20 Most Recent Texas Instruments TI-85 Calculator Questions & Answers

Have you input a formula?

Hello,
Make sure you have fresh batteries. Increase contrast

First possibility.
Press [2nd] and hold pressure
Press UpArrow and repeat this step

2nd Possibility
Press [2nd] key then release
Press UpArrow then release
Repeat the two steps in sequence till contrast is to you liking.

Hope it helps.

If it does not have it, use the equivalent formals Log_base b(a)= ln(a)/ln(b) or log_10(a)/Log_10(b).

I would try replacing the old reserve battery as well. Good luck, Paul

In the CATALOG there is a >Frac command that can be used with parentheses to multiply fractions.
(1/2)(1/3)>Frac
1/6

Press and release 2nd, then press and release down-arrow. Repeat as necessary. If you go too far, press and release 2nd, then press and release up-arrow.

Who says that -29.48 is the best value?

In response to your questions. Have you thought about contacting Texas Instruments Directly? Put in new (fresh batteries), and increase the contrast to the darkest, then reduce it. Do this a few times: It may bring the pixels back to life. If that does not work, consider setting aside this calculator and buying a new one. It suffers from old age, and it is not worth it to try to repair it. Try to get a used one: If you risk nothing you get nothing. Besides that 200 $ figure is erroneous. You can get some good Casios (with a Computer Algebra System) for about 150$. Or a TI84 Plus Silver Edition C (in color) for the same price. OR a N'spire CAS, or an HP 50 G. Need I list others?

Take it in for new screen,to be fitted,or by a new TV.

It may be time to get another calculator.

take out one battery. hold DEL key and put the it back holding that key.

It should reset everything. I had same problem on ti84

45 and 112 are relatively prime so no, it can't be simplified further.