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Raspberry Pi 3 B+ Short Circuit

ibrahimgarip

Hey i got a new raspi almost 1 week ago and yesterday I try to add cooler fan.

Fan was working 5V and think i can get from pinout. when i was a connect, raspi was restart.

I try again when its open ( Wish i shouldnt image)  and bom, raspi gone. Its not working anymore. Only red light and nothings happening.

I think maybe it can be a short circuit and i measure with multimeter the polyfuse its 0 ohm without power, 0.13 Ohm on power.

I change the sd card and software.

But nothings happened.

What can i do ?

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  • Under normal circumstances, if you connect a fan to the 5V of the pi, that should work. The thing is, that this 5V is directly connected to several internal circuits on the pi. So if you apply an external "very different from 5V" voltage on it, things might break.

     

    What I THINK may have happened is that you accidentally also unconnected the fan. The fan is an inductive component and will produce large voltages when you suddenly disconnect it from the power supply.


    Even when only trying to make a connection you might accidentally make and then for a short while break the connection again. Contact bounce (normally refers to switches).

    So if you do this again, only connect and disconnect when the power is not applied.

  • in reply to rew

    Good catch - I didn't even think of that, but definitely sounds like a plausible explanation as well! I guess whether that happens in practice will depend on whether the capacitors across the power rail and the regulation of the power supply can arrest or dampen the spikes sufficiently or not.

     

    - Gough

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  • in reply to rew

    Good catch - I didn't even think of that, but definitely sounds like a plausible explanation as well! I guess whether that happens in practice will depend on whether the capacitors across the power rail and the regulation of the power supply can arrest or dampen the spikes sufficiently or not.

     

    - Gough

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