Hello Darwin,
I have made the measurement for the WDI, the signal is correct, that means that the value is always at 0 until the first rising edge done at 120ms by the CPU software.
There is no unintentionnal move of the WDI during the power up sequence. (pull-down to GND in the schematic as you can see).
Do you have an idea on how I could make such screenshot in the NOK case with the TPS chip?
thanks for your support.