If the Lightning bolt is displayed, the red PWR LED should be off. If the red LED is on, there should be no lightning bolt. So I'm confused.
Yes. Phone chargers really don't cut the mustard.Should I try to get another power supply?
One of the chargers has a fixed lead, changed the lead with the other one with the same result.jamesh wrote:Dodgy USB power lead?
Could this happen even when PP8 is at 3.37V? (I am following viewtopic.php?f=28&t=89522)drgeoff wrote: Looks like the 3.3 volts regulator is faulty or its load is drawing excessive current.
Sure, I'll try and get a better supply.Burngate wrote:Yes. Phone chargers really don't cut the mustard.
Could this be a problem with the Pi's brownout detection circuit?mahjongg wrote: The lightening bolt is displayed even when the dips below 4.6V are very short, too short to see with the RED LED, its exactly why the PI doesn't rely on only the power LED.
There are 2 potential problems when using a phone charger as a power supply.
That's odd, I get the rainbow screen with both. But it could be your monitor is not turning on fast enough (I have one older monitor that does not show the rainbow GPU test because it is slow to turn on the screen when it gets a signal).
If PP8 is at 3.3v then the regulator probably isn't faulty.
It's not a fault - it's how it's supposed to work!Could this be a problem with the Pi's brownout detection circuit?mahjongg wrote: The lightening bolt is displayed even when the dips below 4.6V are very short, too short to see with the RED LED, its exactly why the PI doesn't rely on only the power LED.
The rainbow screen - four pixels blown up to fill most of the screen - is created by the first bit of the boot sequence, Bootcode.bin if I remember correctly.One thing I noticed, when working with an SD card with NOOBS, I get the rainbow screen. With an SD card with a Raspbian image, I get nothing at all on the display.
I was aware of that possibility, so did the same cycle once more with the new supply (format, flash, verify). Everything is same (rainbow screen with lightening bolt). I also tried with the last image that booted successfully on this board (Jessie), to have the same effect.pcmanbob wrote: Now you have the proper power supply, try flashing a new copy of raspbian on to your SD card, and use that to test your pi.
with a bad power supply its possible if not probable that your SD card is corrupt caused by the repeated low voltage.
The brownout circuit does not stop the Pi from booting all it does is indicated that there is a problem with the supplied voltage via the RED LED and the on screen flash icon.Is there a way to circumvent the brownout detection circuit? (As a last resort..)
If your card that works in the 3B has an OS that you downloaded before the 3B+ was released then it will not work in a 3B+.MiffPi wrote: ↑Wed Sep 11, 2019 8:22 amHave you ever figured this out?
My co-worker ordered a kit and had this problem with 2 different model B 3+.
My Model B 3 works perfectly fine.
I have tried several power supply's, re-formatted the SD Card, tried putting in my SD Card (works great on my Pi), but nothing seems to work.
Thank you in advance! Any help on this is much appreciated!