Sound like the monitor is out putting 5V on the HDMI connected. Not good. Violates the specification.
Try removing RT1 from the board and see if that helps. Gerald On Thu, Oct 10, 2013 at 7:22 PM, shedmeister <[email protected]> wrote: > Gerald, > > I finally got back to this. The monitor is a 7" Lilliput 669gl. I > checked SYS_5V as you suggested. It is 4.81V when the BBB is off, the > monitor is off, and the monitor has DC power connected (so the monitor's > power supply is powering part of the BBB). If I then turn on the BBB, it > doesn't boot, and SYS_5V stays at 4.81V. If I then turn on the monitor, > SYS_5V goes up to about 4.9V and it boots. > > Case 2: Turn on monitor first. SYS_5V drops down to about 4V, then > gradually climbs back up to 4.81V over a period of about 5 seconds. During > that 5 seconds, the monitor has gone to standby (after reporting no > signal). Turn on the BBB and it does not boot. > > Case 3: Turn on monitor first, power up BBB during the short window when > the monitor is displaying "no signal" and SYS_5V is climbing from 4V. In > this case SYS_5V jumps up to 4.9V, the BBB boots, and everything works > great. > > Case 4: Disconnect DC power from monitor - boots fine. > > Case 5: Disconnect HDMI cable - boots fine. > > Thanks, > Jim > > > -- > 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.
