[ruelnov]

For serious motherboard work, you need a POST Diagnostic Card that plugs into PCI or ISA slot. You also need an ESR Meter to test capacitors on board, not the usual digital voltmeter.

Then you need accurate and deep low-level hardware diagnostics software for you to test the functionality of every mainboard component, plus a burn-in test software.

And to complete the rig, you need an EEPROM Programmer and spare BIOS chips so you can reprogram any dead BIOS chip. About 50% of dead mobos have problematic BIOS firmware or BIOS chip.

Then keep an open mind so you can learn new things and join international forums dedicated to motherboard hardware and repair, BIOS, etc.

Lastly, be prepared to invest substantial time and effort to apply what you have learned from others or discover new tricks in motherboard repair.