iFixit - Answers With Device "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 3월 23, 2026 at 3:47 GMT-7

Texas Instruments TI-83: Why TI-83 wont turn on

Thu, 26 Feb 2026 06:46:07 -0700

Hi.

I'm having a problem with my TI-83, it doesnt turn on.

I have replace the batteries, the 4 AAA and the

backup one, and followed all the hints supplyed in TI,

troubleshouting section.

It still doesn turn on.

What can I do?

⟐ Commented 2월 26, 2026 at 6:46 GMT-7

TI-84 Plus Silver Edition: My buttons won't work

Mon, 23 Aug 2021 15:02:23 -0700

When I turn my calculator on, the calculator will not recognize when I push any of the buttons.

⟐ Commented 8월 23, 2021 at 15:02 GMT-7

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 4월 08, 2025 at 23:29 GMT-7

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 12월 16, 2022 at 4:22 GMT-7

TI-84 Plus Silver Edition: Why my calculator is not charging?

Sat, 20 May 2023 22:27:17 -0700

When I plugged in the charger, it shows greenlight but still low battery even though I charge it overnight

⟐ Answered 5월 20, 2023 at 22:27 GMT-7

Texas Instruments TI-30X IIS: Automatically adds a digit to the end of my entry

Mon, 15 Apr 2024 19:45:05 -0700

My calculator automatically adds a 9 to my last number every time I try to do math. For example, I type 5 + 6 and expect =11, but calculator does 5 + 69 and I get =74 :(

The 9 button does not appear to be sticky.

⟐ Commented 4월 15, 2024 at 19:45 GMT-7

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 3월 23, 2024 at 18:15 GMT-7

TI-84 Plus Silver Edition: Where can I buy replacement parts for TI-84?

Fri, 16 Sep 2016 19:59:49 -0700

How can I purchase motherboards and screens for TI 84?

⟐ Answered 9월 16, 2016 at 19:59 GMT-7

TI-84 Plus Silver Edition: Calculator won't turn on

Sat, 17 Jan 2026 20:38:49 -0700

My TI-84 Plus calculator will not turn on. It is one year old, and seems like new, but won’t turn on. Any suggestions? I can’t find a reset button on it.

⟐ Commented 1월 17, 2026 at 20:38 GMT-7

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 1월 02, 2026 at 22:08 GMT-7

TI-84 Plus CE: TI-84 Plus CE My calculator says: Validing OS calculator will restart

Wed, 16 Jul 2025 07:16:06 -0700

My calculator says:

Validing OS

calculator will restart when validation complete. And starts blinking over and over again and I cannot fix it, I tried to charge or reset it and It doesn´t work.

⟐ Commented 7월 16, 2025 at 7:16 GMT-7

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 5월 29, 2024 at 14:23 GMT-7

Texas Instruments TI-83 Plus: Calculator wont turn on

Wed, 15 Jan 2025 19:14:29 -0700

I tried everything that I could find on the troubleshooting, but nothing works.

Help PLEASE!!!

⟐ Answered 1월 15, 2025 at 19:14 GMT-7

HP-41C: HP 41C Switching On Problem

Tue, 30 Dec 2025 12:10:47 -0700

I have 41C. Since last few days it does not switch on. It means it does switch on some time. The batteries have total voltage of 6 VDC.

⟐ Commented 12월 30, 2025 at 12:10 GMT-7

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 6월 01, 2025 at 23:52 GMT-7

Texas Instruments TI-Nspire CX: TI-Nspire CX Cas Damaged Charger Port

Tue, 07 Sep 2021 08:37:33 -0700

This question is specifically for the CX CAS model of the TI-Nspire calculators.

The calculator is fully functioning except for the fact that it won't charge, unless the cord and charging port are aligned a certain way. It is not a problem with the cord, but with the charging port.

It seems that its contact points to the motherboard have been disconnected, as it has come loose and moves independently of the chassis, and only with luck can it be placed a certain way so that the calculator may charge. I would have to open it up and solder the contact points back to the motherboard, but I don't have the tools nor the know-how to do it.

I tried looking for ways to just charge the battery itself, since it can be easily removed with a Phillips screw driver, but haven't found the parts that would fit just yet. Any way to be able to charge it up would be appreciated.

⟐ Answer edited 9월 07, 2021 at 8:37 GMT-7

TI-84 Plus Silver Edition: How do I fix the screen on my calculator?

Sat, 15 Oct 2016 14:56:32 -0700

A small table was placed heavily on the screen and now there is a small mark on the screen that is light in the middle and dark in the surroundings. When I type in a number, I can faintly see through this mark, but it gets a bit frustrating, and I begin Calculus next semester. I cannot afford a new calculator and this one is functioning very well. This screen problem is a nuisance!

⟐ Commented 10월 15, 2016 at 14:56 GMT-7

Texas Instruments TI-Nspire CX: LCD screen is broken on my TI-nSpire CX

Fri, 08 Dec 2023 11:39:08 -0700

I had someone drop my TI- nSpire CX calculator, and now the LCD screen is cracked, so no clear image appears. Is there a way to replace this screen or is the calculator ruined.

⟐ Commented 12월 08, 2023 at 11:39 GMT-7

TI-84 Plus CE: How to replace screen glass?

Thu, 07 Sep 2023 04:31:13 -0700

Hello. I have a TI 84 Plus CE that has just been sitting in my backpack for the last couple of months (in hindsight wasn’t my best idea.) I took it out of my pack one day and found out the screen was cracked (pic below.) Is there any guide to fix it? The panel itself is not broken but the glass separating them is. Thanks!

⟐ Answer accepted 9월 07, 2023 at 4:31 GMT-7