Amiga 600 which didn’t boot.
Did some measurements on the 555 timer ic’s, and I saw the trigger threshold was too low, 1,2 Volt.
It should be some where around 2,4V. So I guessed the problem should be R611 or C611. Removed both, R611 was good, however C611 was acting like resistor of around 45K Ohm. Replaced it, and yeah, machine was booting again.