Hi,
I'm currently trying to repair a keyboard after a spillage, that is giving me pretty random crosstalk between keys.
I noticed what appeared to be a potentially damaged ferrite bead on the pcb. This leads me to the question:
What purpose do ferrite beads have in a digital circuit?
I read that their main use is things like radio applications or other things involving high frequencies to avoid EMI. I also read that they are used when powering an analog and digital circuit from the same power source. This might be the case here, as the keyboard also has audio jacks, but this doesn't fit its location on the pcb.
Would it be necessary to clean up the power source?
And could a broken ferrite bead in a keyboard pcb lead to this kind of strange behaviour?
In case it helps, I'll include a picture of the pcb with the ferrite bead marked in red, the circuitry from the audio jacks to the very left and the rest being hooked up to the LEDs and membranes
Thanks in advance!