I didn't have a USB charger available so I used a general 12v 1A power supply through a premade 5v smps with a 1.5A rating and plugged it into the 5v and ground pins on the GPIO header. This worked fine for hours until this morning I VNC'd into it, it was fine. Then tried again a few minutes later and it wouldn't connect. Now the only thing I get is a dim PWR LED. I finally found a USB charger and when I use it I get nothing.
When plugged into USB the test points show 1.7v. When plugged into those pins it shows 4.9v.
F1, F2 and F3 all seem to be conducting.
Was it a mistake to plug the power into that pin? Is there anything I can do about it now, or anything I can test?
Thanks
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Vindicator
- Posts: 314
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Re: Baked my Pi
My short answer would be yes it was a mistake as the GPIO pins have no protection on them and should be buffered.
Back powering it through the USB would have been a more sound approach with some searching on the forums on how to accomplish it.
Back powering it through the USB would have been a more sound approach with some searching on the forums on how to accomplish it.
If you are more worried about ,spelling, punctuation or grammar you have probably already missed the point so please just move on.
Re: Baked my Pi
Well at this point I know something went wrong. So I'm mainly focused on figuring out what is messed up.
Is there anything I can do to locate the cause of my board acting like I described?
Is there anything I can do to locate the cause of my board acting like I described?
Re: Baked my Pi
There is nothing wrong with powering the Pi on the gpio pins, as long as you add the correct voltage. He wasn't talking about the gpio io pin's, but about it's power pins. If you touch and io pin with your 5V, that's another story as the io pins can only handle 3V3.
I would check the first supply setup to find out if it is actually producing 5V. Maybe the step down electronics failed and the 5V output became 6V or even more. In that case, it's time to order a new Pi I am afraid.
If you use the mini usb to power your Pi, you only have 1.7V on TP1 / TP2. This could mean that your adapter is bad, or it could mean that the Pi now consumes to much current. In case 2, you will have a voltage drop over the main polyfuse. If the Pi is really using to much current, you can try to figure out which component heats 2 much. Most circuits get power from the 3V3 and 1V8 power rails, so, those regulators should heat up if they need to deliver much more current. It might be worth checking if the 3V3 regulator still can deliver it's proper voltage. The pi schematics are available to figure out which regulator does what...
I would check the first supply setup to find out if it is actually producing 5V. Maybe the step down electronics failed and the 5V output became 6V or even more. In that case, it's time to order a new Pi I am afraid.
If you use the mini usb to power your Pi, you only have 1.7V on TP1 / TP2. This could mean that your adapter is bad, or it could mean that the Pi now consumes to much current. In case 2, you will have a voltage drop over the main polyfuse. If the Pi is really using to much current, you can try to figure out which component heats 2 much. Most circuits get power from the 3V3 and 1V8 power rails, so, those regulators should heat up if they need to deliver much more current. It might be worth checking if the 3V3 regulator still can deliver it's proper voltage. The pi schematics are available to figure out which regulator does what...