TI doesn't offer first-party parts, so you'll either have to find a for-parts model on Ebay or find parts on a site like this: https://world.taobao.com/item/1957647300...
The hardware revision of your calculator will affect which screen you need, could you tell me the short combination of numbers and letters on the back of the calculator, to the right of the serial number?
Once you have a screen, these guides should help you swap it out:
Texas Instruments TI-Nspire CX defekte Taste reparieren
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