I've never dropped my 83 but the last time I turned it on, it displays random characters and pixel sometimes short lines. I can still perform calculations, but they are mostly obscured by these symbols, the same applies to nearly all aspects of the calculator including the graphing screen, programs, and apps.
I've had a similar problem in the past with my TI-86. It still happens sometimes when I don't use it for a while.
To fix it, all I did was set the screen to its darkest setting and left it on for 10 minutes (keep it from turning itself off, by pushing buttons every few minutes.) It works great, and the calculator is fine unless you leave it unused for a month or so.
A similar solution may work for you.
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Liquid Crystal Display (LCD) screens use less energy and display a clearer picture than the Cathode Ray Tube (CRT) displays that preceded them. These new LCD screens now dominate the computer monitor market. From time to time, however, pixels can become stuck and a green line can display on the screen. Removing this line is sometimes possible without sending the screen to the manufacturer for expensive repair.
Try to reboot your calculator to see if it helps by doing this:
*Remove one of the AAA batteries. Press and hold the [CLEAR] key. While holding [CLEAR], reinsert the AAA battery and then turn the calculator on. The calculator should display the message "RAM Cleared". Release the [CLEAR] key and then press it one more time to remove the message. *
Let me know if it helps or not.
same problem, broke my screen, ordered a new screen off ebay and replaced it. now it works fine most of the time but sometimes external display freezes. sometimes goes black, sometimes goes multicolor pixelated (full screen, in blocks, or lines) when this happens sometimes touchpad still works, others not. removing battery usualy temporarily fixes.
Check the batteries polarity. Perhaps it needs a "reset", some calcs do have a "button" therefor, some do if you press the start button for some seconds. Try to leave the calc overnight without any batt. inside.
Doesn't sound like a good situation. My knee **** reaction would be to reseat the cable and power to the LCD screen. If that doesn't work, I'd take advantage of the warranty. They might be able to get you up and running in short order. Hope this helps! Ron