The cable that connects the display to the board has failed. Unlike the color versions of the TI-84, the display is held onto the calculator with a TAB (Tape automated bonding) connection that cannot be removed non-destructively. You will need a TAB machine, new display (the cable will be damaged upon removal) and a lot of experience to get this right.
In addition, like the TI-84 Plus (also B&W), the board is held in with plastic - these need to be broken and fixed with screws in order to secure the board correctly again. Supposedly TI sells refurb calculators for $100 (they may want the bad one back), but it’s usually cheaper to get one from a high school/college student who only used it for 2-4 years (and took care of it and then forgot about it) or a bookstore who sells used TI calculators.
The TI-84 Plus (the one I own), the SE (yours) and the CSE (discontinued quickly) are all equally as disposable.
TI graphic calculators have always had failing screens. That why you cannot count on them in the work world.
Jack Liddel さんによる