Just to keep this up to date:

Finally Philips opened a new case for the TV... Home repair service twice, power supply and Mainboard changed, of course nothing happened. (everybody thinks this is a software problem)

Now they have it in their service center, almost 10 days and tell me they keep checking it - just ridiculous cause they know the problem and it is easy reproducable. And of course I cant get a TV for the repair time, so the consumer is the looser again.

I really start to think about buying Philips products ever again...and about informing my lawyer.