TI 92 Turns on but has a black screen. I have A TI 92 that turns on, and off oddly enough, but the screen is completely black. I have replaced all batteries, including the back up button cell battery, but the screen remains black. I have also tried to turn the darkness down via the diamond and + and - buttons. I have also tried a hard reset via holding DEL or the APPS and its still a no go. Is it junk or fixable?.

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This is expected behavior when batteries are replaced and you don't need to reset the device, simply adjust the contrast more than you would think it should take.
See the answer to a similar question at When powered on the LCD screen is dark blue.
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