Question about Texas Instruments TI-86 Calculator
Recently, I've used my old ti-86 and I saw too many lines across the screen that cut off the numbers appear on the srceen. How to fix that 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.
Posted on Jan 20, 2010
Hi I got a problem with Ti-86 which is a line of the screen pixel missing. I tried to increase and decrease the intensity of the screen (2nd and up, down). Also tried to go to MODE function. I have tried that for several times. It works great. The line of those missing screen pixel came back. I don't know why. Just try it.
Posted on Mar 09, 2009
Remove and replace the batteries should be first step. Also, I believe these have a smaller button-cell backup battery as well. Replace and reset to factory settings (backup any saved info if you can link with another TI calculator).
Posted on Mar 28, 2008
DO NOT LISTEN TO THIS GUY THAT IS TELLING YOU YOU CAN'T FIX IT. He has no idea what he is talking about. I just successfully fixed my TI which had about half of the horizontal lines completely dead. using the mode menu + brightness did not work so I opened the calculator and used hot air gun to carefully warm the connection between the black ribbon cable and the board behind the LCD. All the bad connections were between the board and the black folded ribbon cable. After warming it up I used a blunt small plastic object to glue the ribbon back to the board. The purpose of the hot air is to melt the glue.. The connection in question is hard to access because it is between the fold so you have to remove some of the black tape before you can stick something between the folds and access the connection. Good luck :)
Posted on Sep 02, 2012
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