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Repair guide, disassembly, and troubleshooting information for the Logitech MX Master 3S wireless mouse. Released in 2022 and identified by model number MR0077.

The device is un-responsive

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

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I've got same problem
I am able to see the IR light working but not any sign of life either

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I've contacted Logitech Support, the only thing they can give is a 20% coupon...
My mice is not under warranty, bought mid-2023, died Q1 2026
With all the respect, it's pretty shameful, a perfectly working mice dying suddenly like this..

Please help us !

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i just read another post that indicated the 3s has a known MB issue - which I didnt know about. If nothing works, that may be the problem.

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Ali Salah zal eeuwig dankbaar zijn.
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