Further to the suggestions above, J100 and J104 both need to be set to the 'external' clock position (pins 2-3, closest to the 200-pin CPU socket) to operate the A3640 CPU board, not internal.
Diagnosing something like this is a bit more complex because you have many unknowns around possible soldering issues, possible component placement issues, possible defective components. I've no idea if these replica PCBs have been ordered with full testing or not, so an etching fault is another possibility.
To begin with, I wrote some information on debugging low level start-up issues on an A3000 in this recent thread:
https://forum.amiga.org/index.php?topic=77137.msg862992#msg862992That will quickly tell you what basic aspects of the system are alive or not. The fundamental design of the A4000 is mostly the same as the A3000, so most of the same debugging detail applies. If the CPU is mostly alive and reading ROM data correctly, and without any chip memory SIMM installed, the system should show a bright green screen quickly after power on.
If you can provide another photo showing the jumper locations, it would be worth a quick sanity check of those. Else you can compare them against an existing working board.
