Logitech MX Master 2S

Logitech MX Master 2S with mechanically broken right mouse button.

This mouse can be paired with up to 3 receivers, either Unifying or Bluetooth. According to specification Bluetooth LE is required for second option.

Internal Li-Ion accumulator, charged with micro USB.

Two visible T5 screws and four Philips screws hidden under feet. Hooks on left and bottom sides, but easy to open.

"Hidden PCB" for button hidden in thumb reast.

500 mAh battery. Three leds with light pipes on left side indicate charge level. Operation time on single charge is specified as 70 days. Swappable (short instruction is included by manufacturer, though T5 Torx screws are not exactly user friendly) and and as it is not crammed can be probably swapped for third party higher capacity cell.

Very weird: there was extra screw stuck under battery holder screw. I don't think this was the cause of failure though as there seems to be extra space in this area. I'm pretty sure no one opened it before, so it must be manufacturing fault.

nRF 51802 - from Nordic site: general purpose, ultra-low power SoC ideally suited for Bluetooth® Low Energy and 2.4 GHz proprietary wireless applications. It is built around the 32-bit ARM® Cortex™-M0 CPU with 256 KB flash + 16 KB RAM. The flexible 2.4 GHz radio supports Bluetooth Low Energy and 2.4 GHz proprietary protocols, such as Gazell.

It incorporates a rich selection of analog and digital peripherals that can interact directly without CPU intervention through the Programmable Peripheral Interconnect (PPI) system. Flexible GPIOs enables you to connect digital interfaces like SPI Master/slave, TWI Master and UART to any of the 31 GPIOs on the device.

The nRF51802 is a low cost variant of the nRF51822, it has the same functionality, but has minor performance degradation in terms of:

• 2 dB less RX sensitivity
• Slightly higher RX and TX peak currents

BQ24040 LiIon charger

Pixart PMW3816DM sensor. Up to 4000 dpi according to specification and working on glass surfaces.

Motor has semicircular element on the shaft. After rotating it other plastic element is moved and mouse wheel is either freed or is resisting.

Broken right mouse button. I've used some epoxy glue and also heated this element with hot air (at 130 C) to adjust its shape/position.

There is also missing metal spring from the same button (probably lost at the same time button was broken). This changes the click feel, but still seems acceptable.

Hidden button (described as intended for gestures):

After repair: