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The display of my TI-82 have a dot in the center as if it had exploit, what is the reference of display and way for replace it?

The TI-82 Has had multiple design changes, and revisions. You would need to disassemble the device, and acquire the LCD Model Number to get the proper one. there SHOULD also be a sticker on the back that says the revision of the TI-82 here is a generic teardown of a TI-82 calculator. Texas Instruments TI-82 Teardown