Bertote
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Yellow ligth bolt and 5A power supply

Wed Nov 16, 2016 1:09 pm

Hello people, my raspberry pi 2 b + on connecting it today, did not ascend the PWR led and got a yellow light bolt in the upper right corner of the screen, with a quick search on google, I discovered that could be the power supply. Well, I use an X300 from suptronics with a 5A power supply, as I use an HD in RPI. I thought it was a problem on the X300 and I removed it and connected the RPI through the micro usb and it had the same problem ... I tried to feed it with a computer power supply through the GPIO (4,6) and the yellow bolt stays in the corner of the And the PWR led does not turn on. The interesting thing is that apparently everything works, only this bolt that stays on the screen ... I tried an older version of the raspbian and instead of the bolt, there is a colored square.

Would anyone have any idea how to fix it?

Sorry for the bad english of the google translator...

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RaTTuS
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Re: Yellow ligth bolt and 5A power supply

Wed Nov 16, 2016 1:42 pm

your micro usb lead is rubbish
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Tinderbox (UK)
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Re: Yellow ligth bolt and 5A power supply

Wed Nov 16, 2016 1:43 pm

I had the yellow lightning bolt, I changed the microusb cable for a better quality one and that fixed my problem.

John.
Raspberry Pi 3 Model B

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Burngate
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Re: Yellow ligth bolt and 5A power supply

Wed Nov 16, 2016 5:27 pm

RaTTuS wrote:your micro usb lead is rubbish
Tinderbox (UK) wrote:... microusb cable ...
Not sure those are relevant, since the http://www.suptronics.com/xseries/x300.html has on-board supply feeding directly into the GPIO header.

However, the lightning bolt and lack of PWR LED is indicating that the 5v is below 4.86v.
If it really is low it won't hurt the Pi, and only some things won't work - such as some usb devices.

I'm going to assume that all three supply methods - X300, computer supply via the header, and micro-usb (from a wall-wart?) - can't be wrong**
Also, the first two bypass the polyfuse, so that's innocent.

What else have you connected to the Pi?
If nothing, then about the only culprit could be U4, the low-voltage detector.

** that's not a given. If you're feeding your X300 with spider's silk, and using the same from your computer supply to the header, and using a rubbish micro-usb lead, there's your problem.

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davidcoton
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Re: Yellow ligth bolt and 5A power supply

Wed Nov 16, 2016 9:15 pm

Does it work without the HD connected?
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Bertote
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Re: Yellow ligth bolt and 5A power supply

Thu Nov 17, 2016 12:32 am

Thank you all for the answer, i am sure to be connecting the sources of power correctly. The cable and power supply are good quality, 1A charger and motorola cable.
The GPIO4 voltage is at 4.96V

Special thanks to burngate
I'm going to go hunting for U4 (APX803-46SAG)

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RaTTuS
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Re: Yellow ligth bolt and 5A power supply

Thu Nov 17, 2016 8:13 am

Bertote wrote:... 1A charger an...
In my mind that is too low
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Bertote
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Re: Yellow ligth bolt and 5A power supply

Fri Nov 18, 2016 4:41 pm

RaTTuS wrote:
Bertote wrote:... 1A charger an...
In my mind that is too low
Sorry, I did not explain. I connected the charger only with the RPI, without the X300 to test if the problem was in it. No devices on USB.

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davidcoton
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Re: Yellow ligth bolt and 5A power supply

Fri Nov 18, 2016 5:04 pm

Try the command

Code: Select all

vcgencmd get_throttled
after your Pi has been running on the charger for a while. This will tell you if the supply goes under-voltage. See here for a fuller explanation.
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