diogenes
Posts: 1
Joined: Thu Dec 20, 2012 2:10 am

Board dead after a few minutes

Thu Dec 20, 2012 2:37 am

So, my board arrived, I was planning to just experiment with it as a media center running XBMC. I got a 5V 1.2A charger, tested the board with nothing else plugged and the red led was on. Got a 2gb SD, downloaded and installed the raspbmc image to it, plugged the network cable to my router, I wasn't in the mood to get the TV, so I used an USB video capture device and the RCA video output with the computer.

With all set I powered it on. I didn't pay attention to the leds, but I got the rainbow splash screen stuck. I realized I forgot the keyboard, powered it off, got the keyboard, plugged it, powered it back on, and the board seemed dead. The red led would turn on, but nothing else. I unplugged everything, tested the supply voltage, still on 5V, but strangely, the 5V GPIO output was down to 3.6V, and the 3.3V was down to 2.2V. I noticed the F3 fuse was very hot, unplugged power and measured it to 2.6 ohm. After about 1 hour I plugged it back on and measures the fuse voltage drop, almost 2V! Also, not even the red led turned on. After a few minutes I tried again, the red led gave a faint light and went dead again.

Any ideas on what to do, or is there any clear sign that my board is dead? From what I read around the forum, the red led shouldn't be always off even if the fuse or the 3.3V regulator is blown. Should I leave the board for a while for the fuse to reset? Power using the GPIO?

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daremick
Posts: 11
Joined: Mon Dec 17, 2012 5:09 am

Re: Board dead after a few minutes

Thu Dec 20, 2012 3:49 am

Here are some other threads on this site explaining the polyfuse and power issues. I hope they help.

http://www.raspberrypi.org/phpBB3/viewt ... 24&t=25910

http://www.raspberrypi.org/phpBB3/viewt ... se#p237576

http://www.raspberrypi.org/phpBB3/viewt ... se#p237294

apparently the polyfuse is an issue for many people causing crashes, failed or no boots, no LED or dim LED, low readings, etc. check them out and see if any of the fixes these guys offer works for you. Best luck, and you always have the warranty if nothing else.

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daremick
Posts: 11
Joined: Mon Dec 17, 2012 5:09 am

Re: Board dead after a few minutes

Thu Dec 20, 2012 3:51 am

diogenes wrote:Should I leave the board for a while for the fuse to reset? Power using the GPIO?

actually I forgot to mention I think the second link i posted for you describes in detail how to power using the GPIO but at your own risk you WILL be bypassing the protection on you board from overcurrent.

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