I came to the same conclusion a few days ago. This is going beyond my capabilities.
I don´t like to give up, but I´m affraid I will damage the BM if I continue soldering and resoldering components.
Will leave it the hands of an expert and when the fault in this Beomaster is found, I will post it (this may take a few months).
I want to thank the people who tried to guide me to a solution, their remarks are highly appreciated.
Hans.