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Echos/shadows on ADV7842 Eval kit

Question asked by JeffMcD on Jun 29, 2011
Latest reply on Jun 29, 2011 by DaveD

Using a "transient response" test pattern, I am seeing echoes/shadows as shown on the attached photo. The black rectangle with the crossing lines is supposed to be there - the grayish rectangle to the right is not. (The other artifacts can be attributed to using a camera to capture the image)


  • This image was taken at VGA 1920 x 1080. It is worse at VGA 1600 x 1200, better at lower resolutions
  • It can be masked using the Bandwidth filter at the sacrifice of image quality.
  • It can also be masked by changing the brightness and contrast.
  • I am using the Quantum Data QD780 as the source.
  • I have tried 3 different cables - all look the same.
  • Connecting the QD780 directly to a monitor does not show the shadow
  • I have connected the Eval kit to several different monitors and the image looks the same.


Any ideas?