I would start by having 3-D X-Ray of the solder balls under the main processor chip, to look for shorts, solder bridges and open ball connections.
Simple vertical X-ray will not always tell you what you need to know. --- Graham == On Thursday, July 16, 2020 at 4:10:53 AM UTC-5, Wapeul wrote: > > We made the board with the open source of Pocket Beagle. > https://github.com/beagleboard/pocketbeagle > > We made a total of five. > Only one of them works, and four do not. > I don't know the cause. > All pin maps have the same voltage. > The voltage of EMU0 (CDN of SD card connector) is 3.3V for normal board > and 0V for abnormal board. > > > > How to solve it? > What do we need to check? > > Best regards > CH Cho > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/fa7087c3-1af9-4815-be00-f71301589e95o%40googlegroups.com.
