No boot, LED #1 on, LED #2 lights up and then turn off

Hello, as the description said, the iMac won’t turn on, no boot chime, nothing, and it did this suddenly. I’m suspecting some logic board fault (e.g. shorted capacitor), I already have the schematic file and the .brd file. On the far right pin of the 6-pin connector from the power supply I get 3.35V and when I press the power button it goes to ground for half a second and then goes back to 3.35V. I don’t think the problem is the power supply, I get 12V-3V3-GND without problems.

Where do I have to check in the logic board?

Thanks in advance

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