TI-92 replaces previous graphing calculators with its larger display, computer-style QWERTY keyboard, graphical user interface, 3D graphing features, and its Motorola 68000 processor.
TI-92 wont turn on
Calculator does not respond to "on" button.
AA Batteries are dead
If your calculator does not turn on, first check the batteries. It is likely that the AA batteries simply out of power. Check this by replacing them with new AA batteries and attempting to turn the device on. You can see how to to replace the AA batteries here. If this doesn't work, you may have a bad OS.
Bad Operating System
If both your lithium battery and AA batteries are working, but your calculator still isn't functioning properly, remove one of the AA's. Hold the [APPS] key and replace the battery. While still holding the [APPS] key, turn the device on. If it turns on, the device will say something along the lines of "Press I to install code." If this message is given, press the [9] key. If the device gives a message about needing to install the OS, you will have to replace it.
Dead Backup Battery
If the previous suggestions prove to be no help, then you may need to check the lithium backup battery inside the device. This procedure can be shown in the guide "Replacing Texas Instruments TI-92 Backup Battery".
Dim Screen Presentation
Screen is difficult or impossible to read.
Contrast Issues
The screen may appear to be faded if the contrast is too low. To fix this repeatedly press and release the Diamond key and the [+] key in succession. If this does not work the problem might be due to high contrast. In this case you need to press and release the Diamond and [-] keys in succession. If your screen is still difficult to read you may have low batteries.
Low Battery
As the batteries start to deplete the screen starts to dim. This might be causing the problem. To test to see if this is the problem, replace the old alkaline batteries with new ones. If the screen remains dim you might have some internal hardware malfunction.
Power loss while in use
Device shuts off while operating.
Device is Idling
When the device is in use, but not being given commands, it will turn off to save power. This occurs after only a few minutes, so this is not actually a problem, as long as the device will still boot. Any information on device should reload when you turn it on.
Power Loss
If the device does not turn back on after it has turned off from power loss, it is likely that the batteries have simply run out. If this is the case, it is easy to remove the case and replace them following this guide . If this does not work, consider reading the troubleshooting guide for "TI-92 wont turn on."
Slow Response
Calculator seems to "lag" or act slowly.
Low RAM
Your memory may be filled up with set variables and programs; therefore, there may not be enough available memory to run programs or compute problems.
Display issues
Screen appears overly pixelated, distorted, or damaged
Broken display
The display inside of your calculator may be physically damaged. If you see dead pixels, or other warped images that are clearly deeper than the physical screen, you may need to replace the display. The guide for replacing the LCD display is shown here.
Cracked Screen
Screen appears damaged, but images are still shown.
Screen damage
If the physical screen on the outside of your calculator is cracked or otherwise broken, you will have to open the case and replace the plastic sheet that covers the display. Click here to see the guide relating to accessing and repairing the screen.
Malfunctioning Keyboard
You press buttons but they do not appear to registered or have any affect.
Sticky Keys
Dirt or other materials may have cause the keys to jam or get stuck. This would prevent the keys from fully being pressed. To fix this go to the Keyboard Repair Guide.
Dirty Contacts
There might be something blocking the keys from the contacts on the motherboard. In this case you will have to use the Motherboard Guide to access the motherboard and then clean off the contacts or remove anything blocking the keys form the contacts.
댓글 13개
Round Back-up battery located under plastic lid on back of calculator.
Daniel Logue - 답글
Have a black screen, changed batteries, have pressed the diamond key with (-) still no change. Other suggestions?
Michelle Eichelberger - 답글
If neither replacing the 4 AA batteries or replacing the round back-up battery work then I guarantee you have CORROSION on one of the terminals…
Remove all screws on the back (except the one holding the round battery) and look at each of the 4 (FOUR) terminals where the 4 AA batteries make contact with the green board. Clean the contacts and should be fixed after putting it back together.
Miguel Angel Carrion - 답글
Your guarantee was golden!
Thank you very much.
Alex Gian -
Battery terminal corrosion was the problem with my TI-92 when the diamond button stopped working. The corrosion was pretty bad on one terminal (face down lower-right) and mild on another (face down lower-left). I had to gently scrape some of the corrosion off and thoroughly clean the area, but now the calculator is working fine again. Thanks for the tip.
J.J. Lynch -
Have some calculators with the same problem: New batteries; when push ON button doesnt start the screen, but when I connect the TI Presenter, the screen turns on the device and screens without any problem, disconect the cable an the display turns off. Is it a configuration problem or hardware? Thanks for any possible solution.
Carlos Adrián Romero - 답글
Try pressing the ON several times - mine needs to be pressed hard. If all else has failed I would narrow it down to software issues. Will have to reset the memory somehow. I can’t be of any more than that.
Miguel Angel Carrion -
If your calculator only turns ON when plugged to an external device, I would still suspect corrosion in one of the battery terminals. Open it up and inspect it. I don’t think it’s a configuration issue or software.
Miguel Angel Carrion - 답글
Thanks for the comment, I have inspected but there is no sign of battery corrosion, it looks clean . There is no sign of any damage or broken parts
Carlos Adrián Romero -
Problem Solved. It was an issue of battery corrosion. I had to open and clean the board circuit connection of corrosion. Just sanded and clean with alcohol the metal plate and voilá!, the screen turns on. Thankyou very much for the tip, it was very helpfull.
Carlos Adrián Romero -
I fixed the corrosion but it intermittently turns on.
what. - 답글
I have a feeling its a bad connection somewhere. Considering the method in which the battery “pack” is connected. Hardwiring the contact down may fix it
what. -
These calculators are very well built and I honestly believe that corrosion around the terminals are almost always the issue after being stored for a long time. Check the batteries, terminal contacts and clean them thoroughly is my only advice.
Miguel Angel Carrion -