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thanks for the support.
I checked this again and both sinks are cold after 5 minutes on. Only 2 small sinks on the y-buffers get warm. I checked all fuses and the the electrolytics look ok. I should mention that the picture with the red dots appears every second for a short time. So I took 20 pictures to capture this.
Yes. Cold. For sure. Maybe the problem is the logic-main. But the green LED2010 is on and the LED2011 is blinking. According to the service manual this means the board is ok.
these are my test results so far.
- removed upper Y-buffer:
a few pulsating dots in the lower half of the screen
- removed lower Y-buffer:
no more pulsating, just grey horizontal stripes in the upper half
I didn't remove the lower E and F-buffers yet, because of the many sensitive flat-cables. Can it be, that just single defective Y-buffer causes the whole panel to fail?