Saeco Minuto HD8761/01 can not be switched on

Hello
I have a problem with a HD8761. Although the ON/OFF button flashes red in its normal rhythm, the machine cannot be switched on.

Hold the upper left and lower right buttons to enter test mode. However, as soon as I press the ON/OFF button, the display does not jump any further as if the button was defective.
But by measuring this probe I had to find out that the probe is OK. Bridging the button also did not bring success, the test mode has not changed in the menu navigation.

Oxidation, burned or bloated components, I could not recognize them from the display or power print. Visually, both boards appear in perfect condition.

My question to the professionals here, is it already possible to deduce here whether the display board or the power electronics are defective?
Or do you need more trade fairs?
Can I use another Saeco Minuto power electronics or display print, e.g. the HD8762/01?

I would appreciate your help.
Best greetings from Hamburg

Saeco Minuto (HD8761)

Victory,
for the interested among you. Problem solved, it runs again.

I bought a complete Saeco Minuto today and replaced the display electronics and now the machine is working again.
Apparently the conductor is interrupted somewhere on the circuit board.

If someone has the control unit lying around, we could do business.

Best regards from Hamburg