We are performing a board bring up on a new design using the ADV7611. With this part we are receiving HDMI video and outputting 24-bit RGB from the CMOS. The HDMI input is detecting correctly, but as we were checking the outputs we noticed that the LLC output is swinging between -3V to 5V. The other sync signals HS, VS and DE all seemed normal at 0V-3.3V se we can't explain this. Also, the measured frequency of the LLC is what we would expect for the 720p60 input.
So far we have tested multiple boards and they are behaving the same. Below is a screen shot that shows our scope capture. We checked the scope against its reference clock to verify the probe was accurate and then re-tested the LLC. I have also tried lowering the drive strength, but this had no affect.
Should this signal be 3.3V like the other syncs?