Augustine has a good suggestion, try removing the AAA batteries ''and'' the [guide|19372|backup battery], then try replacing them. If any of them are corroded, they may have permanently damaged the buttons.
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If that doesn’t help, here’s [|a guide] on getting to the keys that may help. I know it’s designed for the TI 83 Plus,but the TI 84 Plus has similar insides.
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If that doesn’t help, here’s a [https://www.ifixit.com/Guide/TI-84+Plus+Silver+Edition+Keyboard+Mat+Replacement/19488|guide on getting to the keys] that may help. Once you’ve gotten to the main board, check for any loose or dirty connections.
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If you find the buttons are beyond repair, you can buy a cheap, used calculator and [guide|11096|swap out the motherboard.]
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If you find the buttons are beyond repair, you can buy a cheap, used calculator and [https://www.ifixit.com/Guide/TI-84+Plus+Silver+Edition+Motherboard+and+Screen+Replacement/19486|swap out the motherboard].
Augustine has a good suggestion, try removing the AAA batteries ''and'' the [guide|19372|backup battery], then try replacing them. If any of them are corroded, they may have permanently damaged the buttons.
If that doesn’t help, here’s [|a guide] on getting to the keys that may help. I know it’s designed for the TI 83 Plus, but the TI 84 Plus has similar insides.
If you find the buttons are beyond repair, you can buy a cheap, used calculator and [guide|11096|swap out the motherboard.]