This is the least that microsoft can do after they produced such a stupid dongle. Where one can find circuitry documentation of the dongle. USB dongle is coded to work with just your device, so a replacement is not possible to get. The frequency between the receiver and device are matched.
And then we talk about care for the nature and green transition! We have two more similar sets of Wireless Sculpt Comfort Desktop USB Keyboard and Mouse Bundle and we plan to open one of the healthy dongles and to measure the broken element which will cost some cents and then change the broken capacitor and fix the other lane damage that is obvious. The Microsoft keyboard and USB dongle are paired and will only work with each other, so the dongles are unique and come as a set. The problem is that Microsoft not only does not provide spare universal dongle, but does not provide any technical documentation of dongle PCB circuitry from where one can see what are the parts and connections and find a way to Fix on their own.
All other damage is pretty common to fix - just repairing some lead tracks and connections.
He observed it and said that there is a broken capacitor which makes it difficult to be measured and from there to be determined and ordered. So I opened it and took the PCB to a microelectronics technician. Since the dongle stretches a "meter and half" from the USB port it is not so uncommon one to forget and flex it to breakage when moving the PC.
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