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Maker Pro

power + TFT display

On my current project I writing images to a TFT display. When the
unit is powered from the battery there is flickering and movement of
the screen in the vertical direction. There are test points on the
flex cable going to the screen and if I touch the VSYNC (for vertical
sync) point with my oscilloscope probe the screen stops bouncing and
the looks great!

When I remove the probe the flickering / bouncing continues!

Then if I plug in my A/C adapter to the unit the screen stops
flickering and looks great also!

I have tried adding more and more capacitance to the VSYNC line but
this doesn't seem to help. All the voltages going to the screen are
the same when I have bouncing, touching with the probe, and plugging
in the A/C adapter.

Any thoughts no debugging this?

Thanks.

-Mike
 
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