🧩 MacBook Pro A2251 (820-01949) – Finding correct OTP CD3217 placement for 20V negotiation
Hello,
I’m repairing a MacBook Pro A2251, board 820-01949, and I’m currently stuck at the USB-C power negotiation step. The board pulls 5V / 0.15A, but never requests 20V from the USB-C charger.

🧠 Context:
All four CD3217 chips (U3100_W, X, R, T) were previously desoldered. I kept the four original chips (all labeled CD3217B12 13POVCS) but did not note their original positions.
I have now resoldered only two CD3217s:
  • U3100_W
  • U3100_R
U3100_X and U3100_T are empty (X pads...