Question:
If the GPU is second hand that means that the GPU was once working - correct?
As I understand it all, chips do not simply go missing.....
So the "missing" chip was either never there (not needed) or was, for some reason, removed.
Where did you get the 3090 fe?
What source/site did you use to discover the chip numbers (220 and 2a49D)?
More information needed.