iFixit - Answers With Device "Casio Calculator"

Casio FX-991ES Plus: Not working. No display. Better also changed. what should I do?

Mon, 23 Mar 2026 03:47:59 -0700

My Casio fx991 es plus calc not working what should I do? No display battery also changed. Advise me please.

⟐ Answered March 23, 2026 at 3:47 MST

Casio FX-991ES Plus: How to repair the display

Tue, 08 Apr 2025 23:29:40 -0700

How to repair the display of a Casio FX-991ES Plus Calculator

⟐ Commented April 08, 2025 at 23:29 MST

casio fx-991es plus: LCD has blotch after I dropped my calculator. Can this be fixed?

Fri, 16 Dec 2022 04:22:43 -0700

I dropped my calculator the other night and some faint cracks and a blue blotch runs vertical across the lcd. It still works but the numbers where the blue blotch is can't be seen. Can I fix this somehow? Or is it possible to have the lcd replaced?

⟐ Commented December 16, 2022 at 4:22 MST

Casio FX-991ES Plus: How do I fix my calculator that only runs on solar power?

Sat, 23 Mar 2024 18:15:54 -0700

My Casio fx-991ES PLUS was dropped and now the display does not light up unless it is under a light source. It has a mini solar panel which I assume it using for power and it has new batteries in it but they do not seem to work. Is there something I can do to fix it?

⟐ Commented March 23, 2024 at 18:15 MST

Casio FX-991EX: Calculator is in 'PAUSE' mode

Fri, 02 Jan 2026 22:08:15 -0700

The calculation was done in VECTOR mode from the menu. When trying to do something, the calculator hangs, after clearing by the 'ON' button, you can see this status of MENU. Apart from these 3 modes, no other mode is showing, if I want to scroll up or down, the pause sign (2nd picture) is coming on the upper right side.

⁉️ How to get back all mods like before?

⟐ Commented January 02, 2026 at 22:08 MST

Casio fx-82ES: How to remove f(x) always showing it

Wed, 29 May 2024 14:23:13 -0700

in my calculator i cant find any answers because it is always showing f(x) in it

in my calculator i cant find any answers because it is always showing f(x) in the screen.how can i remove it?please give an appropriate solution for this

⟐ Commented May 29, 2024 at 14:23 MST

Casio FX-991ES Plus: Facing Problem on my calculator

Sun, 01 Jun 2025 23:52:08 -0700

My calculator is fully reversed. The number is reversed. Everything is rotated into 90 degree. How can i fix this problem?

⟐ Answered June 01, 2025 at 23:52 MST

Casio FX-115MS: Why is my screen black?

Wed, 14 Oct 2020 01:24:16 -0700

I turn on my calculator and the screen is completely black.

⟐ Answered October 14, 2020 at 1:24 MST

Casio fx-82ES: Why does each answer equal 0?

Thu, 16 Mar 2017 16:59:55 -0700

My calculator answers each question as 0 and true or false.

For example if I do 2+2 it says that equals 0

and has the word false underneath it in capital letters.

⟐ Answered March 16, 2017 at 16:59 MST

Casio fx-82MS: No display. I'm trying to turn it on but it isn't working. What to do?

Thu, 25 Jul 2019 07:36:34 -0700

I'm trying to turn my calculator on, but it isn't working. How do I fix it?

Model - CASIO fx-82MS

⟐ Answered July 25, 2019 at 7:36 MST

Casio fx-82ES: Why is my calculator showing a decimal as the answer?

Sat, 27 May 2023 10:52:56 -0700

Whenever I use my calculator, and do an equation, for an example, 2+2. It would always give a decimal as the answer when clearly it is not. For 2+2, it says 4.0 instead of 4. For 9.2+1.2, it says 1.0 instead of 10.4. I really don't know what to do because I have finals coming up soon.

⟐ Answered May 27, 2023 at 10:52 MST

Casio fx-9750GII: Why is my calculator screen faded/black?

Wed, 15 Feb 2023 17:51:14 -0700

I don’t use my calculator often, but I always keep it in my backpack. I pulled it out one day and noticed that my screen was faded/dark, and I have to click a button multiple times for it to work. Is my calculator broken? Is there a way to fix it?

⟐ Commented February 15, 2023 at 17:51 MST

Casio FX-991ES Plus: How to fix calculator suddenly goes off after calculation

Sun, 14 Sep 2025 05:15:30 -0700

As soon as I type any question and then press equal to it will give me the answer but it will suddenly go off in 5 seconds

⟐ Commented September 14, 2025 at 5:15 MST

Casio FX-991EX: keypad does not work properly

Tue, 05 Aug 2025 03:58:29 -0700

key 2 and key 1 both work as 1
key 4 and key 5 both work as 4
key 7 and key 8 both work as 7
key STO and key ENG both work as STO
key ((-)) and key (.,") both work as ((-))
key STO and key ENG both work as ENG

⟐ Answered August 05, 2025 at 3:58 MST

Casio fx-82ES: How to replace the plastic sheet that connects lcd with remaing part?

Mon, 03 Apr 2017 04:57:28 -0700

i remove the plastic sheet unintentionally and now my calculator is not displaying anything what should i do now ?

⟐ Answer accepted April 03, 2017 at 4:57 MST

Casio FX-991EX: Can I fix the calculator’s screen?

Wed, 22 Feb 2023 03:20:14 -0700

The screen has been broken for over a month now. And I really really would love to get some help on how to fix it. They said the company doesn’t sell parts of the screen but Is there like any way or anything?

Casio FX-991ES Plus: need help to repair my calculator

Sat, 20 Mar 2021 08:50:37 -0700

i guess water fell on my calculator. now its not working. i have to use my calculator in my papers which are starting from monday what shoukd i do?

⟐ Answered March 20, 2021 at 8:50 MST

Casio fx-580VNX: Why my calculator is not turn on?

Fri, 19 Dec 2025 00:43:18 -0700

my calculator suddenly got off and now it is not turn on? what should i do now?

⟐ Answered December 19, 2025 at 0:43 MST

Casio fx-9750GII: Why are my function keys not working properly?

Wed, 30 Nov 2022 04:41:24 -0700

My function keys are not working properly.

In Run-Math program, if I press F1, nothing happens. If I press F2, it opens a list of options in the botton (LIST, MAT, CPLX, CALC, STAT). If I press F3 it opens another list of options (V-WIN, FACT, STAT, GRPH, DYNA). If I press F4, it acts as going into the previous screen (For example, If I am in Run-math and I was in the menu before, it goes to the menu and if I press it again it goes back to the Run-math). F5 acts as the Left arrow key in text editors. F6 acts as moving back a line (selecting the previous line).

Every other button work as intended.

I tried to reset the system through the menu, but since the function keys aren’t working properly, I can’t select the reset option. I’ve also tried the small button on the back of the calculator, but it doesn’t do much.

⟐ Answer edited November 30, 2022 at 4:41 MST

Casio fx-CP400: Touch screen not responding, and when it does it presses wrong things

Fri, 03 Apr 2026 04:40:45 -0700

Touch screen will not work but the little times it does it just presses a button on the opposite side of the screen. Screen has no cracks or scratches. Never been dropped hard or anything. Resetting the calculator does not fix it and now i can't use the calculator since i am stuck in the language option screen. Please help and thank you!

⟐ Answer edited April 03, 2026 at 4:40 MST