The PSUs (several good PSUs tried) act as the 12v CPU Line is shorted - PSUs start and stop right away and second try through pwbtn is impossible unless psu off-on first. When CPU line not plugged PSUs run normally. This happens only when cpu line plugged. The mosfets are not shorted. Tested every single one of them between drain and source - high side mosfets - 1.3megaohm, low side - 100ohms. Between 12v and ground on the cpu connector - normal capacitor rise from ohms to about 1megaohm. All measurements are without a cpu (btw I tried with 2 different cpus - same result).
So I suspect the drivers/pwm to be the problem - can they make such problem that one or more mosfets act as shorted. How to test drivers and pwm? Also - can I inject voltage( what volts) in them and where exactly?
So I suspect the drivers/pwm to be the problem - can they make such problem that one or more mosfets act as shorted. How to test drivers and pwm? Also - can I inject voltage( what volts) in them and where exactly?