Question about Texas Instruments TI-85 Calculator

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Characters & menus display incorrectly

Entires and results in the main screen show up with missing pixels, while the menu bar(s) at the bottom of the screen have additional pixels. i just noticed that the missing pixels blink when the cursor is in the far right column.

i originally thought this was a low battery issue, but new batteries didn't solve the problem.

thanks for any help!
My TI-85 after twelve years (!) will not light up its screen, even after replacing the proper lithium back-up battery and the proper fresh AA batteries. Could it be my metal contacts inside the battery chamber are a little rusty? Would that make that much of a difference as far as not functioning electrically?

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When changing screens/quitting menus. ... The fileselector display

Posted on Jan 10, 2009

  • mohammed marika thambi
    mohammed marika thambi Jan 10, 2009

    Please keep it clean and make sure the quality is considerably high:
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Tere are problems with your´s calculator display you need to take apart screws and carefull apart display, and then clean with isopropilic alcohol, arm display again and probe befor cover them, it´s ok close the cover if not repeat till the problem was solved 

Posted on Jan 10, 2009

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My groundbreaking TI-81 developed the same symptoms when I purchased it in 1990 for $250.
I dropped mine, and a line was totally out and the pixels had jumped like yours.
I called TI, and they said the integrated circuitboard had to be replaced. Since everything resides on the main board, your only option is to send it to them for repair, or buy a new one.
They should be up to the TI-1000 by now!! LOL

Posted on Jan 10, 2009

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  • 199 Answers

If the screen is pressed od if the device is fall down some where this happens.

Posted on Jan 10, 2009

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Use a paperclip (tiny hole on back of caculator) and reset.

Posted on Jan 10, 2009

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2 Answers

My ti-85 has missing pixels in the screen. What do I do?


Take it in for new screen,to be fitted,or by a new TV.

Jul 19, 2014 | Texas Instruments TI-85 Calculator

2 Answers

There's a blank bar that runs horizontal in the middle of my TI-84 plus that's about 16 pixels wide(high?). It's the same color as when the device is turned off. I've tried a memory reset and no results....


SPLIT SCREEN.

It sounds as if you might have split screen mode on. I've got a TI-83 as well as a TI-89 Titanium, both offer a split screen mode. The latter allows for choosing which applications are displayed on each half screen. I am presuming that you may have accidentally put your TI-84 in this mode.

So, if it is a split screen deal then all you have to do is go to the mode screen, find the option for switching from split screen to full screen, and switch it back to full.

I hope that helps. Give us your results!

Adios

Mar 11, 2011 | Texas Instruments TI-84 Plus Silver...

1 Answer

How do get the determinant from a 4 x 4 matrix


To create the matrix (in case you do not know.)

  1. Press [2nd][X^-1] to access the (MATRIX) menus.
  2. Use the right arrow key to move to the tab [EDIT]
  3. Under tab EDIT, press 1 to name the matrix as [A]
  4. A matrix template opens (default dimensions are 1x1)
  5. Change the dimensions to 4x4: Press digit 4 key and ENTER. Cursor move to 2nd dimension. Type in 4 and press [ENTER] to validate.
  6. The matrix template changes: screen shows a matrix, filled with 0.
  7. Enter the value of each coefficient and press [ENTER]. The cursor move to next coefficient.
  8. After you validate all values, press [2nd][MODE] to (QUIT) the matrix editor.
To calculate the determinant of a matrix that is already defined.
  1. In main calculator screen press [2nd][X^-1] to open the (MATRIX) functions.
  2. Use the right arrow once to highlight the [MATH] menu.
  3. Select [1:det(] and press [ENTER]
  4. The command det( echoes on main screen.
  5. Press [2nd][X^-1] to opent the (Matrix) menus again.
  6. Select the number in list that corresponds to your matrix (presumably 1:[A]) and press [ENTER]
  7. The command line shows det( [A]
  8. Complete the command by closing the parenthesis and pressing [ENTER]
  9. Wait for the result to be displayed.

Nov 01, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

FX-9750GPlus Calculator: I want to solve the goodness of fit problem on my ...


Part A shows you how to enter your data and calculate some statistical values.

PART A
In the main menu select [STAT] icon to enter Stat mode and display the statistical data lists. Use the satistical data lists to input data and perform statistical calculations. Use the arrows to move the highlighting around the lists.
Exemple: Enter the following values in List 1
1st line enter 90 [EXE]
2nd line 85 [EXE]
3 79 [EXE]
4 75 [EXE]
5 70 [EXE]
6 68 [EXE]
7 56 [EXE]

When finished you press [F2:Calc], then [F1:1Var] and the statistical results appear on screen.
Title of screen : 1-Variable
x bar =74.7142857
Capital Sigma x= 523
Capita Sigma X squared = 39851
x lower case sigma n = 10.5249945
x lower case sigma n-1= 11.3682934
n = 7
Scroll down with Down arrow to access other data
minX =56
Q1=68
Med =75
Q3=85
Xbar -x lower case sigma n =64.1892911
x bar + x lower case sigma n = 85.2392802
maxX=90
Mod=90

All you have to do now, is to look at the theory you learned and interpret what these values mean.


PART B
  1. Once you enter your data [MENU][STAT],
  2. press [F1:Graph],
  3. select Gph1, Gph2, or Gph3.
  4. Once the graph of the experimental data is drawn, you will have access to the diverse regression models.
  5. Your choices are
  • [X:Linear]
  • [Med-Med],
  • [Quadratic :X^2]
  • [Cubic;X^3]
  • [Quartic: X^2].
  • Press [F6] to scroll right to access the others:
  • [Logarithmic:LOG],
  • [Exponential :EXP],
  • [Power :Pwr] and
  • [Sinusoidal:Sin]
  1. After you select a model and press [EXE], the screen displays the equation and its various coefficients.
  2. On that same screen, you have a menu option [F6:Draw].
  3. If you select it, the regression curve will be drawn on the same screen as your statistical graph.
  4. This allows you to judge if the fit is good. If it is not, you have the option to choose another model.
  5. The other option [F5:Copy] allows you to save the regression equation in the Y1, Y2, etc. variables.

May 16, 2010 | Casio FX-9750GPlus Calculator

1 Answer

Some of the characters are fuzzy on the display, not allowing me to access them. How can I fix this?


As you know, the calculator uses a system of menus activated by the F1, F2, F3, etc. keys. However when a submenu menu option is not available in the context of a problem, it will show on the display as a greyed out option (fuzzy) and it cannot be chosen.

Mar 07, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Solve Permutation and Combination


Turn calculator ON
If you do not see icons, press MENU key.
Use arrows to move focus on the RUN application and press EXE
Press the [OPTN] button.
A set of thumbnails (TABs) appear on the lower part of the display screen.
Each Tab/Menu is activated by the Function key just below it.
Press the F6 Key corresponding to the right pointing arrow
Press [F3:Prob] to reveal the probability functions.

That is what you see
0b633e1.jpg

If you press the F6 key you get the other options.
dd04f93.jpg
On the first screen above, the nPr menu corresponds to the permutations, while the nCr menu corresponds to the combinations.

To use them you need to enter n (the larger value), press the key corresponding to the calculation (F2 for nPr and F3 for nCr) and then press the smaller number (r). See screen below.

While the menus are displayed at the bottom of the screen you can use the other calculator keys to enter number, etc. As long as you do not press the Function Fx keys you wont activate them.

On the screen
  1. I set my calculator to the screen that is shown on the first screen capture
  2. I enter 15
  3. I press the F3 key: the Bold C is inserted after the number 15
  4. I type in 6
  5. To get the number of combinations that select 6 objects out of 15 ones (15C6) I press the [EXE] key.
  6. Result is 5005

7ddb6a5.jpg

To respect the wishes of the asker, I showed all the steps, with screen captures to support the text. That is time consuming.
If this post happens to teach you something, please take the time to rate it accordingly. To show you apprerciation.

Dec 21, 2009 | Casio CFX 9850GB Plus Calculator

2 Answers

Characters & menus display incorrectly


It is a display driver issue. You can buy a new one or get it repaired ($100).

Feb 10, 2008 | Texas Instruments TI-85 Calculator

1 Answer

Random characters lines and pixels


I've had a similar problem in the past with my TI-86. It still happens sometimes when I don't use it for a while. To fix it, all I did was set the screen to its darkest setting and left it on for 10 minutes (keep it from turning itself off, by pushing buttons every few minutes.) It works great, and the calculator is fine unless you leave it unused for a month or so. A similar solution may work for you.

Dec 12, 2006 | Texas Instruments TI-83 Plus Calculator

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