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Did you follow all the steps in DFU tutorial?
If you can't enter DFU, there is a problem with T2, its communication with U3200, or USB-C lines.
Supposing all AWAKE and SLPS2R (T2 power lines) voltages are good.
o.k, i was lift U3200 and U3100 and under both of the was corrosion! so i was clean and replaced(from donor board) now i get 20v but A puls from 0.03-0.00 and with battery is 20v a0.3-a0.0