Liamza2314
Posts: 11
Joined: Mon Feb 08, 2016 1:39 pm

Pls help, cant boot my pi or run any operating systems

Mon Jan 22, 2018 10:21 am

Hi, I have a Raspberry Pi 2B and it's been running smoothly with Raspbian (apologies i dont remember the disto, I think it was Jessie) and Kodi installed in my sister's room as a media center, all of a sudden when I boot it, I get constant undervoltage warnings, strange noises over composite and a shutdown. I took it to my room, installed OSMC, plugged it into my monitor through a low power hdmi to vga adapter, but low and behold, undervoltage and shutdown. I tried it with 4 different Micro usb cables in many different sockets around the house, including my laptop, but the red light cant stay on for very long and i get the undervoltage and shutdown. I also tried retropie but the same issue. I have had undervoltage warnings for a long time but it has always sorta dissapeared eventually and allowed me to keep using it. I have never overclocked my pi and never used it for more than kodi and occasionally broadcasting radio

Please help as I really want to use RaspAnd as the whole reason I got the pi initially was to install android on it when a usable version arose

Thanks in advance

-Liam

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RaTTuS
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Location: North West UK

Re: Pls help, cant boot my pi or run any operating systems

Mon Jan 22, 2018 10:30 am

viewtopic.php?f=28&t=58151 will cover everything you need,
what else has been plugged into it?
does the CPU chip get hot to the touch ?
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pcmanbob
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Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: Pls help, cant boot my pi or run any operating systems

Mon Jan 22, 2018 12:04 pm

If you are getting under voltage warnings and you have tried different USB cables, have you tried a different PSU ?

its not unknown for them to fail especially if its a cheap psu designed for charging phones.
Remember we want information.......................no information no help
The use of crystal balls & mind reading is not supported

Liamza2314
Posts: 11
Joined: Mon Feb 08, 2016 1:39 pm

Re: Pls help, cant boot my pi or run any operating systems

Tue Jan 23, 2018 8:59 am

RaTTuS wrote:
Mon Jan 22, 2018 10:30 am
viewtopic.php?f=28&t=58151 will cover everything you need,
what else has been plugged into it?
does the CPU chip get hot to the touch ?
Nothing besides a flash drive and a keyboard for controlling kodi, and the chip gets slightly warm but not too hectic

Liamza2314
Posts: 11
Joined: Mon Feb 08, 2016 1:39 pm

Re: Pls help, cant boot my pi or run any operating systems

Tue Jan 23, 2018 9:00 am

pcmanbob wrote:
Mon Jan 22, 2018 12:04 pm
If you are getting under voltage warnings and you have tried different USB cables, have you tried a different PSU ?

its not unknown for them to fail especially if its a cheap psu designed for charging phones.
yeah, i swapped out the psu a couple times to no avail

pcmanbob
Posts: 4465
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: Pls help, cant boot my pi or run any operating systems

Tue Jan 23, 2018 10:35 am

Have you tried measuring the voltage on the 5v pin that's on the gpio header while your pi is booting , if you say the red LED is still going out even after changing the psu several times that would be my next suggestion.
Remember we want information.......................no information no help
The use of crystal balls & mind reading is not supported

Liamza2314
Posts: 11
Joined: Mon Feb 08, 2016 1:39 pm

Re: Pls help, cant boot my pi or run any operating systems

Tue Jan 23, 2018 1:11 pm

pcmanbob wrote:
Tue Jan 23, 2018 10:35 am
Have you tried measuring the voltage on the 5v pin that's on the gpio header while your pi is booting , if you say the red LED is still going out even after changing the psu several times that would be my next suggestion.
Lmao sorry, I'm more of a software guy, how would i go about doing that?

Also as a side note, I've heard of undervoltage corrupting sdcards, I doubt this is the issue as I've reformatted my card quite a few times, however I will try a new card if i can get my hands on one

pcmanbob
Posts: 4465
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: Pls help, cant boot my pi or run any operating systems

Tue Jan 23, 2018 2:40 pm

First you need a digital volt meter , set to a DC voltage range of 0-20v a hobbyist meter like this will be fine.

Image

then you need to connect the leads of the meter to these 2 pins on the pi

Image

Now you can try and do it connecting the lead directly to the pins but I don't advise it as you can easily short out adjacent pins
so I recommend you use 2 dupont wires to connect to the pi gpio pins and then connect your meter to the dupont wires.

Image

now ideally you want a voltage of 5 - 5.1V showing on the meter with the pi booting. in this example I am boot my pi3B using a 5V 2A switch mode power supply and as you can see I have a voltage of 5.055V which is just about perfect.
Remember we want information.......................no information no help
The use of crystal balls & mind reading is not supported

Liamza2314
Posts: 11
Joined: Mon Feb 08, 2016 1:39 pm

Re: Pls help, cant boot my pi or run any operating systems

Tue Jan 23, 2018 11:22 pm

pcmanbob wrote:
Tue Jan 23, 2018 2:40 pm
First you need a digital volt meter , set to a DC voltage range of 0-20v a hobbyist meter like this will be fine.

Image

then you need to connect the leads of the meter to these 2 pins on the pi

Image

Now you can try and do it connecting the lead directly to the pins but I don't advise it as you can easily short out adjacent pins
so I recommend you use 2 dupont wires to connect to the pi gpio pins and then connect your meter to the dupont wires.

Image

now ideally you want a voltage of 5 - 5.1V showing on the meter with the pi booting. in this example I am boot my pi3B using a 5V 2A switch mode power supply and as you can see I have a voltage of 5.055V which is just about perfect.
I'll do my best to obtain such a device, thank you

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