I have a custom system with C7SIM-Q, the system does not power on all the time, I use the multimeter to check the power connector, it shows the standby power is less than 5V, and I tried another power supply which has steady 5V and the system powers on, what could happen?
The board needs to have steady 5V stand by power to power on, please double check with your power supply manufacturer for more info; in the mean time we suggest you to use the PSU that has been tested.