Code: Select all
Code: Select all
sudo shutdown -h now
Yes it does. The USB power lines are connected directly to the incoming 5V. The USB power lines should not be connected to the USB power supply, but they often are. So the two power supplies were both trying to set the voltage level at different levels, like two people trying to fill the same bath to different levels. The Pi Supply had the tap full on, and the USB supply had the plug out and was bailing hard. That caused the input current to rise, and eventually caused the USB supply to die.Wisar wrote: the 5v supply for the USB hub was completely dead. It also turns out that the power supply that I have been using with the RPi is delivering 5.4v which is above what the RPi would like to get. This doesn't explain the USB hub power supply going out
Yes; The version 1.0 boards need to be modded to work with back-power. You have to bridge at least one of the USB polyfuses. Rev 1.1 and later (ver 1.1's replaced the USB polyfuses with 0ohm resistors, version 2.0's have no polyfuses at USB) back-power just fine.Wisar wrote:Thanks Lob0426. One of my RPis is meant to be driving a little tracked 'bot and I am actually powering it from the hub in that instance. I blew this one up while messing around with some hardware on the test bench where I have been powering both the hub and Rpi separately. I think I read somewhere that you were not supposed to be able to power the RPi from the hub but I guess that might have been for version 1 incarnation per a post in this thread. I guess the trick will be to make sure that my chosen hub can deliver the power the RPi needs as it is extremely finicky!