BBB stopped working, won't power up.

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1

I was working on running a shift register, had P8_07 through P8_10 hooked up to the DATA, LATCH, CLEAR, and CLOCK ports of a 74LS164, then a couple of the outputs over to a ULN2803 to run LEDs. I’m not sure when it died, it had lights on when I moved over to the Cloud9 browser, then when I couldn’t get a response from Cloud9 after some coding, it was black.

I’ve been using a 5V bench supply but I’ve tried it with the USB plug, and a wall wart running 5V. All I get is a quick flash on the power LED and then blank. If I hit the Power button, the LED flashes for a split second again, then blank. I’ve taken out the SD card, removed the wireless mouse dongle, nothing. Hold down the power or boot buttons and plug in, nothing.
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I can’t see any burned components, nor do I smell anything burned on the board. Is it done for, and did I do it, given that fairly innocuous circuit?

2

Sounds like you popped something. RMA is your best option. http://beagleboard.org/Support/RMA

Also check http://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Usage to make sure you followed the rules for using the expansion headers.

Gerald

3

I’m completely willing to take responsibility, but would connecting the logic directly to the pins I describe on a 74LS164 overvoltage the header? As far as I can tell, it should just take the High from the pins and drain to the GND on the chip.

4

I can’t say. I would need to see a schematic of how it was all wired up.

Gerald

5

http://imgur.com/LOe2NAQ

+5V and GND into each IC.

6

Well, considering the voltage of the I/O is rated at 3.3V max, I would say the processor is most likely destroyed.

Gerald