DDC264: Zeros code in test mode&the influence of the length of line

Good days,TI expert.

  I porbably found a reason why I would recevie all zeros in test mode(figure1).

                                      Figure1

My partner who designed circuit missed the part of OPA350,he just connected VREF with the part pointed by the red arrow in the figure2.Or like figure3,REFOUT jumps to VREF.

                                  Figure2

                 Figure3

<1> Miss the part of OPA350 would lead to this?

<2>Now we get a new circuit board with the part of OPA350.we could get numbers in test mode(Figure4),but it's look unstable.Is that normal?

Could you show us the EVM codes in the test mode ?

                                    Figure4

<3> The codes are serveral times larger than FIgure4 shows when work in untest mode and let analog input pins float.and different channels have different magnification.So it means the length of line would effect DDC264 and increase the numbers?

And my boss want to confirm it.Could you show the codes when EVM work in untest mode without sample or let them float(don't supply voltage/power).Thanks you.

Regards,

JieYin.