Debugging PC motherboard that won't power on

[dorkshoei]

Are there any good tutorials that focus on debugging PC motherboards that won't power on?

If I jumper the PSU-ON all PSU voltages are good (obviously no load).   I have 3V power to the on/off switch pins on the motherboard.  I've cleared NVRAM,  reseated RAM,  tested the RAM in another machine,  reseated the CPU but it won't power on.

[PKTKS]

short answer = NO

no tutorial will really help... although dozen of  "courses"  will put a mosaic of knowledge in front of you.

Long answer = not even with these mosaic of tips you have a direct path...

Reason being .. the  MOBOs changed too much ...
You need the bare bones of each "class"

For example a couple common reasons of failing boot:
-  Bad or corrupted BIOS and/or firmware
- Firmware today lies into "parts" - even the Super I/O on some mobos on some models has firmware
- Bad power rails - the advent of iGPU made the PDU (power distribution) on mobos change a lot
- from simple sparse regulators to complex multiphase VRMs .. you just need to check them BEFORE powering a bad mobo..
- Corrosion - and that comes with air flow.. and that can ONLY really be spotted with microscopes and some practice..

bottom line you will need also
- some minimum schema of the mobo - VRMs can be complex
- o GOOD BIOS POST CARD..  although these UEFI based boards can mess up a lot..
- some good de soldering tools..

no jump start really

Paul