Problemo with MSI MPG Z790 Carbon Wifi

[Carlowsw]

Hi new member here,
I recently bought 2 motherboards for cheap. A b760 and this Z790, the problem is that there are no boarview or schematics of them and I'm just starting in this as a hobby, so I really need something to compare and know which pin is for what and where comes and goes.

Well, so I have no voltage in the Vcore phases, but I do have in the VCCG so I tried to check the datasheet about the PWM controller (which is the RAA229131) and there is nothing about it. I have the Rog Strix Z790-F Gaming boardview that has the same controller but it has a different configuration or something, because VCCG PWM is going there too when in msi goes apart.
I don't know what values should go in each pin, what should I do?

(my english is getting a bit rusty, srry)

[DynaxSC]

With MSI you are probably lucky, as they usually have a jumper named J1 somewhere in neighbourhood if the cpu vrm chip. If there is one just short it and power the board without CPU and ram. Check if there is ca 1V on VCORE. If yes, the controller and whole vrm with mosfets etc is OK. If not, there is some issue in the VRM network. Usually it is not the controller, but some issue with mosfets, low ohm resistors or drivers if present. If the VRM is OK then there is an issue somewhere else, eg. broken bios, some issue in the power sequence logic, missing parts, broken tracks, faulty or partially faulty chipset or SIO, broken DMI bus between cpu and chipset, bent cpu socket pins, shorted caps, shorted meamingful control signals, cold solder joints, etc.

BTW, the RAA.... controllers are usually programmable devices, if this fails there is practically no way to replace and program it (the configuration is very complex and can't be read out from the chip). Only real option is a programmed donor chip from same model of board. So this RAA... controllers are bad luck.

BTW it is very strange you have VCCG but no VCORE, usually it is the other way round (VCCG is usually activated later, when the IGPU has to generate a picture, or not at all if CPU has no IGPU). Maybe VCCG has its own separate controller? Or maybe there is some reason why this is so, eg. some missing part, worth to think about it.