I am afraid I must agree with Florian on both points.
The ghost images are most likely improper triggering of the oscilloscope.
And when I saw your comment about the DAC, after you described the symptoms,
I was very surprised.
Probably it's time to get some professional help with the repair.
The ghost images are most likely improper triggering of the oscilloscope.
And when I saw your comment about the DAC, after you described the symptoms,
I was very surprised.
Probably it's time to get some professional help with the repair.