iFixit - Answers With Device "Logitech MX Master 3S"

Logitech MX Master 3S: Cannot click left button

Tue, 31 Mar 2026 14:22:48 -0700

I bought this gear for around 1 year but it seems broken. I cannot click right properly. I have to click multiple times to complete the task.

⟐ Answered March 31, 2026 at 14:22 MST

Logitech MX Master 3S: What kind of switches does Mx Master 3s use?

Fri, 05 Dec 2025 11:28:46 -0700

What kind of switches does this mouse use and what is their estimated number of clicks? This question is also related to side navigation buttons. In my experience these buttons typically break first.

⟐ Commented December 05, 2025 at 11:28 MST

Logitech MX Master 3S: Logitech please please start selling replacement shells for the 3S

Tue, 24 Feb 2026 16:45:53 -0700

Bought a white refurb 3S several months ago and it's been a great mouse so far. However the rubberized finish means it stains really easily and is impossible to remove (I first accidentally got stains on it after peeling oranges) and now it looks awful.

It's very difficult to get hold of a replacement shell for the 3S (and non-S shells aren't compatible because the switches use a different spring), is Logitech intending to sell those as a replacement part anytime soon?

⟐ Answered February 24, 2026 at 16:45 MST

Logitech MX Master 3S: Left clicker button popped up

Mon, 22 May 2023 10:50:05 -0700

The left clicker button on my MX Master 3S popped up today. The front of the clicker is pointing up, while the back of the button remains secured in place. When I try to push the button down and pop it back into place, it appears there is an item in the way. I could press harder but I don't want to break it. Any advice? Photo here.

⟐ Commented May 22, 2023 at 10:50 MST

Logitech MX Master 3S: Logitech MX Master 3S get wet!

Thu, 02 Oct 2025 10:33:49 -0700

Logitech MX Master 3S get wet and stop working. I have disassembled few times, used electronic cleaner for all boards but no success. Charging light always red regardless how long I am charging. What to do?

⟐ Commented October 02, 2025 at 10:33 MST

Logitech MX Master 3S: Both left and right buttons malfunctioning

Fri, 06 Mar 2026 06:20:21 -0700

Less than a year after purchasing the MX Master 3S, the left button started to not register clicks (about 2/3 of the time) and shortly after, the right button followed the same issue.

I would really like to have a guide on replacing switches and the parts that fit here.

Thanks,

⟐ Commented March 06, 2026 at 6:20 MST

Logitech MX Master 3S: The rubber melts where your finger touches it.

Wed, 18 Sep 2024 07:27:33 -0700

1 year since purchase? It was about The rubber melts where your finger touches it.

⟐ Answered September 18, 2024 at 7:27 MST

Logitech MX Master 3S: Returning to computer, Bluetooth seems to have failed on the mouse.

Fri, 25 Jul 2025 14:12:54 -0700

When I returned to my computer in the morning, the mouse failed. There seems to be no Bluetooth recognition of the mouse. The battery is good. The switch for changing the configuration on the bottom alights when you change settings. When turned on, the green power light is on. Turning the mouse off, the power light goes out (as it should). I have taken it apart and cleaned out all the crap within. Reassembly worked fine and again all lights indicate a working mouse.

Is there a fix for Bluetooth?

⟐ Commented July 25, 2025 at 14:12 MST

Logitech MX Master 3S: iFixit Replacement Battery Strong Fruity Smell (Twice)

Fri, 14 Nov 2025 08:29:01 -0700

My original MX Master 3s battery was failing, so I ordered a repair kit from iFixit. When the kit arrived and I unsealed the battery, I noticed it had a very strong and somewhat unpleasant fruity smell, which the battery continued to smell like for multiple days. From doing a basic lookup, I found this can mean the battery is leaking and unsafe to use. This does seem to be true as while I couldn't see any super obvious damage, an odd dark residue had started forming outside one corner of the battery after a few days. I brought my problems up to support under the battery's warranty and I got sent a replacement, but upon opening this one up am I once again greeted by the same distinct scent as before. Is this just normal, or have I been sent bad batteries twice now?

This is a link to the kit I ordered

⟐ Edited November 14, 2025 at 8:29 MST

Logitech MX Master 3S: Mother Board problem solve

Mon, 10 Mar 2025 04:07:31 -0700

Any idea where to buy Mx 3s mother board i have to replace it

⟐ Answered March 10, 2025 at 4:07 MST

Logitech MX Master 3S: Solid Red LED with no connection to the target

Sat, 16 Nov 2024 08:35:10 -0700

My MX Master 3S always has a solid red LED on it. After every power on and off, I can see a green LED come up. Below, I can see the mouse in pairing mode, and it appears on my laptop as well. But then, after 1 minute, it turns to solid red, and I cannot see it anymore on my laptop.

Could this be a loose connection? Or does it require a battery replacement? I have a 2S and 3, all of which show that they are charging by blinking LEDs in both mice, but for my 3S, it just shows a solid red even when it is being charged. I have already charged it for 3 hours, but the same behaviour.

I have already changed my dongle to the universal bolt

⟐ Commented November 16, 2024 at 8:35 MST

Logitech MX Master 3S: Side button switches? which are used, which do you suggest?

Sun, 23 Nov 2025 11:18:19 -0700

Using the top side button as a middle mouse click, the switch is wearing down, which switch can I replace it with?

Logitech MX Master 3S: MX Master Left Click Replacement?

Fri, 14 Nov 2025 08:28:41 -0700

Using an MX Master 3s - need to fix/replace my left click switch or spring. Can someone point me towards my options? Whatever is easiest is best. I don't really want to deal with soldering, but buying a new $100 mouse also seems out of the question.

⟐ Edited November 14, 2025 at 8:28 MST

Logitech MX Master 3S: The device is un-responsive

Sat, 12 Jul 2025 14:48:04 -0700

The device become unresponsive without any pre failure notice, I have disassembled it for further check and reading is as follow

The battery charge is 4.1V

When cable is connected the battery slot shows 4.5V with the battery discounted

Even though no singe led shows sign of life, and no connection or status on the back side shows sign of connection

Any suggestions to repair

Logitech MX Master 3S: Can't get the ribbon cable in

Mon, 09 Sep 2024 14:34:44 -0700

The lock broke and I can't get the ribbon cable back in. Am I screwed? The cable came out super easy and nothing had broken. Trying to get it back in has been like wrestling an eel. The lock fell off and the ribbon cable won't slot in no matter what I do. I can get the lock back in without the cable and it stays. Can't get the cable in though.

The idea of do it yourself repairs is a nice idea, but nothing stresses me out more than ribbon cables and jst terminals.

Logitech MX Master 3S: Following the fall, all the extra buttons have stopped functioning

Wed, 20 Mar 2024 04:23:12 -0700

shift wheel mode, horizantal scroll(thumb wheel), back button, forward button, gestures not working After dropping it to the ground. Is there a solution for this?

⟐ Commented March 20, 2024 at 4:23 MST

Logitech MX Master 3S: Mouse Not Working Correctly

Thu, 24 Aug 2023 17:26:04 -0700

I accidentally dropped my mouse on a hard surface. Once turned on, the magnetic release to allow the scroll wheel to move freely doesn't work and disconnects the mouse from my computer. It also gets disconnected when I press the top button to change the scroll wheel setting. Does anyone know what the problem may be and how to fix it? TIA