Thanks. Good to know. But it is not the case for me that the rise-time is slow. I checked with scope again and applied power through a switch so that it is instant. There is also no drop below any brown-out level.
if the rise-time on the 5v rail is too slow, or if the 5v rail dips too low, the PMIC will enter a shutdown state
that will turn off all rails and revert to just a red led
pushing the power button will turn it on, but if the 5v rail dips low again, it will just shutdown again
The PMIC on my board is now still completely dead.
This means that on the two RPi 5's I have had so far, the following fail states have been observed:
* Constant red light and hot PMIC, no function.
* HDMI 0 not producing any image.
* Three long green flashes + three short = "I2C error". All(?) rails from PMIC ok. Hot CPU and PMIC.
* Constant red light, all(?) PMIC rails off, no heat, no function.
Unless any RPi engineer can get me any more info of the kind I have requested, I will probably have to request another Pi from the supplier. (Which would be a shame since it is not the suppliers fault and I am still interested in finding the root cause to the problem.)
Or do anyone here still believe that I am responsible for the failures and it is not a problem with the Pi 5's themselves?
Statistics: Posted by sm6vfz — Sat Aug 03, 2024 2:46 pm