(More) Power Problems - Inrush Current too high
Posted: Sun Mar 24, 2019 6:39 pm
I was trying to re-do the power on my 3a+ build, and now I'm stuck with this problem where it won't power up when powered through the power supply, but everything will power up if plugged into the pi directly, and will keep running on the power supply when you unplug the pi power.
I had been using Helder's Retro PSU successfully with it, and was switching to a different one while re-doing and adjusting the build, but ran into this boot-up problem. I thought that the new PSU couldn't handle the current, so I switched back to using the Helder one, and still can't get it to power up from the power supply. Once I prime it, or whatever, with 5v from the pi power, it works though. I had 2 Helder PSUs and tried both, with the same issue.
I'm using the Tinkerboy v3 for everything except the screen, which is a BW model with a 5v mod. The screen and pi power through that board. I also have some button leds and a fan that are powered at the 5v from the power supply, in a strip that the aio board also connected to, so everything is basically sharing the 5v, and multimeter tests all look good. The leds have a switch to turn them off, and i have tried disconnecting the fan, but even having both those out of the picture, the pi still will not start from the PSU. When I disconnect the board/pi/screen and just use the PSU to power the leds and fan, they work, and those also work fine when i do the "5v prime" from the pi.
i'll try and describe it simply:
battery -> PSU -> fan
-------------------> switch -> LEDs
-------------------> Tinkeryboy v3 -> Pi 3a+
----------------------------------------> Screen
----------------------------------------> Ext USB port
switch for on/off goes to "en" on the PSU for the Helder setup, and I also have the ADC connected, but I tried without it as well just to check (no difference)
any ideas or anything I could look into to fix it? I thought a resistor/capacitor combo to delay the boot of the pi might help, but it didn't seem to (although it's likely I just didn't do it the right way if that is something that might work).
i can try and post pictures, but a lot of stuff is too obscured to be much help. i could show the power supply wiring at least, but there's not really a lot to that (even the basic, battery in, 5v out just to the board didn't work). like i said, though, it works fine when starting at the pi, so I think it's current/draw related, not the wiring, but I definitely could be wrong. I'm just not sure what I can do to fix it.
thanks
I had been using Helder's Retro PSU successfully with it, and was switching to a different one while re-doing and adjusting the build, but ran into this boot-up problem. I thought that the new PSU couldn't handle the current, so I switched back to using the Helder one, and still can't get it to power up from the power supply. Once I prime it, or whatever, with 5v from the pi power, it works though. I had 2 Helder PSUs and tried both, with the same issue.
I'm using the Tinkerboy v3 for everything except the screen, which is a BW model with a 5v mod. The screen and pi power through that board. I also have some button leds and a fan that are powered at the 5v from the power supply, in a strip that the aio board also connected to, so everything is basically sharing the 5v, and multimeter tests all look good. The leds have a switch to turn them off, and i have tried disconnecting the fan, but even having both those out of the picture, the pi still will not start from the PSU. When I disconnect the board/pi/screen and just use the PSU to power the leds and fan, they work, and those also work fine when i do the "5v prime" from the pi.
i'll try and describe it simply:
battery -> PSU -> fan
-------------------> switch -> LEDs
-------------------> Tinkeryboy v3 -> Pi 3a+
----------------------------------------> Screen
----------------------------------------> Ext USB port
switch for on/off goes to "en" on the PSU for the Helder setup, and I also have the ADC connected, but I tried without it as well just to check (no difference)
any ideas or anything I could look into to fix it? I thought a resistor/capacitor combo to delay the boot of the pi might help, but it didn't seem to (although it's likely I just didn't do it the right way if that is something that might work).
i can try and post pictures, but a lot of stuff is too obscured to be much help. i could show the power supply wiring at least, but there's not really a lot to that (even the basic, battery in, 5v out just to the board didn't work). like i said, though, it works fine when starting at the pi, so I think it's current/draw related, not the wiring, but I definitely could be wrong. I'm just not sure what I can do to fix it.
thanks