Power off
MK-2014-02-12 note:
I found 3 defect capacittors (10v 2200 µF), named C 206, C 202 C and C 217 ... (see picture) ...
and replaced them with 16v 2200 µF.
And then the TV worked again for a while (15 min), so it was not enought!
I then replaced C 218 (10v 2200 µF) with 16v 2200 µF.