I'll have to pull it out and take a look again.  I believe it was the power rail for the touch driver.  I tried to take a screenshot on the oscope, but couldn't do it quickly so I gave up. 

On Thu, Mar 8, 2012 at 4:49 PM, James <angweiyang@gmail.com> wrote:

On Wed, Mar 7, 2012 at 2:33 AM, Stephen Farnsworth <robotoman@gmail.com> wrote:
> It is the LG screens.  There is a bad board design and there seems to be
> around +-1V high frequency noise at the touch device controller on the
> chestnut boards according to my o-scope.  I've given up for now, and am now
> banging my head on other gumstix things...

Can you point out the test points where you observed the noise?

I would like to see for myself too since I too have the same issue
with my Chestnut+LG setup.


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