If that was the situation it definitely could have caused an issue. Gerald
On Wed, Feb 26, 2014 at 5:41 PM, <[email protected]> wrote: > 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, <[email protected]> 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 >>>> <[email protected]>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 [email protected]. >>>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> Gerald >>>>>> >>>>>> [email protected] >>>>>> [email protected] >>>>>> 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 [email protected]. >>>>> >>>>> 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 [email protected]. >>> 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 [email protected]. > 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 [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
