The Power Jack is ok.

Not that I don't trust your assessment here, but ow do you know it's okay? I had the leaf switch problem Bitt is referring to and it's different from the buffer chip problem, so the symptoms might not be the same. Is there any way you've been able to test to verify that the leaf switch is definitely not making contact, thus forcing your player into DC mode? From just looking at it, I was never able to tell.

Edit: That's it, Fabris, I quit.