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I have no idea how you managed to fix those pixels without opening up the calculator and replacing the LCD, I guess your calculator is special. I think your best bet is to try what you did before and finagle with the screen until the pixels work again. There could be a loose connection somewhere but there’s no way to be sure without opening the calculator.
If you’re willing to open up the calculator, reaching the LCD isn’t very difficult. The plastic cover over the screen is held on by weak glue and you can just take a suction cup and pop it right off (I’ve done it to my own TI 84 Plus CE). You can now perform whatever methods you think will work for fixing the dead pixels. Since the cover was held on by glue, you can probably just put the cover back on and it will be perfectly fine, I replaced the glue on my calculator with superglue so dust wouldn’t get in, but I wouldn’t suggest that for you in case the screen ever breaks again.
One build-in feature of the calculator you’ll find useful is the self-test feature. To use it:
- Archive any information you want to keep since this will clear the RAM!
- Press [mode]
- Press [alpha]
- Press [s] (the [ln] key)
- You should see something that says “Enter Self-Test?” If not, try it again.
- Press [enter] three times
- Congratulations, you’re now in the Diagnostics section
- Press  to run the LCD test, it will display numerous colors and patterns that can help fix the pixels, and help you see which pixels are fixed or not!
- Press [enter] to cycle through all the colors and patterns
- Press [clear] to exit Diagnostics, your RAM will be cleared.
If you need assistance using the Diagnostics, I suggest you look at this video that walks you through what it is and how it works.
Good luck, please let us know how it turns out!
EDIT: I recently had an issue with stuck pixel on my TI 84 Plus CE. If anyone else has a similar issue, I’ve made a program that can jar the pixels into working again.
WARNING! Do not use this if you have epilepsy. I have the program here. It requires you to install some libraries so it can work properly, you can find those here.
Once you send over all the files, press [2nd] then press  then press the down arrow 6 times (the arrow should be pointing at the text “Asm(“ ) then press [enter]. Now press [prgm] and scroll down to the program named “PIXELFIX” and press [enter]. Your home screen should now look like this: “Asm(prgmPIXELFIX” (without quotes of course). Press [enter] one more time to launch the program. Leave it running for an hour (you may want to connect your calculator to a charger). After an hour, press the down arrow key to quit the program. Hopefully your pixel will be fixed! It worked for me so I hope it works for everyone else too.
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