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Texas Instruments TI-92 Troubleshooting

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.


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.

Комментариев: 3

Round Back-up battery located under plastic lid on back of calculator.

Daniel Logue - Ответить

Have a black screen, changed batteries, have pressed the diamond key with (-) still no change. Other suggestions?

Michelle Eichelberger - Ответить

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 - Ответить

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