MX Master 3S Won't Power On with New 3.7V Battery - No LEDs or Charging Light

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Logitech MX Master 3S

Tutoriel de réparation, informations de démontage et de diagnostic pour la souris sans fil Logitech MX Master 3S. Commercialisée en 2022, elle s'identifie par le numéro de modèle MR0077.

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Zaid Safadi @zaidsafadi

Rep: 25

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Publié: 22 juin 2026

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MX Master 3S Won't Power On with New 3.7V Battery - No LEDs or Charging Light

My Logitech MX Master 3S randomly shut down and won't turn back on. I found the original battery was depleted to 0.5V. I replaced it with a new battery which is outputting 3.7V, but the mouse still shows no signs of life—no LEDs turn on even when plugged into a USB-C charger. I have verified that the interconnect ribbon cable and battery connector are seated correctly.

I have a multimeter and would like help identifying potential blown SMD fuses, bad voltage rail test points, or common failure points on the motherboard that would cause a total power failure despite having a good battery voltage.

I've attached high-resolution photos of the motherboard (front and back) and the USB-C daughterboard. Any guidance on where to probe would be greatly appreciated!

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1 commentaire:

I had similar symptoms. Replaced the battery with no improvement. Looked closer and found evidence of overheating near the 10UH (block with "100").

26 juin 2026 par ryanhn

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I had similar symptoms. Replaced the battery with no improvement. Looked closer and found evidence of overheating near the 10UH (block with "100"). — ryanhn

TeeJay Sim @teejaysim Rep: 13 2 · Answer 1 · 2026-06-24T02:48:24-07:00

TeeJay Sim @teejaysim

Rep: 13

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Publié: 24 juin 2026

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I have a similar issue. In my case, the 10UH 100(the small block written "100") power inductor is broken, and the contact pads underneath are ripped. It might be that inductor that is faulty. Try testing it

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Hey, sorry for the late response as was a bit out of town and left the entire gear at home. Tomorrow i will conduct a test and check if the inductor is broken or dead. I will reply with results after doing my testing.

4 juil. 2026 par Zaid Safadi

So after checking the inductor, i still found nothing at all, i doubled checked it and still, it seems that it is operating as intended. I checked through the continuity test which beeped indicating that it is not destroyed internally. I decided to contact a professional game repair shop so they could attempt and repair it. I have told them what i have discovered and attempted to do, but since the lack of skill + experience, i couldn't repair it. They told me that they will take a look at my attempt and check why i couldn't self repair it. I will keep you updated!

6 juil. 2026 par Zaid Safadi

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Logitech MX Master 3S

MX Master 3S Won't Power On with New 3.7V Battery - No LEDs or Charging Light

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