Does Raspberry Pi 3B have polyfuse? Can USB ports blow polyfuse? [duplicate]

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Does Raspberry Pi 3b have polyfuse? If it does, under what conditions can it be ‘blown’? I suspect my RPi 3b polyfuse to be blown, but I don’t know what’s causing it. I’m using an external HDD for booting into DietPi with its own power supply and after every day or so all the USB ports have no power hence RPi doesn’t boot (but boots okay with SD card).

Can someone suggest why this happens and how I can prevent this from happening again?
Also, if this keeps happening will the RPi get bricked? Thank you!pi-3powerpower-supplyboot-issuesusb-powerShareEditFollowReopenFlagedited 10 hours agoasked 13 hours agoKiran3133 bronze badges New contributorAdd a comment

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Question

Does Raspberry Rpi3B have polyfuse?

Answer

Yes, and if it is blown, you can replace it.

References

(1) If Rpi3B’s polyfuse is blown, Can I save it?

(2) Rpi3B+ Power Circuit Analysis – James Adams, rpi.org, 2018apr11

Appendices

Appendix A – Rpi Polyfuse Schematic

Appendix B – Rpi3B Polyfuse

ShareEditDeleteFlagedited 12 hours agoanswered 12 hours agotlfong013,69233 gold badges88 silver badges2222 bronze badgesAdd a comment3

The Pi3 has a 2.5A polyfuse. It will “”blow” if you pull more than 2.5A from the power supply. If you keep overloading it the fuse will eventually fail.ShareEditFollowFlaganswered 13 hours agoMilliways48.5k2323 gold badges8080 silver badges160160 bronze badgesAdd a comment