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(I have to check which board i have) Moment please

So it pulsates as soon as it gets power. I don't press any power buttons - the logic board is lying naked on the table. The MagSafe plug first turns green then red. I don't have any fan spin...

Hello community, I have a MacBook Air 820-00165 with an i5 and 8GB Ram. The logic board doesn't want to start. I've taken some measurements but I can't really get any further.

And please excuse me if something is spelled wrong, I have to use a translator.

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PPBUS_G3H = 8.6 V (stable)
PP3V42_G3H = 3.44 V (stable)
First Always/SMC signals
SMC_RESET_L = 3.4 V (stable → SMC running)
SMC_PM_G2_EN = pulses between 0 V ↔ 3.3 V
PM_PWRBTN_L = pulses between 0 V ↔ 3.3 V
PM_SLP_S5_L = pulses between 0 V ↔ 0.2 V
...