crwdns2934241:0crwdne2934241:0 Jerry Wheeler
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iFixit does have a guide to reflowing the solder on the ribbon cable that's probably no longer making good contact. It appears to require a heat gun for the top cable, but the bottom one can be done with a soldering iron. [guide|172778|How to Repair a Glitchy TI-83 Plus Screen - iFixit Repair Guide]
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open