I am currently working on a MSI X470 Gaming Pro Carbon that has a weird issue: The board is working fine on startup, but after the BIOS initializes, the board shows "USB overcurrent detected" on the screen and shuts down after 15 seconds. The issue is only happening when the system is ready to boot.
What I have tried so far:
-optical inspection: no damages whatsoever
-BIOS update: The BIOS was updated to the latest stable version (I) using the CH341 1V8
-PM_OC: I checked every double mosfet (7002N) that is connected to that line. All the PM_OC-signals are on high and have the same voltage (around 3.4V)
-all resistances look okay
I got the board as defective but temporarely fixed it by resetting the CMOS as updating the BIOS to the latest currently available version (J3). After that, it was running fine for hours but suddently showed the error. I did not connect any faulty USB devices. I wonder what the issue could be? If the problem arises after initialization, the instructions for measuring the PM_OC# and showing the error on the screen must come from the BIOS, right? So they are not baked into the FCH. But as all PM_OC# are on high, could there be an issue with the FCH itself?
Thank you in advance for your suggestions! I attached the schematic of the board.
What I have tried so far:
-optical inspection: no damages whatsoever
-BIOS update: The BIOS was updated to the latest stable version (I) using the CH341 1V8
-PM_OC: I checked every double mosfet (7002N) that is connected to that line. All the PM_OC-signals are on high and have the same voltage (around 3.4V)
-all resistances look okay
I got the board as defective but temporarely fixed it by resetting the CMOS as updating the BIOS to the latest currently available version (J3). After that, it was running fine for hours but suddently showed the error. I did not connect any faulty USB devices. I wonder what the issue could be? If the problem arises after initialization, the instructions for measuring the PM_OC# and showing the error on the screen must come from the BIOS, right? So they are not baked into the FCH. But as all PM_OC# are on high, could there be an issue with the FCH itself?
Thank you in advance for your suggestions! I attached the schematic of the board.