Question about Texas Instruments TI-86 Calculator

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Blank lines across the screen of a TI-86 graphing calculator

I have a TI-86 graphing calculator and I have had it for quite a few years. I turned it on after not using it for a while and just put in new batteries, but now it has blank lines across the screen. It looks to me like it just has dead pixels from being so old, but I was wondering if there is anything I can do to fix it or would I have to buy a whole new calculator?

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Try this, hook up new battery and go to MODE and darken and lighten the screen.. do it ten to fifteen times. if that doesn't help, try hook up most left and most right's battery terminal to a DC supply at 4.5V. dont go above 4.5 it will fry your calc (it is design to handle 3V). now you are forcing extra juice into the dead LCD screen lines... and reapeat the MODE + darken trick. I fixed mine like that! Works! and remeber to leave it completely black(darkest) for a while to keep that dead line alive!

Posted on May 07, 2011

  • Erik Hoet Jun 18, 2011

    I'm confused. Main battery is 4 AAA @ 1.5 v each. That's a 6 volt total. Memory battery (CR1620) is 3.0 V. So where are you connecting 4.5 V?? EPH

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Hello,
Clear the screen, reset memory.That may solve the problem.
Hope it helps.

Posted on Sep 23, 2009

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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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I hadn't used mine in years and had the same problem. Essentially you just need to give it a workout to get all the pixels working properly again and then it'll be just fine. I adjusted the contrast between full dark and nothing multiple times and turned the calculator on and off after each cycle and now it works like new.

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