Thanks for the detailed reply.

I tried all the steps mentioned.
Disconnected and reconnected hashboard cables, tried swapping them out with cable from a working miner, but no change.
I then swapped out the control board with one from a working s17+ and flashed s17e firmware on it, still nothing.
Even tried swapping out the psu but no change.

Running out of ideas. Normally at this point i'd send it to bitmain hong kong site for repair, but this is a replacement unit with mixed hashboards and no serial number on the body, so i doubt they will even repair it. I wish they gave some warranty on the repair units....