Hey Janice,
thank you for your thoughts.
1) I do not know who made the cable. I bought it with the used rig. It worked well for the past time...
2) Yes, I can read a multi-meter and so on.
3) May it become a problem when the rig sends 24 volts and there is a battery on the monitor when it is turned off?
4) Do you have an idea where to get the wiring info? I can not find more then the connector pin info, but I do not know what is inside the post...
6) I'll do my very best and I really want to understand what happened.
7) Should I replace the cable? I checked it with the multi-meter, but everything looks fine.
8) I also opened the monitor and searched for the damaged area. When I remove the HDSDI-module, the buttons react and I can change the source and so on, but the screen stays black.
Thank you so far!