Help with Keyboard PCB

[Dandi]

Hi

I recently bought a Rapoo v780s keyboard. since it was an online purchase I couldn’t test the keyboard and later I found out that the ESC key was not working. I can’t send the keyboard back.

At first, I thought it was the mechanical switch but after opening it up I found out the problem was because of a missing component on the board. Rapoo does not use conventional mechanical switches such as Cherry mx or Gateron and uses its proprietary technology.

I attached the images, I guess that the keys work by forming a magnetic field when the rod inside the switch is lowered but I’m not sure. Under all the keys are two (maybe) capacitors but as you can see the ESC key is missing one.

I guess that the missing piece is a capacitor but I’m not sure what kind.

Please help me find this component.

 

[Dandi]

Continued

 

[kellys_eye]

The 'key' just breaks an optical path between the IR transmitter and the receiver (marked CE). There is no magnet or anything else in there.

Clearly there is a bit missing (manufacturing error) but the easiest way to fix it would be to remove an identical part from another key that isn't likely to be used (or missed) during normal operation (ALT GR perhaps - i.e. one to the right of the space bar?).

This will require soldering and observing the polarity of the replaced part else it won't work.

Sure the missing bit isn't inside the keyboard case somewhere?

 

[Harald Kapp]

Sure the missing bit isn't inside the keyboard case somewhere?

Doesn't look like a "forgotten" component, rather a dislodged one. The pads look as if they had been soldered.