MX Master 3S switch gone in 18m, MX518 lives!

moh1t · December 30, 2025, 3:57pm

MX master 3s’ left switch is only working 1/3 times. While I figure out the fix, found a really old MX518 in a closet and it works beautifully, I bought it in 2008!! the 3s was bought 18m back while an almost 18 year old device works perfectly

For 3S going to try WD40 first and then try and replace the switch. Any idea where I can get a replacement kailh mute/silent switch?

Reference - https://www.reddit.com/r/logitech/s/Tfywrnx649

rr9 · December 30, 2025, 4:06pm

@HonestLiar provides services to replace the buttons with much better ones.

shrimann · December 30, 2025, 4:08pm

alpha5555 · December 30, 2025, 5:20pm

Any idea about how much would it cost approximately to repair or fix this mouse?

Heisen · December 30, 2025, 5:28pm

MX518 is the GOAT.

captivating · December 30, 2025, 5:37pm

How much for mx518

shrimann · December 30, 2025, 7:20pm

Tbh, its fairly easy, you just need to desolder the old switch and resolder the new switch. You can ask any local technician to do it if you dont know soldering. The switch cost 50 each so 100 for the switch 50-100 for shipping and 50 for the technician.