Logitech M720 disassembly & microswitch repair

Replacing a microswitch on a Logitech m720 triathlon mouse, because it had started to not press sometimes and sometimes it would press on its own.
an MX510 was used as a donor for the repair, also note if you are using donors to swap the microswitches, not all microswitches sound the same, some are louder than others, so in some cases its can be beneficial to swap both left and right buttons so they sound the same.
P/N: 810-004951
M/N: M-R0062

[@jegerm6752]

Thank you so very, very much for the video! I just repaired my M720. It had been bugging me for 2 years, and I only bought it 3 years ago! The desoldering part was really hard for me, and I was sure I had damaged the PCB, but everything worked out in the end, to my pleasant surprise lol. I feel like I have a brand new mouse now! Thanks again!

[@DataCrossPuzzles]

Thank you for the mention of just cleaning the top part. When I opened mine up, I found so many little hairs and dust bunnies all over. Ended up just using compressed air and soap and water for the top part because the switch actually sounded okay (similar sound to the right-click button). Relieved that I didn't need to spend extra time soldering. Saving this video for later when the switch ultimately needs to be replaced. Thanks again!

[@doktor6495]

Thank you for the video! Maybe some hints ... If you first warm up the skids or stickers up to 40°C with e.g. a hair dryer, they will come off more easy and don't get damaged. Soldering with 390°C is little high, you could damage electronic and/or plastic parts, try it with lower temps 330 ... 350°C. Use the vacuum pump first, without using solder wick before, because the pump works better with more solder to remove! Greetings, Doc64!

[@CarlosLemans]

Thanks a lot for the tutorial, was really useful. For replacing the switches I used the microswitches RUNJRX Kailh Black GM8.0 (same used with G604 with success but for the G604 I used the reds), the Red Kailh GM4.0 works too with less sharp noise click, both works perfect and they are the best switches in the market, you can buy them in Amazon. Don't ever buy the crappy Omron.

[@lilchurro3]

I'm trying to find a broken connection somewhere in my M720, so the disassembly was really helpful to watch, as well as listening to your rationale on what parts can stay together as a unit and what parts need to be disassembled further!

[@cecilhicks]

LOL the first 32 seconds of your video is all I needed TY oh what's that? How to open it again LOL

[@johnnysong9781]

Followed this tutorial until the moment I found myself unable to get rid of the original micro-switch, way more difficult than it seems in this video, and ended up in misery with only the pin stuck in the hole unmoved not even a millimeter while the tins and the upper part of the switch detached...

[@dandy336]

Nice video! Unfortunately I don't have any donors. What micro-switch would you suggest purchasing?

[@Purkkaviritys]

there are many many different types, even when the footprint (shape,size, clickyness, loudness) are the same. they have different clickyness too. I usually just use donors so I havent bough ones in years, but a quick search rewealed that 'Kailh GM 8.0' are very popular in the mouse modding scene, so I would look into some videos on people who have used those

[@vibhavhegde7397]

Do you happen to have the circuit picture or diagram without the left microswitch? While I was doing the replacement, the solder pad came off and also I have damaged the pcb circuit on the left click side; to rebuild the trace, looking for some references. M720 - Logitech.

[@Purkkaviritys]

yeah the circuit diagrams are really hard to come by but here are some closeups of the buttons on the M720 PCB, you should be able to see the trace that you need to fix imgur.com/a/KnC6WWb

[@vibhavhegde7397]

@@Purkkaviritys Thank you, since I wasn't sure on if the problem was serious, wanted to see your thoughts; hence uploaded my images here - imgur.com/a/bQmBhBV If you can provide any feedback, that would be really helpful. I have uploaded high res images, if that helps. My problem is with left click.

[@Purkkaviritys]

@@vibhavhegde7397 well, for one you have been using too much heat when removing the old microswitch, but in the high res pictures you can see that there is enough trace left, so its possible to fix the trace, but if I were you I would do some practicing before attempting the repair on something you dont mind losing.

[@vibhavhegde7397]

@@Purkkaviritys Cant agree much!

[@jinw8974]

The mouse could have been made simpler over all.

[@yuli3873]

I just purchased mine and it has a pretty audible rattle sound when using it. Am I the only one with this problem or is it normal in this model?

[@Purkkaviritys]

if it sounds like something is loose inside the mouse, then no that is not normal.

[@shw4083]

can you please suggest what screw driver to open for M720?

[@Purkkaviritys]

I would suggest getting an iFixit kit for all basic repair needs.

[@nepane]

screwdriver size?

[@Purkkaviritys]

just get teh ifixit kit, if you plan on fixing anything else in the future it will cover all your needs.

[@DrMarvinLara]

Just put a drop or two of WD40 in the button and let it soak in a bit, clicking it, letting it move around. After some time, it will be back to working normally. This video is OVERKILL

[@Purkkaviritys]

sure, your thing will work for a while as there are multiple different was that the switch can fail, most of switch wont be fixed with some WD40, which has the main function of Water Displacement, and where the name comes from.

[@ignaciomendia4435]

@@Purkkaviritys Two months ago I did the WD40 drops and it totally fixed my problem... for about two months so if you have clicking problems just replace the switches, it's not expensive. Nice vid!