@Pakmann thanks. we are all volunteers here, so we now have to find someone that has time and cares to find and fix the problem and propose a working solution back to the project. but its on the list of issues.

Ahh… so simpel -.- works. Thank you

hmm… it looks like my system is broken. npm makes a lot of problems too. I decide to reset the systems completely. Fresh OS and a new MM installation. It was easier as to find the root cause. Now everythink is running up again. Thanks a lot for your ideas and your help

I offered the Hardware 4 weeks ago. I think too, that cec is Not supported on the lcd Controller Board. I think i will solve my Problem wird a relais between controller board and Display. I can control the power supply for the display with the relais over pi. Not pretty, but it should works simple