I finally found the bad connection. Thank you very much...

.... any help

Hello. There was a liquid contact on the MS-16R81 2.0 board, and after resolving all the issues, the device doesn't trigger the start button. However, after removing the RTC battery, the device starts automatically and everything is fine. There's no voltage on the start button and there's a missing resistor. I saw that there's no connection between the start button and the EC (IT557VG-128), meaning between the button and GND (2 mega ohms). Since the IT557VG-128 is a BGA, I don't know where to find the correct path. I checked the button and the EC using diode mode, but I couldn't see any connection....