Question about Texas Instruments TI-85 Calculator

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Won't power up, flat line across screen - battery problem?

My screen just powers up to a horizontal line. Does the smaller backup battery need replacing? Is something else wrong? Thank you.

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Re: Won't power up, flat line across screen - battery...

Yes, this sounds like you'll need to replace your back-up batteries. That will probably resolve the problem.

Posted on Aug 27, 2007

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Ti-84 shows horizontal lines

Could be old age. Could be a corrupted OS. Could be the aftermath of a rogue 3rd-party game program. In any event you should reset the RAM if you can see your way around the screen,
Try installing the latest OS and see if there is any improvement in the display.

Dec 11, 2013 | Calculators

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My screen has a horizontal line across the screen

Make the calculator perform a self test: Part of the test is the display of some line patterns. You will be able to see if something is wrong with the screen.

TO PERFORM A SELF TEST (No I am not shouting, but I cannot use Bold fonts nor underlined)
  1. Turn calculator ON
  2. Press and HOLD the ON key
  3. Press the "E" key , the key with an E to its right
  4. Release the ON key
  5. Tests will be performed cyclically until you execute a SYSTEM HALT
  1. Press and HOLD the ON key
  2. Press the and release the "C" key key with a "C" to its right.
  3. Release the ON key
  4. You should see the empty stack.
If you need to repair it, google FixThatCalc.
Good luck.

Jan 23, 2010 | HP 48gx Calculator

1 Answer

Won t turn on- NOT the 4 AAA batteries. Could the backup battery affect the main power??

To answer the question you asked. No the backup battery does not affect the main batteries. It is there to keep the memory electrically refreshed when calculator is turned off. You will know that the backup is depleted or almost depleted if the screen displays RAM CLEARED, everytime you turn the calculator ON.

Now to the calculator not turning ON. IF THERE ARE NO HARWARE PROBLEMs with your calculator (of this I cannot judge for I am no prophet) , it may be that the screen is too light and you cannot see what it displays. If that is the case, you can darken it as follows.
1. Press [2nd] key and release it.
2. Press [ArrowUp] key and release it.
3. Repeat Steps 1 and 2 in sequence, until screen darkins enough. You may have to repeat the sequence several times.

Hope it helps.

Oct 11, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

One horizontal line across the screen

Read this article for troubleshooting.
Hope it helps.

Oct 07, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Random screen

I'd try reinstalling. Can you connect to the computer and use ti connective software. You can download everything from the ti web site. need more help to step you through it email me at:

Aug 09, 2008 | Texas Instruments TI-83 Plus Calculator

4 Answers

Texas instruments ti-86 screen problem

The TI-86 uses a very small, very thin ribbon cable to connect the display board to the LCD. The cable is about 2.5 " wide and about 4" long, and is only slightly thicker than a piece of paper but has about 40+ leads buried inside. Over time the leads will break at the folds (there are at least two folds in this cable to fit it down inside the case). There is no cheap solution to fix this problem. You might have some "Mr. Fix-it" try to fix it, but he will tell you to throw it away after he renders it completely inoperable. The calculator uses two Torx bit screws at the bottom of the case (T-6 size) so you will have to get the correct screwdriver to open the case. Save your money, sanity and time and use it till you can't stand the missing lines and throw it out. Even the data cable looks like it is glued down so if it lifts off after being cooked or frozen a couple of dozen times in the back of your car you can't fix this.

Mar 28, 2008 | Texas Instruments TI-86 Calculator

2 Answers

Horizontal lines obstructing the second half of the ti 83 calculator screen, anyone know repair tips?

I had the same prob with vertical lines on the screen, and getting messed up when there was lots of numbers on the screen.

Solution: Change your batteries. Put some freshies in then adjust your contrast until you see the little black box. If you still have a problem with the lines, darken the screen until it's black (2nd up repeatedly) and let it sit for a couple minutes. Lighten your screen back to normal (2nd down) and turn off then turn her back on.

Jan 17, 2007 | Texas Instruments TI-83 Plus Calculator

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