Rise time in this context is the time your PSU needs to reach a certain voltage level.
There is an undervoltage lockout on the PMIC that will activate at 4.1V, forcing the STANDBY state, which incidentally cuts off VBUS as well. This is intended to prevent boot looping or cycling VBUS on/off if a weak PSU is used.
With a slow rise time, the undervoltage lockout (UVLO; (critical window is the rise from ~3.5V to 4.1V)) will operate because the time spent with the PMIC powered but below the critical threshold exceeds the UVLO debounce time (with the debounce time not known to me/not specified).
Is the red LED on when you've supplied power your the Pi5? Have you pushed the button? Will it boot or not?
As you're saying that you also don't have any boot diagnostics screen my summary would be: RIP little Pi5.
Btw: 5.1V input voltage is fine. That's what the official PSU is providing as well.
There is an undervoltage lockout on the PMIC that will activate at 4.1V, forcing the STANDBY state, which incidentally cuts off VBUS as well. This is intended to prevent boot looping or cycling VBUS on/off if a weak PSU is used.
With a slow rise time, the undervoltage lockout (UVLO; (critical window is the rise from ~3.5V to 4.1V)) will operate because the time spent with the PMIC powered but below the critical threshold exceeds the UVLO debounce time (with the debounce time not known to me/not specified).
Is the red LED on when you've supplied power your the Pi5? Have you pushed the button? Will it boot or not?
As you're saying that you also don't have any boot diagnostics screen my summary would be: RIP little Pi5.
Btw: 5.1V input voltage is fine. That's what the official PSU is providing as well.
Statistics: Posted by aBUGSworstnightmare — Tue Jul 16, 2024 6:06 am