When you turn on the analyzer, it accepts any parameter of amplitude, span or frequency that are quickly entered. However, at 3 or 4 seconds after switching on...the entire grass line "goes up" and jump to the top of display. It endeed compressed as a single line you still can see, so as you don´t have a normal display image it is not possible to run any diagnostic routine.
Not an expert with the rig, I was reading the service guide at assembly level repair to arrive at an indicative conclusion. There is some examples of common troubleshooting video problems, but not this case. I can see the video is processed at A16 module, but not sure if A2 display module is involved too.
Any guideline or comments will be appreciated.