Gigabyte B450 Aorus Pro, POSTs but immediately reboots after logo is shown

[Windows8RTMUser]

the board had some corrosion but on unimportant areas like for the led or diode to Lan port, but I have already removed those corroded components
the vCore VRMonly has 2 of 4 phases firing, at least according to my shitty dso138mini, the 2 phases that aren't firing are indirectly controlled by the isl95712 via
an ISL6625
the PWM pin from the controller to the isl6625s are at 2.4v, ie the idle state
so far I have not found any broken traces or resistors for the vCore circuit

I have flashed both bios chips to latest firmware

I have replaced:
- all oscillators, 2x 32khz, the 48mhz CPU, and the 25mhz for the chipset
- VRM controller

Still no change apart from the older bios revisions would get to the settings screen and skip the logo before restarting again

[lezsimply]

You can check the temp of both pwm and driver ic during startup (after pressing power button) You need to know if pwm controller goes more than 45c. If it does you need to check around pwm. Or you can check how much current is drawn. I had a board with this issue, after pressing power button pwm soars up to 82c causing it to shutdown right after logo. This is just based on my experience.