My TI-86 screen had white lines (dead pixels) in the first and last rows. By following k_akima's remedy (set it to darkest and leave it for a while), I managed to get back the first row pixels to normal. The last row is still partially dead. Do you guys know any other solution to this?

SOURCE: TI-82 Screen Not Working or Black

Try a hard reset. Take out all the batteries, and while putting them back in, hold down the "DEL" key. Then, turn it back on and you can adjust the contrast by pressing the "2nd" key and the down arrow at the same time. I just got this info. online and it finally worked for me...good luck!

SOURCE: buttons on far right row of ti-84 plus clear the screen

Hello,
It seems like a harware problem. I think you shoul have the calculator repaired.

Hope it helps.

SOURCE: TI-89

If you make a custom, you can have the Toolbar F function keys operate as 7, 8, & 9. If you respond with a rating I'd even write one out for you, and make it where you just hit [2nd] [CUSTOM] for the use of those keys.

SOURCE: 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.

SOURCE: I need to enter a 3 x 3 matrix.

1. Press [2nd] [X to -1] under [MATH[ to access the (Matrix) menus.
2. Use right arrow to highlight [EDIT]
3. Press [1:A] to edit (create from scratch) the A matrix.
4. On the line MATRIX[A] line cursor blinks on 1
5. Enter m dimension (3) and press [ENTER].
6. Cursor moves to the second dimension (n). type 3.
7. Press [ENTER].
8. A 3x3 matrix template is displayed with A_11 element highlighted.
9. Replace the value 0 with your value for A_11.
10. Press [ENTER].
11. Type a value and press [ENTER].
12. When finished, press [2nd][QUIT] to exit the matrix editor.
    

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