Texas Instruments TI-85 Calculator

1 Answer

My TI-85 will not come on


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
Key), then UP arrow, More UP arrow if desired contrast is needed more. You should see the
display or screen effectively. It is not that it would not turn on, it was just that you couldn't
see the display, it was set too low for observation............................It was on just couldn't see it.......

Mar 26, 2009 | Texas Instruments TI-85 Calculator

1 Answer

TI-92: Power loss while not in use.


Hello,
You may be right. I have left batteries in my TI92 for years without using it. When I put in fresh batteries, it came back to life. The backup battery of my TI92 (bought a dozain years ago) has not been changed yet.

Hope it helps.

Dec 04, 2008 | Texas Instruments TI-92 Plus Calculator

4 Answers

Calculator won't power up.


That is perfectly normal, almost all of TIs graphics calculators have it.

Nov 29, 2007 | Texas Instruments TI-85 Calculator

3 Answers

No image display on screen


heres a good one: BUY A NEW ONE!!!!!!
(i dunno)

Oct 16, 2007 | Texas Instruments TI-85 Calculator

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