crwdns2934241:0crwdne2934241:0 TheLastMillennial

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Unfortunately, this is a common problem with the TI-83 Plus. Over time, the glue that holds the screen ribbon cable together starts to fail and causes screen artifacts like yours.

It will only get worse and requires soldering skills to fix. There's a repair topic on a calculator forum called Cemetech: https://www.cemetech.net/forum/viewtopic.php?t=5161

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