My ti-85 screen is too light
I changed all the batteries and tried darkening the screen by holding down the 2nd button and pressing the up arrow and neither of these things worked.
Office Equipment & Supplies - Texas Instruments - TI-85 Calculator
Answers & Comments
The problem is that you're holding down the 2ND button. The correct procedure is to press and release the 2ND button, then pressing and holding the Up-arrow button.