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AD9705 DAC Failure


I'm currently using the AD9705 in conjunction with the ADA4430-1 for a video design project. The design works. However, After a few months of field trial , several units came back without video. I measured all the signals going into the DAC and they all present. There is no short circuit, missing parts, and all the voltage rails are present.

When i measured the output of the ADA4430-1 and AD9705 ICs there were no video signals at either of the outputs.  All the logic signals are at the correct state.

If i swap out the video board there is video.

I'm unable to determine the what causes the AD9705 and ADA4430-1 to fail.