I'm starting to piece together that it was likely some kind of major ground potential difference issue. He hooked up the light dimmers without a ground because the dimmers don't provide a specific ground line next to the dimmer line, and the dimmers are powered off of some power supply running from 277VAC, and my board is powered off a 120->24VAC isolated transformer where one leg is the local digital ground, and without referencing them together somehow I imagine he put some really ugly potentials on the IO pins.
On Wednesday, February 26, 2014 9:54:42 AM UTC-5, Gerald wrote: > > A schematic would be helpful/ You can send to to me direct if you like. > > Craters are definitely not good. It does sound like a IO stress issue. The > LED acting the way it sounds means the PMIC is seeing excess current and > shutting down. > > Gerald > > > On Wed, Feb 26, 2014 at 8:48 AM, <faceti...@gmail.com <javascript:>>wrote: > >> I have a device that I'm building in quantity for someone, and it has a >> simple halfwave rectifier and switching reg to provide 5V to power the BBB. >> They power it with 24VAC. >> >> I'm not sure what exactly is causing it, but they're having problems with >> the BBBs dying on them. I got one back today, and I get a single quick dim >> flash of the power LED if I plug in USB, or rapid flashing if I use the >> barrel jack. After seeing this post, I noticed that there's a burnt crater >> on the processor. >> >> I was originally thinking power problems, but now I'm starting to think >> IO misuse. >> >> These boards use primarily I2C, and the BBB is driving a couple of I2C >> peripherals for sensors and solenoid control. Additionally, I fanned out >> eight GPIO to connectors which are for future use for PWM to run light >> dimmers and switch inputs, but they're not supported yet. I just found out >> that they had the PWM lines hooked up, and I don't yet know what they had >> connected to them. >> >> >> On Thursday, July 4, 2013 10:38:46 AM UTC-4, Gerald wrote: >> >>> You have blown the processor. Request an RMA. >>> >>> beagleboard.org/support/rma >>> >>> No fuses on the board. Plugging in the USB and DC supply is totally >>> acceptable and supported. >>> >>> Gerald >>> >>> >>> >>> On Thu, Jul 4, 2013 at 3:21 AM, Will Kostelecky <will.ko...@gmail.com>wrote: >>> >>>> Help! >>>> >>>> My BBB was working fine, great in fact, but not so much at the >>>> moment. When I plug it into a power source, be it a known good 5v supply >>>> that I have been using with it for weeks, or into either of two computers >>>> via USB, I get one dim little flash from the power LED and then NOTHING >>>> else. No other lights flash. If I hold down the power switch I will >>>> get >>>> another brief and dim flash after a couple of seconds. Again, no other >>>> LEDs light and nothing else happens. >>>> >>>> This started to happen when I plugged the BBB into a computer using a >>>> USB cable while it was still plugged into the 5V power source. Could this >>>> have fried something? Are there any poly fuses that might come back to >>>> life after a rest? >>>> >>>> Frustrating as I was making such good progress on my project! >>>> >>>> Will >>>> >>>> >>>> On Tuesday, 30 April 2013 15:23:23 UTC+1, Gerald wrote: >>>> >>>>> You are a pioneer! Columbus was not looking for America. But you are >>>>> now the Columbus of the power button! >>>>> >>>>> I am trying convince the SW folks to add support for the power button >>>>> but it is down the list somewhere. >>>>> >>>>> Gerald >>>>> >>>>> On Tuesday, April 30, 2013, Jason Stapels wrote: >>>>> >>>>>> An update for the curious. After some prodding from the >>>>>> all-power-Gerald, I was able to bring the board back to life again by... >>>>>> are you ready... holding down the POWER button. Which means I'm probably >>>>>> the biggest idiot ever!? I guess I expected the PWR led to be lit any >>>>>> time >>>>>> 5V was feeding the board, regardless of it's On/Off state. >>>>>> >>>>>> Certainly, in the dozen or so previous times I plugged the board in, >>>>>> just giving it power caused it to power on, so the idea of the POWER >>>>>> button >>>>>> actually being used to turn it on never occurred to me. If I could save >>>>>> face just a little here, I did actually press it a couple times before >>>>>> throwing in the towel, I just didn't consider holding it down for a few >>>>>> seconds. >>>>>> >>>>>> In embarrassed shame, >>>>>> ~ Jason >>>>>> >>>>>> On Tuesday, April 30, 2013 8:19:57 AM UTC-4, Jason Stapels wrote: >>>>>>> >>>>>>> Hi all, >>>>>>> >>>>>>> Just wanted to share my experience with my dead BBB. It's my first >>>>>>> experience with the Beagle line so it's possible I did something wrong >>>>>>> somewhere so I thought it would be a good idea to share my experiences >>>>>>> in >>>>>>> case other newb's read this. Feel free to skip to the bottom for the >>>>>>> symptoms. >>>>>>> >>>>>>> -- Begin Background Info -- >>>>>>> >>>>>>> I was lucky enough to get my BBB almost right away from Digikey. I >>>>>>> immediately installed the drivers on my Mac and started playing around >>>>>>> with >>>>>>> it the first night. Unfortunately, the second night I couldn't get my >>>>>>> Mac >>>>>>> to allocate an IP address through the USB to talk to it so I thought >>>>>>> maybe >>>>>>> I shouldn't have skipped that "update software" step. So next I >>>>>>> downloaded >>>>>>> the latest "flash eMMC" image, wrote it to an SD card and then went >>>>>>> through >>>>>>> the upgrade process. >>>>>>> >>>>>>> Here's where things went a little South. After the first attempt the >>>>>>> USR lights eventually went solid (presumably indicating the flashing >>>>>>> process was finished) but when I rebooted it without the SD card, the >>>>>>> power >>>>>>> light would come on but it wouldn't boot. After a couple repower >>>>>>> attempts I >>>>>>> decided to flash it again. This time, at some point during the flash >>>>>>> process, the board seemed to just lose power (all the LEDs were off). >>>>>>> Attempts to power the board resulted in the same as before, power light >>>>>>> comes on but no booting. >>>>>>> >>>>>>> So, my assumption was I messed up the SD card image. I >>>>>>> downloaded/reimaged the SD card again, went through the flash process >>>>>>> and >>>>>>> this time it seemed to finish. Now when I powered on the board it >>>>>>> appeared >>>>>>> to boot up. However, I still couldn't get it to pick up an IP address >>>>>>> from >>>>>>> the Mac (after reinstalling both drivers and a couple reboots). I read >>>>>>> somewhere that someone had a similar issue and an update to Angstrom >>>>>>> solved >>>>>>> it. >>>>>>> >>>>>>> This time I plugged the board into my linux box and I was able to >>>>>>> access the running linux image (yay!). I immediately SSH'd in, and went >>>>>>> through the Angstrom upgrade (opkg update; opkg upgrade). The upgrade >>>>>>> took >>>>>>> awhile and seemed to have a few issues with the new kernel modules >>>>>>> (/lib/modules/blah didn't exist). I figured it was just a warning and >>>>>>> after >>>>>>> the upgrade finished I unplugged the board and plugged it back into my >>>>>>> Mac... >>>>>>> >>>>>>> -- End Background Info -- >>>>>>> >>>>>>> The power light came on... the USR lights all went solid for a >>>>>>> couple seconds... and then the board died. I can no longer seem to >>>>>>> power >>>>>>> the board up at all. I've tried multiple USB cables, multiple USB ports >>>>>>> on >>>>>>> multiple machines, and even tried the DC jack with a 5v/2.2A supply. :( >>>>>>> I >>>>>>> submitted an RMA (although my board doesn't seem to have a serial >>>>>>> number) >>>>>>> because I don't think I did anything wrong, but I'm a very sad panda >>>>>>> regardless. >>>>>>> >>>>>>> Any ideas? Anything I should check? >>>>>>> >>>>>>> ~ Jason >>>>>>> >>>>>> -- >>>>>> For more options, visit http://beagleboard.org/discuss >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "BeagleBoard" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to beagleboard+unsubscr...@googlegroups.com. >>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Gerald >>>>> >>>>> ger...@beagleboard.org >>>>> g-co...@ti.com >>>>> http://beagleboard.org/ >>>>> http://circuitco.com/support/ >>>>> >>>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "BeagleBoard" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to beagleboard...@googlegroups.com. >>>> >>>> For more options, visit https://groups.google.com/groups/opt_out. >>>> >>>> >>>> >>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
