Thanks very much.
I notice that the pin numbering is clockwise. Strange ...
BTW, SYT664 (marking BJRxyz) seems to match the pinout of the BPKxyz chip on this SSD:
https://tpucdn.com/ssd-specs/images/d/1266-pcb-back.jpgDo you have any idea which IC that could be?
Or what about the "41853" Chip? I suspect that this could be a quad PSU supervisor IC.