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ADV7441A HDMI input low contrast and brightness problem

Question asked by zowietek on Dec 25, 2017
Latest reply on Jan 2, 2018 by Payam

This is an existing design. The contast and bightness of HDMI video input decreased after go through ADV7441A. We noticed this problem for a while without solution. We tried turn off CP AGC and tune the contrast and brightness but result is not very good. Any help will be appreciated.

 

Refer to above image, left is original, right is after ADV7441A. It is easy to see that white characters turns gray, bright green line turns dim. The sharpness of whole image gets soft.

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