After a lot of frustration, I have finally got my HDMI to VGA adapter
working. At first I got a very inexpensive adapter from Meritline. I
could get the initial splash screen, but then nothing. Then I got a
recommended adapter and cable that cost twice as much. I could get the
initial screen for a few minutes, but then it disconnected.
Reading a post on Sparkfun, I realized that the adapter was pulling too
much current through the Beaglebone. I touched the capactors next to the
HDMI port, and they were very, very hot just before the VGA monitor lost
connection. So I took the adapter apart to find where the 5 volt power was
coming in. A little checking and I found which pin supplies the 5 VDC to
the HDMI cable. I traced the pin out to the adapter circuit board. Then I
cut that wire and soldered a wire onto it. I ran that wire to the
Beaglebone circuit board where the barrel connector connects power in. I
connected the wire up, powered up the board, then powered on the VGA
monitor, and everything works like a charm now! The Beaglebone Black just
can't supply enough 5 volt current to run the adapter, so it needs to be
powered directly from the 5 vdc source.
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