iFixit - Answers With Device "TI-84 Plus CE"

TI-84 Plus CE: My Calculator won’t turn on or charge

Mon, 08 Dec 2025 09:20:40 -0700

Hello! My TI-84Plus CE just completely died the other day. We tried to charge it and it shows now signs that it is charging. The screen doesn’t light up or show anything. We tried replacing the battery, and still the calculator shows no signs of turning on.

Is there anything else that we can trouble shoot?

⟐ Answered December 08, 2025 at 9:20 MST

TI-84 Plus CE: My alpha key is no longer Functioning

Mon, 29 Sep 2025 00:46:58 -0700

The alpha key in my Ti-84 plus CE is not working i have looked everywhere on how to fix it i could not find anything about it. I did open it up however i was scared to go any further because it seemed the everything is attached to the front black face piece . I just need a little guidance. (Everything else works great)

⟐ Commented September 29, 2025 at 0:46 MST

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 July 16, 2025 at 7:16 MST

TI-84 Plus CE: The calculator won’t work

Wed, 16 Jul 2025 06:38:33 -0700

It brand new just got it. I plugged it in and screen turned on but says something and turns off.

⟐ Commented July 16, 2025 at 6:38 MST

TI-84 Plus CE: How much the replacement usb charging port

Wed, 04 Jun 2025 11:55:17 -0700

Hi, how are you?

My TI-84 Plus CE mini usb charging port was broken.

So how much fix charging port?

⟐ Commented June 04, 2025 at 11:55 MST

TI-84 Plus CE: TI 84 Plus CE is stuck in the validating loop

Thu, 24 Apr 2025 06:23:31 -0700

Hello,

I am trying to fix the calculator. When plugged in it is stuck in the validating loop. I have attempted to remove the battery, download the TI software, but when I plug it in it through the USB it does not recognize the calculator. There is mention of a button battery that can be replaced but I cannot find that either. Should I purchase a whole new battery? Is that maybe why it will not get out of the validation loop or be recognized?

⟐ Answered April 24, 2025 at 6:23 MST

TI-84 Plus CE: A cap or resistor blew on the mother board.

Mon, 21 Apr 2025 09:26:04 -0700

what size is the so I can replace it, calc still works. Or does anyone know what this one controls or go too?

⟐ Commented April 21, 2025 at 9:26 MST

TI-84 Plus CE: Can the screen be replaced?

Mon, 03 Mar 2025 12:51:55 -0700

if the screen on a TI-84 plus CE is cracked or in some other way damaged, would there be a way to remove and replace it without damaging other parts? or really any way to remove it at all?

⟐ Answered March 03, 2025 at 12:51 MST

TI-84 Plus CE: Blank Line Artifact Down Center of Display!

Sun, 02 Feb 2025 21:00:59 -0700

Note this only happened after the battery died and was replaced. Fixable?

⟐ Answered February 02, 2025 at 21:00 MST

TI-84 Plus CE: What voltage is required across the exposed rear charging pads?

Wed, 22 Jan 2025 13:50:32 -0700

Hello,

The back of the calculator has two metal pads that I've seen used in charging stands for 10+ calculators in classrooms. I'd love to make my own and I was wondering if anyone had done any research on how this system works.

Does it work as a LiPo charger where it needs to shut itself off when the battery is above a certain voltage, or is the charge controller embedded in the calculator? Also, more pertaining to the title, does it draw the same 5V that it gets through the USB port or is it something closer to 6V (I saw a TI forum post indicating that the nominal battery voltage was roughly 6V but I haven't actually looked at the battery myself).

Thanks!

⟐ Answered January 22, 2025 at 13:50 MST

TI-84 Plus CE: Where can I find a replacement charging port?

Mon, 09 Dec 2024 13:50:50 -0700

Does anyone know where I can find replacement charging port? I can't seem to find the exact one anywhere. I let my friend borrow my calculator and half the pins in it are now broken off. I know how to solder and have a soldering iron I just can't seem to find the port anywhere.

TI-84 Plus CE: The place where I insert my charging cord is not working

Thu, 28 Nov 2024 07:26:55 -0700

I’ve had this calculator for a while now, i used it a lot in Algebra 1 but not much in Geometry so I didn’t really pay attention to it that much then. As i was heading to Algebra 2 this year i realized that i would use it. I found the calculator and was ready to charge it. I found it difficult to plug my charger in. Yes, it was exactly the right cord. I double checked with friends that own the same calculator. Please how can i fix this, I definitely can’t afford a new one.

does anyone know if this would work?

⟐ Answered November 28, 2024 at 7:26 MST

TI-84 Plus CE: What is an acceptable battery voltage?

Tue, 12 Nov 2024 15:27:16 -0700

I know the TI-84 Plus CE has a 3.7V battery. It wasn't turning on so I checked the voltage using a multimeter and got 3.4V. I thought this was enough to power the calculator but after a good night on the charger it worked. This confuses me, so I was hoping someone smarter than me could explain this? Is there a general rule of thumb/threshhold for hpw low a bettery can be before it needs replaced/charged? Thanks!

⟐ Commented November 12, 2024 at 15:27 MST

TI-84 Plus CE: No Title (You should edit this question)

Wed, 23 Oct 2024 18:12:40 -0700

Well for me im pretty sure my story is somewhat the same but a bit different.

I had accidently let my calculator drain the battery and die, now that i try to charge it. It wont charge and it kept flashing "Calculator will restart when blah blah is done" then i tried the "2nd" and "del" method and now im stuck with the calculator flashing at me to wait and "Please install operating system now." and "Press [clear] to erase all storage" i tried erasing the storage but once it hits "3E' while erasing the storage, the calculator resets and keeps flashing. I even tried hitting the reset button on the back and it basically did nothing. So now im stuck with a broken calculator. I have tried replacing the battery and it did nothing... ;-;

⟐ Answered October 23, 2024 at 18:12 MST

TI-84 Plus CE: How can I buff out light scratches from the outside screen?

Sun, 06 Oct 2024 16:48:45 -0700

Someone gave me this calculator for my daughter. I was cleaning it and I really should have researched first but I didn’t. I used a Q-tip dipped in alcohol and rubbed all over including the screen. I didn’t notice if these scratches were already there or if I caused them but I would love to get them out. I don’t think they’re actual scratches because there’s no feel to them. They look more like when you take your finger nail and run it across the screen it leaves a light mark. I tried toothpaste but that didn’t work.

⟐ Answered October 06, 2024 at 16:48 MST

TI-84 Plus CE: My calculator says error: memory. What do I do?

Sat, 05 Oct 2024 01:26:39 -0700

It says error: memory. I can’t get out of it and can’t connect my calculator to any device. What do I do?

⟐ Commented October 05, 2024 at 1:26 MST

TI-84 Plus CE: TI-84 Plus CE repeatedly turning on and off when charging.

Thu, 06 Jun 2024 18:43:01 -0700

My TI-84 Plus CE will repeatedly turn on and off repeatedly in about 1 second intervals while connected to the charging cable, regardless of the power source its connected to (wall outlet, laptop, power brick etc.). It will not turn on at all if not plugged in. I've tried pressing the reset button to no avail. The cable is essentially brand new. This also happened while it should have been at full charge, though it had been about 2 months since it was last fully charged, but it wasn't used in that time until I tried to turn it on recently. I tried taking the battery out and putting back in, and that didn't make a difference either.

⟐ Commented June 06, 2024 at 18:43 MST

TI-84 Plus CE: My calculator is not charging or turning on

Wed, 01 May 2024 19:43:38 -0700

Hi, I just got my calculator (TI-84 plus CE) in the mail and it wasn’t turning on so I plugged it in using the USB cable provided that says it’s for “data transfer and convenient charging”. I am worried because the screen is flashing with a message that says “calculator will restart when validation is complete” so it doesn’t seem to be charging. It’s still not turning on and I have no idea what to do, please help. (This calculator doesn’t have a light on the side so I am unable to see if it is charging or what the battery percentage looks like)

⟐ Answered May 01, 2024 at 19:43 MST

TI-84 Plus CE: Why is my calculator flashing validating OS

Tue, 12 Mar 2024 14:04:48 -0700

Why is my Calculator flashing validating OS

⟐ Answered March 12, 2024 at 14:04 MST

TI-84 Plus CE: Part of screen is Grainy

Tue, 20 Feb 2024 21:22:08 -0700

I've tried reseting and it scrolling through the menus. Am I missing something or is it just broken?

⟐ Commented February 20, 2024 at 21:22 MST