What is that element on smartphone pcb and what it does?
Texto:
I have XZ1 Compact and have questions regarding a particular elements (see screenshot)
https://i.imgur.com/FNbXVHF.png
I have three questions:
What this element is for under "12-25" number on the PCB?
Why on the phone back plate the glass, underneath where "12-25" element is located, is darkened? Is it some kind of polarization?
What will happen if that darkened layer is wiped out and becomes transparent, what it will affect?
Thank you