lv333ming
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Raspberrypi burned

Mon Jul 17, 2017 3:30 pm

My RASPBERRY PI ZERO was burned at work. At work at room temperature at 28 ° C I wanted to know what temperature RASPBERRY PI ZERO could work for a long time without burning.

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rpdom
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Re: Raspberrypi burned

Mon Jul 17, 2017 3:41 pm

Much higher than that. It wasn't the heat that killed it.

drgeoff
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Re: Raspberrypi burned

Mon Jul 17, 2017 3:57 pm

The vast majority of RPi fatalities are caused by electrical abuse.

The GPIO pins on all models are relatively fragile in the electrical sense. They do not take kindly to receiving voltages less than 0 or more than 3.3 nor to having currents in excess of about 16 mA drawn from them or sourced by them. The resultant damage to the GPIO stage frequently spreads within the SoC converting it into a miniature electric fire. Additionally the Zero and ZeroW models have no protection whatsoever against overvoltage or reverse voltage.on the 5 volt power input points.
Quis custodiet ipsos custodes?

W. H. Heydt
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Re: Raspberrypi burned

Mon Jul 17, 2017 4:16 pm

The Pi throttles back its clock speed at 85C. A temperature of 28C (about 85F) is nothing. Yesterday, where I live, the local temperature topped out at 93F (though probably a bit cooler inside...we have some "old shade") and none of the Pis had the slightest problem. I have seen them run without issues when the ambient temperature was over 100F and one forum poster from Australia did tests with a Pi in an attic where the temperature hit 140F.

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B.Goode
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Re: Raspberrypi burned

Mon Jul 17, 2017 4:22 pm

A relatively 'official' statement is to be found here: https://www.raspberrypi.org/help/faqs/# ... emperature

So it is unlikely to have 'burnt' at 28degC

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Ronaldlees
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Re: Raspberrypi burned

Mon Jul 17, 2017 5:33 pm

Are you sure it's "burned?"

What do the LED lights do when you power it up? I had a couple Pi2 boards that looked "dead" - but brought them back to life by powering them thru the 3.3VDC GPIO pin (#1), thus bypassing the dead 5V regulator (using a separate 3.3 VDC supply, of course). That supply needs to be fused separately, as well - otherwise, no protection for the SoC.

Although - I'm not a Zero expert. I imagine the Zero is set up the same way as the Pi2 in terms of the regulator? Or not?
Last edited by Ronaldlees on Mon Jul 17, 2017 5:39 pm, edited 1 time in total.
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rpdom
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Re: Raspberrypi burned

Mon Jul 17, 2017 5:36 pm

Ronaldlees wrote: I imagine the Zero is set up the same way as the Pi2 in terms of the regulator? Or not?
Similar. No fuse. No PWR LED. The rest of the power circuit is mostly the same.

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Ronaldlees
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Re: Raspberrypi burned

Mon Jul 17, 2017 5:41 pm

rpdom wrote:
Ronaldlees wrote: I imagine the Zero is set up the same way as the Pi2 in terms of the regulator? Or not?
Similar. No fuse. No PWR LED. The rest of the power circuit is mostly the same.
Thanks for that info. I think I must have put the edit into the message (above) - for the "fuse" - about the same time as you posted your reply.
I am the Umbrella man

lv333ming
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Re: Raspberrypi burned

Mon Jul 17, 2017 10:53 pm

USB power supply I measured the PP8 PP9 2 voltage test points. Power can start to measure 3.3v 1.8v over a voltage will tend to 0v

lv333ming
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Re: Raspberrypi burned

Mon Jul 17, 2017 10:58 pm

Ronaldlees wrote:Are you sure it's "burned?"

What do the LED lights do when you power it up? I had a couple Pi2 boards that looked "dead" - but brought them back to life by powering them thru the 3.3VDC GPIO pin (#1), thus bypassing the dead 5V regulator (using a separate 3.3 VDC supply, of course). That supply needs to be fused separately, as well - otherwise, no protection for the SoC.

Although - I'm not a Zero expert. I imagine the Zero is set up the same way as the Pi2 in terms of the regulator? Or not?
Thank you I'll try your way

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