sjackjack
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Pi 3 at 80 Celsius with no load (dead?)

Thu Jul 26, 2018 5:20 pm

Ok guys.. i need your help!, i've noticed in the last few days some random reboots when execute a python code.. today i've touched the pi and was very hot! The temperature after the boot was at 80 Celsius with no load, i've not heat sink over it but i know it is useless now becouse i' m sure it is an hardware damage.. (maybe caused from a short circuit..), when execute some code it goes up to 90 Celsius.. and still when it is power off and connected to the power supply it is very hot (it is very hard to keep the finger over the cpu) Now is there any suggestion?

drgeoff
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Re: Pi 3 at 80 Celsius with no load (dead?)

Thu Jul 26, 2018 6:39 pm

It is only a matter of time until it ceases to execute any code. Replacement is the only cure.

They don't normally die for no reason. What have you been doing to it?

Heater
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Re: Pi 3 at 80 Celsius with no load (dead?)

Thu Jul 26, 2018 6:46 pm

I'm very sure that running Python code on your Pi will not kill it.

Either you are very unlucky and have a bad Pi or there is more to this story than you say.

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DougieLawson
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Re: Pi 3 at 80 Celsius with no load (dead?)

Thu Jul 26, 2018 7:27 pm

if you run a python while True: loop without an time.sleep() in the loop body you're going to run flat-out on at least one engine and that will make your RPi run hot.

So post your code so we can see where you're burning the CPU.
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davidcoton
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Re: Pi 3 at 80 Celsius with no load (dead?)

Thu Jul 26, 2018 8:08 pm

sjackjack wrote:
Thu Jul 26, 2018 5:20 pm
. (maybe caused from a short circuit..)
That may be significant, and would account for the overheating.
Did it work at any time with the code you are now trying?
Does it overhaet from startup if your code is not running?
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drgeoff
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Re: Pi 3 at 80 Celsius with no load (dead?)

Thu Jul 26, 2018 8:52 pm

davidcoton wrote:
Thu Jul 26, 2018 8:08 pm
Does it overhaet from startup if your code is not running?
The opening post contained these words: "when it is power off and connected to the power supply it is very hot (it is very hard to keep the finger over the cpu)"

As McCoy (never?) said "He's dead, Jim".

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davidcoton
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Re: Pi 3 at 80 Celsius with no load (dead?)

Thu Jul 26, 2018 8:56 pm

drgeoff wrote:
Thu Jul 26, 2018 8:52 pm
davidcoton wrote:
Thu Jul 26, 2018 8:08 pm
Does it overhaet from startup if your code is not running?
The opening post contained these words: "when it is power off and connected to the power supply it is very hot (it is very hard to keep the finger over the cpu)"
So presumably after the code has been running and then the Pi is shut down.
Hence my carefully worded (if misspelt :oops: ) question about what happens from (cold) power-up WITHOUT running the possibly problematic code.
I don't expect it to be any different, but if it is, the source of the problem is different. Possibly. YMMV. :?
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wildfire
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OT...

Thu Jul 26, 2018 9:42 pm

drgeoff wrote:
Thu Jul 26, 2018 8:52 pm
As McCoy (never?) said "He's dead, Jim".
Off topic but relates to my sig.

Bones did say that. ;)
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sjackjack
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Re: Pi 3 at 80 Celsius with no load (dead?)

Sun Aug 05, 2018 7:48 am

sorry guys if i replied so much late
drgeoff wrote:
Thu Jul 26, 2018 6:39 pm
What have you been doing to it?
i have used it to control an eletric scooter , and the 1kW motor and the pi had the same ground with out electrical isolation ( mine fault), and moreover the gpios was connected to an home made board with probably a short circuits ( i din't to it).
davidcoton wrote:
Thu Jul 26, 2018 8:56 pm
drgeoff wrote:
Thu Jul 26, 2018 8:52 pm
davidcoton wrote:
Thu Jul 26, 2018 8:08 pm
Does it overhaet from startup if your code is not running?
The opening post contained these words: "when it is power off and connected to the power supply it is very hot (it is very hard to keep the finger over the cpu)"
So presumably after the code has been running and then the Pi is shut down.
Hence my carefully worded (if misspelt :oops: ) question about what happens from (cold) power-up WITHOUT running the possibly problematic code.
I don't expect it to be any different, but if it is, the source of the problem is different. Possibly. YMMV. :?
the problem is not the code itself, becouse i have formatted the sd card and after the start up the temperature reach 80+ °C easy peasy, i have added a heat sink and a little fan, and with anything open after a fresh start up, the temperature is keept under 70 °C Of corse i don't use it anymore becouse i don't want to trigger a fire( i use an original power supply and at the begging of the project the temperature was a normal 40/50°C ), but is very hearth breaking to throw it in the bin. So an help would very appreciated if there are other solution then throw it away. Is there too much dangerous to use it with a good dissipator? when i could, i will check in the lab the absorbed current

wildfire
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Re: Pi 3 at 80 Celsius with no load (dead?)

Sun Aug 05, 2018 5:09 pm

If you've tried another uSD card with a fresh image of latest Raspbian and it's still hitting those temperatures with nothing else connected (or running) then your Pi is fried.
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mosespi
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Re: Pi 3 at 80 Celsius with no load (dead?)

Sun Aug 05, 2018 7:01 pm

Preliminary CPU/SOC damage test.. power up your Pi with the SD card REMOVED. If the CPU/SOC is uncomfortably hot to the touch, it's damaged.

Regards,
-Moses
Power problems? MoPower UPS for the Pi
http://www.allspectrum.com/mopower/

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Imperf3kt
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Re: Pi 3 at 80 Celsius with no load (dead?)

Sun Aug 05, 2018 8:53 pm

Another test: use a multimeter set to continuity, to test between pins 2 or 4 and any ground point (any metal on the Pi, pin 6, pin 39, etc)
If your multimeter beeps, the Pi is indeed irrepairably damaged.

BE SURE TO ONLY PERFORM THIS TEST WITH THE PI OFF AND UNPLUGGED, otherwise, if the Pi isn't dead, it will be after, and possibly your multimeter too.
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sjackjack
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Re: Pi 3 at 80 Celsius with no load (dead?)

Sun Aug 05, 2018 9:49 pm

thanks you guys, i will try

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