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TPD12S521 HDMI problem

Other Parts Discussed in Thread: TPD12S521

Hy!

We are using an TPD12S521 with an Imx6 cpu. The problem is that sometimes the picture blacks out for examle after with move the cursor and then it reappreas.

Unfortunately we use 2 layer PCB for economic purposes. I know that diff impedance is barely met (about 130Ohm).

Could this be the problem since it is cousing ringing on the lines back to the source?

Or maybe not enough gnd on the imx gnd pin side? god knows...

I am pretty sure with 4 layer it would be seamless theoretically

Here is a snapshot:

Diff lines are 0.5 m wide with 0.2 gap.

Maybe some overcurrent stuff caused by ringing.

Thank you for letter in advance,

Andrew