Help identify the components and functioning of this PCB

[daslolo]

This PCB has a few components which marking have been purposely scraped out.
Could anyone help identify the functioning of this thing?

It's the main PCB of an Eachine ev200d FPV goggles. It can be fitted with 2 diversity receivers (2x rx5808 each) and something switched between the 4 signals to the one with the highest RSSI. That switching usually happens on the module, between two rx5808, these goggles do this between 2 modules and I think the switching happens on the main board.

[Nusa]

The main board one is probably a microprocessor. Map out power and grounds and a few obvious functions and you might be able to narrow it down.

For the scrubbed shields, the obvious thing is to open the can and see what's in there. At your own risk, of course.