Logitech G400S Clicking Issues (only left click) - Page 1
Forum section: electronics / repair

author: Fried Chicken
author_rank: Regular Contributor
timestamp: August 10, 2025, 10:35:58 am
content: Switch, capacitor, orpull up resistor?It failed after I got back from vacation. I've pulled it apart before, and it can't hurt to do so again to clean everything out.Here's a view of the PCB I was able to find from a youtube teardown (unfortunately only the top side).

author: Haenk
author_rank: Super Contributor
timestamp: August 10, 2025, 10:47:35 am
content: What good for is a random image? That's completely pointless.It's like "My Dogdge broke down, can you help me? Here is a picture of a similar vehicle.".The switch might be broken, the mechanical part pressing the switch might be broken, solder joints might be broken, PCB might be broken, the mechanics might be completely filled with junk and dust and prevent pressing the key.All these things are easy to check - for *you* and we are no help for that task, when all we have is a random picture.

author: Fried Chicken
author_rank: Regular Contributor
timestamp: August 10, 2025, 11:03:51 am
content: Quote from: Haenk on August 10, 2025, 10:47:35 amAh the refreshingly German sentiment; just landed back in the States from Germany. Reminds me of vacation!I haven't torn the mouse down yet because... I need it/I'm using it. I've gone ahead and started this thread in preparation for the repair; part of the preparation included a video on disassembling and cleaning the mouse. While it was conveniently in front of me, I decided to include a screenshot of the PCB in question. It's not a schematic, it's not a photo of my actual PCB, it's not high resolution, and neither did I include it iwth the expectation of it being a useful diagnostic tool. It serves as 1. a sort of reference, and 2. pictures are nice.Vielen Dank!

author: amyk
author_rank: Super Contributor
timestamp: August 10, 2025, 11:08:16 am
content: Almost certainly the switch; check with a DMM. Vigorous actuation accompanied with a spray of contact cleaner may fix it, but otherwise replacement switches are not expensive.

author: RoGeorge
author_rank: Super Contributor
timestamp: August 10, 2025, 11:29:45 am
content: Too much video gaming!Usually it's the switch. Either replace the switch with some other switch taken from a sacrificial mouse, or swap the left button switch with some other switch you don't need (if there is any switch you don't use from your G400).

author: coromonadalix
author_rank: Super Contributor
timestamp: August 10, 2025, 11:33:20 am
content: some logitech are known for switch failures, replace them

author: Psi
author_rank: Super Contributor
timestamp: August 10, 2025, 11:39:20 am
content: Common issue, they used crappy switches that cannot handle such low current.Replace them with the proper version of the switch (made in Japan).

author: Fried Chicken
author_rank: Regular Contributor
timestamp: August 10, 2025, 11:52:03 am
content: I'll check with the DMM and replace the switches. I really like this mouse.

author: BennoG
author_rank: Frequent Contributor
timestamp: August 10, 2025, 12:11:22 pm
content: Quote from: Psi on August 10, 2025, 11:39:20 amI use the blow ones but they also fail af ter 1 or 2 years.https://www.tme.eu/nl/details/d2f-01f/microschakelaars-snap-action/omron-electronic-components/Can you give a link to the correct ones.Benno

author: Fried Chicken
author_rank: Regular Contributor
timestamp: August 10, 2025, 02:05:55 pm
content: Quote from: BennoG on August 10, 2025, 12:11:22 pmI to would very much appreciate this

author: Fried Chicken
author_rank: Regular Contributor
timestamp: August 10, 2025, 08:41:04 pm
content: Update: the mouse fixed itself. Maybe it enjoyed vacation too much and didn't want to get back to work.

author: Haenk
author_rank: Super Contributor
timestamp: August 11, 2025, 05:53:48 am
content: Quote from: Fried Chicken on August 10, 2025, 11:03:51 amYou are welcome.And: I gave you several things to check. Again, posting some random image is completely useless to fault finding of *any* device.

author: Psi
author_rank: Super Contributor
timestamp: August 12, 2025, 06:13:17 am
content: Quote from: BennoG on August 10, 2025, 12:11:22 pmSorry I dont have a link any more, it seems to have been on my old digikey account.All I remember is that the same part number is being made in two locations and you want the one made in Japan.