This is a Xilinx XCKU5P FPGA in the FFVB676 package. It's the only part of 10 that I got from a few Aliexpress sellers for cheap that didn't work. This one appears to have been overheated in a reballing attempt. The substrate is delaminated as can be seen in the cross section.
14 layer HDI PCB. It's built as a 2 layer 1 mm thick board with 6 plies of resin clad copper (no fiberglass) laminated on. This probably went in a lamination press 6 times with laser vias, plating and etching in between.
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