Hello @meliodes and welcome to the community.
In this case, there seems to be a defect in the TV. Since it is no longer under warranty, the only option is to have it repaired at a repair shop for a fee or to repair it yourself.
Since this is a very specific error, another user would have to have had exactly the same error and successfully fixed it to give you a target-oriented answer. But I'm keeping my fingers crossed that you'll get some helpful tips here.
By the way: We also have an English speaking community. https://community.medion.com/t5/English/ct-p/UK
Greeting - Andi
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