gfucka
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Raspberry pi b+ no led no power

Tue Sep 13, 2016 7:07 am

Hi I have a Raspberry Pi Model B+. I use it for more than year with Kodi and all work fine.
Yesterday it not start, and no led go on (red and green).
I think it is power supply but I try with my phone power supply 5v 700mA and no led no booting, than I try with the TV usb 5v 5A and no changed.
It is my raspberry die?? I read about a polyfuse f3 problems in this case but my raaspberry not have f3 I find just an f1...

Please help me
Thankyou

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nl3prc
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Re: Raspberry pi b+ no led no power

Tue Sep 13, 2016 10:08 am

test voltage with multimeter
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gfucka
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Re: Raspberry pi b+ no led no power

Tue Sep 13, 2016 10:25 am

Hi and thank you for answer. What I test? The 5 volt and 3v3??

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nl3prc
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Re: Raspberry pi b+ no led no power

Tue Sep 13, 2016 11:20 am

Check with ohms meter if the fuse f1 still oke the outcom must be close to zero
you kan also check if both sides are at aprox 5 volts if one of the sides don't cary any volts the fuse is broken
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gfucka
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Re: Raspberry pi b+ no led no power

Tue Sep 13, 2016 12:33 pm

Ok in the evening I do this test.
But if I verify the f1 is broken, how I can replace it?
Where I can buy another similar polyfuse??
Thank you

klricks
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Re: Raspberry pi b+ no led no power

Tue Sep 13, 2016 1:07 pm

gfucka wrote:Ok in the evening I do this test.
But if I verify the f1 is broken, how I can replace it?
Where I can buy another similar polyfuse??
Thank you
It is very rare that the polyfuse itself is the problem.
The polyfuse is self healing and can be tripped many many times. It will reset itself after several hours with no power connected.
Most of the time when the polyfuse is tripped, it is doing its job and just responding to a short circuit fault somewhere else on the board..... Preventing smoke, fire and further damage.
Unless specified otherwise my response is based on the latest and fully updated Raspbian Buster w/ Desktop OS.

gfucka
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Re: Raspberry pi b+ no led no power

Tue Sep 13, 2016 2:19 pm

klricks wrote:
gfucka wrote:Ok in the evening I do this test.
But if I verify the f1 is broken, how I can replace it?
Where I can buy another similar polyfuse??
Thank you
It is very rare that the polyfuse itself is the problem.
The polyfuse is self healing and can be tripped many many times. It will reset itself after several hours with no power connected.
Most of the time when the polyfuse is tripped, it is doing its job and just responding to a short circuit fault somewhere else on the board..... Preventing smoke, fire and further damage.
Ok this means there some other problems on my board? How can I detect this problems?

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nl3prc
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Re: Raspberry pi b+ no led no power

Tue Sep 13, 2016 4:00 pm

I say remove all devices on your USB ports and try to boot

gfucka
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Re: Raspberry pi b+ no led no power

Wed Sep 14, 2016 6:40 am

I do the measure, and I have this:

On PP1-PP3 5V
on PP7-PP3 5V
on the both side of polyfuse I have 5v
polyfuse measure in homs give me something near to 0
the continuity test on the side of polyfuse is ok
on GPIO pin 2 and 4 I have 5V
and I remove all usb device from the board and nothing happen when I put the microusb power.

The only strange measure is on 3v3 pin on the GPIO and on PP10 and PP13 because I have 0,8V but this must be 3.3V??? Is correct 0,8V or I must have 3.3V??

Thank you

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Burngate
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Re: Raspberry pi b+ no led no power

Wed Sep 14, 2016 9:16 am

gfucka wrote:The only strange measure is on 3v3 pin on the GPIO and on PP10 and PP13 because I have 0,8V but this must be 3.3V??? Is correct 0,8V or I must have 3.3V??
See the schematic, at https://www.raspberrypi.org/documentati ... /README.md, at the top in the middle for the 3v3 supply, and middle right for the LEDs
PP10 (anode of pwr LED) and PP13 (anode of act LED) won't have 3.3v if there's no 3.3v available

The 3v3 pin must have 3.3v.

Almost certainly the 3v3 supply chip or something round it has died.

gfucka
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Re: Raspberry pi b+ no led no power

Wed Sep 14, 2016 9:47 am

Thank you.
Ok how I can know what is died in the 3v3 supply chip?
Can I repair the board or I just have to trush it??

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DougieLawson
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Re: Raspberry pi b+ no led no power

Thu Sep 15, 2016 12:18 am

gfucka wrote:Thank you.
Ok how I can know what is died in the 3v3 supply chip?
Can I repair the board or I just have to trush it??
It costs about $35 to fix it. That's because you have to throw the dead RPi and spend your $35 to replace it. There are no user serviceable parts on any RPi.
Note: Having anything humorous in your signature is completely banned on this forum. Wear a tin-foil hat and you'll get a ban.

Any DMs sent on Twitter will be answered next month.

This is a doctor free zone.

gfucka
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Re: Raspberry pi b+ no led no power

Thu Sep 15, 2016 2:23 pm

Ok but I want to be sure the 3v3 supply is broken. How I can do??
Thank you so much

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Burngate
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Re: Raspberry pi b+ no led no power

Thu Sep 15, 2016 4:06 pm

If there's 5v going in, but no 3v3 coming out, then it's probably broken ... unless there's a short-circuit on its output pulling it down.
To rule that out, you could measure the impedance across its output, ... but you need to know what impedance a known good Pi has, which is where a replacement Pi comes in handy.

Even then, if you've managed to damage the SoC, by (perhaps) putting 12v onto a GPIO - maybe the SoC is pulling the 3v3 rail down, giving you the symptoms you describe.
Replacing any or all of the 3v3 supply wouldn't restore your Pi

Then again, what if it's not something on the 3v3 rail that's killed it - perhaps it's the 1v8 rail that's got the problem.
Again, replacing bits of the supply won't fix it.


One of the nice things about working in the TV industry was the ready supply of spare parts.
If a fault wasn't obviously down to one particular bit, swapping things out until it all started working was the quickest way to fix it (and speed was of the essence when the Derby runners were already on their way!)

On occasion, though, we didn't have that option.
In one situation, some Sony equipment used a Sony-designed chip that was prone to failure, so we were required to remove the offending item and return it to them for free-of-charge replacement.
Being multi-legged (somewhat similar to a SoC) that was quite difficult, and many an expletive was spoken, just to save the company fifty quid

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ab1jx
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Re: Raspberry pi b+ no led no power

Thu Sep 15, 2016 11:43 pm

What killed my 1B was a bad SD card socket. And me trying to unsolder it. It's still sitting here, I was trying to wire in one of those throwaway adapters to microsd as a replacement. This blasted high-temperature non-lead solder make me crank up my Edsyn soldering station to much higher temperature than I liked and I ended up with a short somewhere in there. They aren't easy to work on. I spent 20 years as an electronics technician, always with lead-based solder, I have no symptoms of lead poisoning, but somebody had the bright idea to outlaw it.

gfucka
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Re: Raspberry pi b+ no led no power

Fri Sep 16, 2016 6:44 am

Thank you to all for answers and sorry if I'm insistent.
But the strange is I have not done nothing to mi board, Inot connect any to the GPIO, because I use my raspberry as a mediacenter with Kodi. The only things that is appened was an electricity come and go for a strong thunderstorm. But if this is the cause why the microusb power supply not is broken?? This is the strange....

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davidcoton
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Re: Raspberry pi b+ no led no power

Tue Sep 20, 2016 8:29 am

Was an aerial connected when the thunderstorm happened? Or any other external wiring? Quite likely the SOC was fried by an electrostatic discharge, and is now pulling the 3V3 down.
As Dougie said, a repair costs $35.
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