crwdns2934241:0crwdne2934241:0 Zen Gunawardhana

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How do I fix nothing working but contrast?

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When the calculator turns on, the only function working is changing the contrast. You can put the contrast up and down, but you can't see anything being entered at any contrast. It seemed like it was the buttons, so I cleaned it, but it didn't seem to work.

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Texas Instruments TI-83 Plus

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open