(More) Power Problems - Inrush Current too high

[gambino37]

I think I'm actually good now. I separated the two. I now have the pi 3b+ getting power directly from Helder's PSU and on the second set of pads the Tinkerboy V3. I haven't had a lightning bolt since. It seemed having the power route all the way through the V3 and DPI adapter was the problem. Something is still fishy with the V3. The 5V pads on that board fluctuate and are not 5V constantly. One thing is for sure though, Helder's PSU is a beast and I doubt I will ever buy another Powerboost. (Well maybe I will, it still has all the pretty lights on it)

[infinitLoop]

i dug out the bw screen variant i had in mine and swapped it for a gearbest, and mine started working too. so, it looks like that was where my main issue was. just to be safe, i did also wire the pi into the psu on its own, and powered the tb board from the pi. it sucks though that the screen board takes up a bit more space, so everything is a bit too tight... so, my plan is to give an spi screen a try... just have to wait on aliexpress now

[Helder]

So his DPI board is the issue? Very likely the backlight circuit is the culprit. Maybe it needs a redesign with a better backlight driver.

[tinkerBOY]

Does Tinkerboy have any insight on this? Power issues seem to be creeping up as a common theme with the V3 boards. Probably something he should look in to. He is super good about communication on things like this.

Sorry it’s been a bit while since I browse this forum. Let me try again to measure the current usage of my v3 and dpi adapter. I’ll be back.

UPDATE:

Here are the measurements i made just now which is always the same as before when I started selling these boards:

• DPI Adapter v1.1/v1.1 - around 160mA

• tinkerBOY Controller V3.0 - around 130mA with a 4ohm speaker

[tinkerBOY]

I think I'm actually good now. I separated the two. I now have the pi 3b+ getting power directly from Helder's PSU and on the second set of pads the Tinkerboy V3. I haven't had a lightning bolt since. It seemed having the power route all the way through the V3 and DPI adapter was the problem. Something is still fishy with the V3. The 5V pads on that board fluctuate and are not 5V constantly. One thing is for sure though, Helder's PSU is a beast and I doubt I will ever buy another Powerboost. (Well maybe I will, it still has all the pretty lights on it)

The 5v output has nothing to do with the V3 since it's just a controller board and it's not or does not include any boost/power circuit . The voltage you measure on any of the 5v pads (whether it's stable or not) on the v3 is the result or output voltage of any power supply you connect to it.